c001374636
C++20 introduced `contains` member functions for maps and sets for checking whether an element is present in the collection. Previously `count` function was often used in various ways. `contains` does not only express the intend of the code better but also does it in more unified way. This commit replaces all the occurences of the `count` with the `contains`. Tests: unit(dev) Signed-off-by: Piotr Jastrzebski <piotr@scylladb.com> Message-Id: <b4ef3b4bc24f49abe04a2aba0ddd946009c9fcb2.1597314640.git.piotr@scylladb.com>
2223 lines
106 KiB
C++
2223 lines
106 KiB
C++
/*
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* Copyright (C) 2018 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "database.hh"
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#include "sstables/sstables.hh"
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#include "sstables/sstables_manager.hh"
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#include "service/priority_manager.hh"
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#include "db/schema_tables.hh"
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#include "cell_locking.hh"
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#include "mutation_fragment.hh"
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#include "mutation_partition.hh"
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#include "utils/logalloc.hh"
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#include "sstables/progress_monitor.hh"
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#include "checked-file-impl.hh"
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#include "view_info.hh"
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#include "db/data_listeners.hh"
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#include "memtable-sstable.hh"
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#include "sstables/compaction_manager.hh"
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#include "sstables/sstable_directory.hh"
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#include "db/system_keyspace.hh"
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#include "db/query_context.hh"
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#include "query-result-writer.hh"
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#include "db/view/view.hh"
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#include <seastar/core/seastar.hh>
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#include <boost/range/adaptor/transformed.hpp>
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#include <boost/range/adaptor/map.hpp>
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#include "utils/error_injection.hh"
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#include "utils/histogram_metrics_helper.hh"
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static logging::logger tlogger("table");
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static seastar::metrics::label column_family_label("cf");
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static seastar::metrics::label keyspace_label("ks");
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using namespace std::chrono_literals;
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// Filter out sstables for reader using bloom filter
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static std::vector<sstables::shared_sstable>
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filter_sstable_for_reader_by_pk(std::vector<sstables::shared_sstable>&& sstables, column_family& cf, const schema_ptr& schema,
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const dht::partition_range& pr, const sstables::key& key) {
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const dht::ring_position& pr_key = pr.start()->value();
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auto sstable_has_not_key = [&, cmp = dht::ring_position_comparator(*schema)] (const sstables::shared_sstable& sst) {
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return cmp(pr_key, sst->get_first_decorated_key()) < 0 ||
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cmp(pr_key, sst->get_last_decorated_key()) > 0 ||
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!sst->filter_has_key(key);
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};
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sstables.erase(boost::remove_if(sstables, sstable_has_not_key), sstables.end());
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return sstables;
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}
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// Filter out sstables for reader using sstable metadata that keeps track
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// of a range for each clustering component.
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static std::vector<sstables::shared_sstable>
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filter_sstable_for_reader_by_ck(std::vector<sstables::shared_sstable>&& sstables, column_family& cf, const schema_ptr& schema,
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const query::partition_slice& slice) {
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// no clustering filtering is applied if schema defines no clustering key or
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// compaction strategy thinks it will not benefit from such an optimization,
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// or the partition_slice includes static columns.
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if (!schema->clustering_key_size() || !cf.get_compaction_strategy().use_clustering_key_filter() || slice.static_columns.size()) {
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return sstables;
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}
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::cf_stats* stats = cf.cf_stats();
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stats->clustering_filter_count++;
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stats->sstables_checked_by_clustering_filter += sstables.size();
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auto ck_filtering_all_ranges = slice.get_all_ranges();
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// fast path to include all sstables if only one full range was specified.
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// For example, this happens if query only specifies a partition key.
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if (ck_filtering_all_ranges.size() == 1 && ck_filtering_all_ranges[0].is_full()) {
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stats->clustering_filter_fast_path_count++;
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stats->surviving_sstables_after_clustering_filter += sstables.size();
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return sstables;
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}
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auto skipped = std::partition(sstables.begin(), sstables.end(), [&ranges = ck_filtering_all_ranges] (const sstables::shared_sstable& sst) {
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return sst->may_contain_rows(ranges);
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});
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sstables.erase(skipped, sstables.end());
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stats->surviving_sstables_after_clustering_filter += sstables.size();
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return sstables;
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}
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// Incremental selector implementation for combined_mutation_reader that
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// selects readers on-demand as the read progresses through the token
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// range.
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class incremental_reader_selector : public reader_selector {
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const dht::partition_range* _pr;
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lw_shared_ptr<sstables::sstable_set> _sstables;
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tracing::trace_state_ptr _trace_state;
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std::optional<sstables::sstable_set::incremental_selector> _selector;
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std::unordered_set<int64_t> _read_sstable_gens;
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sstable_reader_factory_type _fn;
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flat_mutation_reader create_reader(sstables::shared_sstable sst) {
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tracing::trace(_trace_state, "Reading partition range {} from sstable {}", *_pr, seastar::value_of([&sst] { return sst->get_filename(); }));
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return _fn(sst, *_pr);
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}
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public:
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explicit incremental_reader_selector(schema_ptr s,
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lw_shared_ptr<sstables::sstable_set> sstables,
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const dht::partition_range& pr,
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tracing::trace_state_ptr trace_state,
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sstable_reader_factory_type fn)
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: reader_selector(s, pr.start() ? pr.start()->value() : dht::ring_position_view::min())
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, _pr(&pr)
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, _sstables(std::move(sstables))
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, _trace_state(std::move(trace_state))
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, _selector(_sstables->make_incremental_selector())
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, _fn(std::move(fn)) {
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tlogger.trace("incremental_reader_selector {}: created for range: {} with {} sstables",
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this,
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*_pr,
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_sstables->all()->size());
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}
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incremental_reader_selector(const incremental_reader_selector&) = delete;
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incremental_reader_selector& operator=(const incremental_reader_selector&) = delete;
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incremental_reader_selector(incremental_reader_selector&&) = delete;
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incremental_reader_selector& operator=(incremental_reader_selector&&) = delete;
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virtual std::vector<flat_mutation_reader> create_new_readers(const std::optional<dht::ring_position_view>& pos) override {
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tlogger.trace("incremental_reader_selector {}: {}({})", this, __FUNCTION__, seastar::lazy_deref(pos));
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auto readers = std::vector<flat_mutation_reader>();
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do {
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auto selection = _selector->select(_selector_position);
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_selector_position = selection.next_position;
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tlogger.trace("incremental_reader_selector {}: {} sstables to consider, advancing selector to {}", this, selection.sstables.size(),
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_selector_position);
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readers = boost::copy_range<std::vector<flat_mutation_reader>>(selection.sstables
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| boost::adaptors::filtered([this] (auto& sst) { return _read_sstable_gens.emplace(sst->generation()).second; })
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| boost::adaptors::transformed([this] (auto& sst) { return this->create_reader(sst); }));
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} while (!_selector_position.is_max() && readers.empty() && (!pos || dht::ring_position_tri_compare(*_s, *pos, _selector_position) >= 0));
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tlogger.trace("incremental_reader_selector {}: created {} new readers", this, readers.size());
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// prevents sstable_set::incremental_selector::_current_sstables from holding reference to
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// sstables when done selecting.
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if (_selector_position.is_max()) {
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_selector.reset();
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}
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return readers;
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}
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virtual std::vector<flat_mutation_reader> fast_forward_to(const dht::partition_range& pr, db::timeout_clock::time_point timeout) override {
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_pr = ≺
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auto pos = dht::ring_position_view::for_range_start(*_pr);
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if (dht::ring_position_tri_compare(*_s, pos, _selector_position) >= 0) {
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return create_new_readers(pos);
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}
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return {};
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}
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};
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static flat_mutation_reader
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create_single_key_sstable_reader(column_family* cf,
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schema_ptr schema,
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reader_permit permit,
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lw_shared_ptr<sstables::sstable_set> sstables,
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utils::estimated_histogram& sstable_histogram,
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const dht::partition_range& pr, // must be singular
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const query::partition_slice& slice,
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const io_priority_class& pc,
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tracing::trace_state_ptr trace_state,
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streamed_mutation::forwarding fwd,
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mutation_reader::forwarding fwd_mr)
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{
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auto& pk = pr.start()->value().key();
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auto key = sstables::key::from_partition_key(*schema, *pk);
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auto selected_sstables = filter_sstable_for_reader_by_pk(sstables->select(pr), *cf, schema, pr, key);
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auto num_sstables = selected_sstables.size();
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if (!num_sstables) {
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return make_empty_flat_reader(schema);
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}
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auto readers = boost::copy_range<std::vector<flat_mutation_reader>>(
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filter_sstable_for_reader_by_ck(std::move(selected_sstables), *cf, schema, slice)
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| boost::adaptors::transformed([&] (const sstables::shared_sstable& sstable) {
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tracing::trace(trace_state, "Reading key {} from sstable {}", pr, seastar::value_of([&sstable] { return sstable->get_filename(); }));
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return sstable->read_row_flat(schema, permit, pr.start()->value(), slice, pc, trace_state, fwd);
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})
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);
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// If filter_sstable_for_reader_by_ck filtered any sstable that contains the partition
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// we want to emit partition_start/end if no rows were found,
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// to prevent https://github.com/scylladb/scylla/issues/3552.
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//
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// Use `flat_mutation_reader_from_mutations` with an empty mutation to emit
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// the partition_start/end pair and append it to the list of readers passed
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// to make_combined_reader to ensure partition_start/end are emitted even if
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// all sstables actually containing the partition were filtered.
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auto num_readers = readers.size();
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if (num_readers != num_sstables) {
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readers.push_back(flat_mutation_reader_from_mutations({mutation(schema, *pk)}, slice, fwd));
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}
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sstable_histogram.add(num_readers);
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return make_combined_reader(schema, std::move(readers), fwd, fwd_mr);
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}
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flat_mutation_reader make_range_sstable_reader(schema_ptr s,
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reader_permit permit,
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lw_shared_ptr<sstables::sstable_set> sstables,
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const dht::partition_range& pr,
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const query::partition_slice& slice,
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const io_priority_class& pc,
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tracing::trace_state_ptr trace_state,
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streamed_mutation::forwarding fwd,
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mutation_reader::forwarding fwd_mr,
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sstables::read_monitor_generator& monitor_generator)
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{
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auto reader_factory_fn = [s, permit, &slice, &pc, trace_state, fwd, fwd_mr, &monitor_generator]
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(sstables::shared_sstable& sst, const dht::partition_range& pr) mutable {
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return sst->read_range_rows_flat(s, permit, pr, slice, pc, trace_state, fwd, fwd_mr, monitor_generator(sst));
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};
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return make_combined_reader(s, std::make_unique<incremental_reader_selector>(s,
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std::move(sstables),
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pr,
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std::move(trace_state),
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std::move(reader_factory_fn)),
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fwd,
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fwd_mr);
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}
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flat_mutation_reader make_restricted_range_sstable_reader(schema_ptr s,
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reader_permit permit,
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lw_shared_ptr<sstables::sstable_set> sstables,
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const dht::partition_range& pr,
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const query::partition_slice& slice,
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const io_priority_class& pc,
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tracing::trace_state_ptr trace_state,
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streamed_mutation::forwarding fwd,
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mutation_reader::forwarding fwd_mr,
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sstables::read_monitor_generator& monitor_generator)
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{
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auto ms = mutation_source([sstables=std::move(sstables), &monitor_generator] (
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schema_ptr s,
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reader_permit permit,
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const dht::partition_range& pr,
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const query::partition_slice& slice,
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const io_priority_class& pc,
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tracing::trace_state_ptr trace_state,
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streamed_mutation::forwarding fwd,
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mutation_reader::forwarding fwd_mr) {
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return make_range_sstable_reader(std::move(s), std::move(permit), std::move(sstables), pr, slice, pc,
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std::move(trace_state), fwd, fwd_mr, monitor_generator);
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});
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return make_restricted_flat_reader(std::move(ms), std::move(s), std::move(permit), pr, slice, pc, std::move(trace_state), fwd, fwd_mr);
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}
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flat_mutation_reader
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table::make_sstable_reader(schema_ptr s,
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reader_permit permit,
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lw_shared_ptr<sstables::sstable_set> sstables,
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const dht::partition_range& pr,
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const query::partition_slice& slice,
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const io_priority_class& pc,
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tracing::trace_state_ptr trace_state,
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streamed_mutation::forwarding fwd,
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mutation_reader::forwarding fwd_mr) const {
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// CAVEAT: if make_sstable_reader() is called on a single partition
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// we want to optimize and read exactly this partition. As a
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// consequence, fast_forward_to() will *NOT* work on the result,
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// regardless of what the fwd_mr parameter says.
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auto ms = [&] () -> mutation_source {
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if (pr.is_singular() && pr.start()->value().has_key()) {
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const dht::ring_position& pos = pr.start()->value();
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if (dht::shard_of(*s, pos.token()) != this_shard_id()) {
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return mutation_source([] (
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schema_ptr s,
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reader_permit permit,
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const dht::partition_range& pr,
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const query::partition_slice& slice,
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const io_priority_class& pc,
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tracing::trace_state_ptr trace_state,
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streamed_mutation::forwarding fwd,
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mutation_reader::forwarding fwd_mr) {
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return make_empty_flat_reader(s); // range doesn't belong to this shard
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});
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}
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return mutation_source([this, sstables=std::move(sstables)] (
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schema_ptr s,
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reader_permit permit,
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const dht::partition_range& pr,
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const query::partition_slice& slice,
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const io_priority_class& pc,
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tracing::trace_state_ptr trace_state,
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streamed_mutation::forwarding fwd,
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mutation_reader::forwarding fwd_mr) {
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return create_single_key_sstable_reader(const_cast<column_family*>(this), std::move(s), std::move(permit), std::move(sstables),
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_stats.estimated_sstable_per_read, pr, slice, pc, std::move(trace_state), fwd, fwd_mr);
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});
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} else {
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return mutation_source([sstables=std::move(sstables)] (
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schema_ptr s,
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reader_permit permit,
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const dht::partition_range& pr,
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const query::partition_slice& slice,
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const io_priority_class& pc,
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tracing::trace_state_ptr trace_state,
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streamed_mutation::forwarding fwd,
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mutation_reader::forwarding fwd_mr) {
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return make_local_shard_sstable_reader(std::move(s), std::move(permit), std::move(sstables), pr, slice, pc,
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std::move(trace_state), fwd, fwd_mr);
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});
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}
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}();
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return make_restricted_flat_reader(std::move(ms), std::move(s), std::move(permit), pr, slice, pc, std::move(trace_state), fwd, fwd_mr);
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}
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// Exposed for testing, not performance critical.
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future<table::const_mutation_partition_ptr>
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table::find_partition(schema_ptr s, reader_permit permit, const dht::decorated_key& key) const {
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return do_with(dht::partition_range::make_singular(key), [s = std::move(s), permit = std::move(permit), this] (auto& range) mutable {
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return do_with(this->make_reader(std::move(s), std::move(permit), range), [] (flat_mutation_reader& reader) {
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return read_mutation_from_flat_mutation_reader(reader, db::no_timeout).then([] (mutation_opt&& mo) -> std::unique_ptr<const mutation_partition> {
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if (!mo) {
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return {};
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}
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return std::make_unique<const mutation_partition>(std::move(mo->partition()));
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});
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});
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});
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}
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future<table::const_mutation_partition_ptr>
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table::find_partition_slow(schema_ptr s, reader_permit permit, const partition_key& key) const {
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return find_partition(s, std::move(permit), dht::decorate_key(*s, key));
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}
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future<table::const_row_ptr>
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table::find_row(schema_ptr s, reader_permit permit, const dht::decorated_key& partition_key, clustering_key clustering_key) const {
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return find_partition(s, std::move(permit), partition_key).then([clustering_key = std::move(clustering_key), s] (const_mutation_partition_ptr p) {
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if (!p) {
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return make_ready_future<const_row_ptr>();
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}
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auto r = p->find_row(*s, clustering_key);
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if (r) {
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// FIXME: remove copy if only one data source
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return make_ready_future<const_row_ptr>(std::make_unique<row>(*s, column_kind::regular_column, *r));
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} else {
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return make_ready_future<const_row_ptr>();
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}
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});
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}
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flat_mutation_reader
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table::make_reader(schema_ptr s,
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reader_permit permit,
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const dht::partition_range& range,
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const query::partition_slice& slice,
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const io_priority_class& pc,
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tracing::trace_state_ptr trace_state,
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streamed_mutation::forwarding fwd,
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mutation_reader::forwarding fwd_mr) const {
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if (_virtual_reader) {
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return (*_virtual_reader).make_reader(s, std::move(permit), range, slice, pc, trace_state, fwd, fwd_mr);
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}
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std::vector<flat_mutation_reader> readers;
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readers.reserve(_memtables->size() + 1);
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// We're assuming that cache and memtables are both read atomically
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// for single-key queries, so we don't need to special case memtable
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// undergoing a move to cache. At any given point in time between
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// deferring points the sum of data in memtable and cache is coherent. If
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// single-key queries for each data source were performed across deferring
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// points, it would be possible that partitions which are ahead of the
|
|
// memtable cursor would be placed behind the cache cursor, resulting in
|
|
// those partitions being missing in the combined reader.
|
|
//
|
|
// We need to handle this in range queries though, as they are always
|
|
// deferring. scanning_reader from memtable.cc is falling back to reading
|
|
// the sstable when memtable is flushed. After memtable is moved to cache,
|
|
// new readers will no longer use the old memtable, but until then
|
|
// performance may suffer. We should fix this when we add support for
|
|
// range queries in cache, so that scans can always be satisfied form
|
|
// memtable and cache only, as long as data is not evicted.
|
|
//
|
|
// https://github.com/scylladb/scylla/issues/309
|
|
// https://github.com/scylladb/scylla/issues/185
|
|
|
|
for (auto&& mt : *_memtables) {
|
|
readers.emplace_back(mt->make_flat_reader(s, permit, range, slice, pc, trace_state, fwd, fwd_mr));
|
|
}
|
|
|
|
if (cache_enabled() && !slice.options.contains(query::partition_slice::option::bypass_cache)) {
|
|
readers.emplace_back(_cache.make_reader(s, permit, range, slice, pc, std::move(trace_state), fwd, fwd_mr));
|
|
} else {
|
|
readers.emplace_back(make_sstable_reader(s, permit, _sstables, range, slice, pc, std::move(trace_state), fwd, fwd_mr));
|
|
}
|
|
|
|
auto comb_reader = make_combined_reader(s, std::move(readers), fwd, fwd_mr);
|
|
if (_config.data_listeners && !_config.data_listeners->empty()) {
|
|
return _config.data_listeners->on_read(s, range, slice, std::move(comb_reader));
|
|
} else {
|
|
return comb_reader;
|
|
}
|
|
}
|
|
|
|
sstables::shared_sstable table::make_streaming_sstable_for_write(std::optional<sstring> subdir) {
|
|
sstring dir = _config.datadir;
|
|
if (subdir) {
|
|
dir += "/" + *subdir;
|
|
}
|
|
auto newtab = make_sstable(dir);
|
|
tlogger.debug("Created sstable for streaming: ks={}, cf={}, dir={}", schema()->ks_name(), schema()->cf_name(), dir);
|
|
return newtab;
|
|
}
|
|
|
|
flat_mutation_reader
|
|
table::make_streaming_reader(schema_ptr s,
|
|
const dht::partition_range_vector& ranges) const {
|
|
auto permit = _config.streaming_read_concurrency_semaphore->make_permit();
|
|
auto& slice = s->full_slice();
|
|
auto& pc = service::get_local_streaming_priority();
|
|
|
|
auto source = mutation_source([this] (schema_ptr s, reader_permit permit, const dht::partition_range& range, const query::partition_slice& slice,
|
|
const io_priority_class& pc, tracing::trace_state_ptr trace_state, streamed_mutation::forwarding fwd, mutation_reader::forwarding fwd_mr) {
|
|
std::vector<flat_mutation_reader> readers;
|
|
readers.reserve(_memtables->size() + 1);
|
|
for (auto&& mt : *_memtables) {
|
|
readers.emplace_back(mt->make_flat_reader(s, permit, range, slice, pc, trace_state, fwd, fwd_mr));
|
|
}
|
|
readers.emplace_back(make_sstable_reader(s, permit, _sstables, range, slice, pc, std::move(trace_state), fwd, fwd_mr));
|
|
return make_combined_reader(s, std::move(readers), fwd, fwd_mr);
|
|
});
|
|
|
|
return make_flat_multi_range_reader(s, std::move(permit), std::move(source), ranges, slice, pc, nullptr, mutation_reader::forwarding::no);
|
|
}
|
|
|
|
flat_mutation_reader table::make_streaming_reader(schema_ptr schema, const dht::partition_range& range,
|
|
const query::partition_slice& slice, mutation_reader::forwarding fwd_mr) const {
|
|
auto permit = _config.streaming_read_concurrency_semaphore->make_permit();
|
|
const auto& pc = service::get_local_streaming_priority();
|
|
auto trace_state = tracing::trace_state_ptr();
|
|
const auto fwd = streamed_mutation::forwarding::no;
|
|
|
|
std::vector<flat_mutation_reader> readers;
|
|
readers.reserve(_memtables->size() + 1);
|
|
for (auto&& mt : *_memtables) {
|
|
readers.emplace_back(mt->make_flat_reader(schema, permit, range, slice, pc, trace_state, fwd, fwd_mr));
|
|
}
|
|
readers.emplace_back(make_sstable_reader(schema, permit, _sstables, range, slice, pc, std::move(trace_state), fwd, fwd_mr));
|
|
return make_combined_reader(std::move(schema), std::move(readers), fwd, fwd_mr);
|
|
}
|
|
|
|
future<std::vector<locked_cell>> table::lock_counter_cells(const mutation& m, db::timeout_clock::time_point timeout) {
|
|
assert(m.schema() == _counter_cell_locks->schema());
|
|
return _counter_cell_locks->lock_cells(m.decorated_key(), partition_cells_range(m.partition()), timeout);
|
|
}
|
|
|
|
// Not performance critical. Currently used for testing only.
|
|
future<bool>
|
|
table::for_all_partitions_slow(schema_ptr s, reader_permit permit, std::function<bool (const dht::decorated_key&, const mutation_partition&)> func) const {
|
|
struct iteration_state {
|
|
flat_mutation_reader reader;
|
|
std::function<bool (const dht::decorated_key&, const mutation_partition&)> func;
|
|
bool ok = true;
|
|
bool empty = false;
|
|
public:
|
|
bool done() const { return !ok || empty; }
|
|
iteration_state(schema_ptr s, reader_permit permit, const column_family& cf,
|
|
std::function<bool (const dht::decorated_key&, const mutation_partition&)>&& func)
|
|
: reader(cf.make_reader(std::move(s), std::move(permit)))
|
|
, func(std::move(func))
|
|
{ }
|
|
};
|
|
|
|
return do_with(iteration_state(std::move(s), std::move(permit), *this, std::move(func)), [] (iteration_state& is) {
|
|
return do_until([&is] { return is.done(); }, [&is] {
|
|
return read_mutation_from_flat_mutation_reader(is.reader, db::no_timeout).then([&is](mutation_opt&& mo) {
|
|
if (!mo) {
|
|
is.empty = true;
|
|
} else {
|
|
is.ok = is.func(mo->decorated_key(), mo->partition());
|
|
}
|
|
});
|
|
}).then([&is] {
|
|
return is.ok;
|
|
});
|
|
});
|
|
}
|
|
|
|
static bool belongs_to_current_shard(const std::vector<shard_id>& shards) {
|
|
return boost::find(shards, this_shard_id()) != shards.end();
|
|
}
|
|
|
|
static bool belongs_to_other_shard(const std::vector<shard_id>& shards) {
|
|
return shards.size() != size_t(belongs_to_current_shard(shards));
|
|
}
|
|
|
|
flat_mutation_reader make_local_shard_sstable_reader(schema_ptr s,
|
|
reader_permit permit,
|
|
lw_shared_ptr<sstables::sstable_set> sstables,
|
|
const dht::partition_range& pr,
|
|
const query::partition_slice& slice,
|
|
const io_priority_class& pc,
|
|
tracing::trace_state_ptr trace_state,
|
|
streamed_mutation::forwarding fwd,
|
|
mutation_reader::forwarding fwd_mr,
|
|
sstables::read_monitor_generator& monitor_generator)
|
|
{
|
|
auto reader_factory_fn = [s, permit, &slice, &pc, trace_state, fwd, fwd_mr, &monitor_generator]
|
|
(sstables::shared_sstable& sst, const dht::partition_range& pr) mutable {
|
|
flat_mutation_reader reader = sst->read_range_rows_flat(s, permit, pr, slice, pc,
|
|
trace_state, fwd, fwd_mr, monitor_generator(sst));
|
|
if (sst->is_shared()) {
|
|
auto filter = [&s = *s](const dht::decorated_key& dk) -> bool {
|
|
return dht::shard_of(s, dk.token()) == this_shard_id();
|
|
};
|
|
reader = make_filtering_reader(std::move(reader), std::move(filter));
|
|
}
|
|
return reader;
|
|
};
|
|
return make_combined_reader(s, std::make_unique<incremental_reader_selector>(s,
|
|
std::move(sstables),
|
|
pr,
|
|
std::move(trace_state),
|
|
std::move(reader_factory_fn)),
|
|
fwd,
|
|
fwd_mr);
|
|
}
|
|
|
|
sstables::shared_sstable table::make_sstable(sstring dir, int64_t generation, sstables::sstable_version_types v, sstables::sstable_format_types f,
|
|
io_error_handler_gen error_handler_gen) {
|
|
return get_sstables_manager().make_sstable(_schema, dir, generation, v, f, gc_clock::now(), error_handler_gen);
|
|
}
|
|
|
|
sstables::shared_sstable table::make_sstable(sstring dir, int64_t generation,
|
|
sstables::sstable_version_types v, sstables::sstable_format_types f) {
|
|
return get_sstables_manager().make_sstable(_schema, dir, generation, v, f);
|
|
}
|
|
|
|
sstables::shared_sstable table::make_sstable(sstring dir) {
|
|
return make_sstable(dir, calculate_generation_for_new_table(),
|
|
get_sstables_manager().get_highest_supported_format(), sstables::sstable::format_types::big);
|
|
}
|
|
|
|
sstables::shared_sstable table::make_sstable() {
|
|
return make_sstable(_config.datadir);
|
|
}
|
|
|
|
void table::load_sstable(sstables::shared_sstable& sst, bool reset_level) {
|
|
if (reset_level) {
|
|
// When loading a migrated sstable, set level to 0 because
|
|
// it may overlap with existing tables in levels > 0.
|
|
// This step is optional, because even if we didn't do this
|
|
// scylla would detect the overlap, and bring back some of
|
|
// the sstables to level 0.
|
|
sst->set_sstable_level(0);
|
|
}
|
|
add_sstable(sst);
|
|
}
|
|
|
|
void table::update_stats_for_new_sstable(uint64_t disk_space_used_by_sstable) noexcept {
|
|
_stats.live_disk_space_used += disk_space_used_by_sstable;
|
|
_stats.total_disk_space_used += disk_space_used_by_sstable;
|
|
_stats.live_sstable_count++;
|
|
}
|
|
|
|
inline void table::add_sstable_to_backlog_tracker(compaction_backlog_tracker& tracker, sstables::shared_sstable sstable) {
|
|
tracker.add_sstable(std::move(sstable));
|
|
}
|
|
|
|
inline void table::remove_sstable_from_backlog_tracker(compaction_backlog_tracker& tracker, sstables::shared_sstable sstable) {
|
|
tracker.remove_sstable(std::move(sstable));
|
|
}
|
|
|
|
void table::add_sstable(sstables::shared_sstable sstable) {
|
|
if (belongs_to_other_shard(sstable->get_shards_for_this_sstable())) {
|
|
on_internal_error(tlogger, format("Attempted to load the shared SSTable {} at table", sstable->get_filename()));
|
|
}
|
|
// allow in-progress reads to continue using old list
|
|
auto new_sstables = make_lw_shared<sstables::sstable_set>(*_sstables);
|
|
new_sstables->insert(sstable);
|
|
_sstables = std::move(new_sstables);
|
|
update_stats_for_new_sstable(sstable->bytes_on_disk());
|
|
if (sstable->requires_view_building()) {
|
|
_sstables_staging.emplace(sstable->generation(), sstable);
|
|
} else {
|
|
add_sstable_to_backlog_tracker(_compaction_strategy.get_backlog_tracker(), sstable);
|
|
}
|
|
}
|
|
|
|
future<>
|
|
table::add_sstable_and_update_cache(sstables::shared_sstable sst) {
|
|
return get_row_cache().invalidate([this, sst] () noexcept {
|
|
// FIXME: this is not really noexcept, but we need to provide strong exception guarantees.
|
|
// atomically load all opened sstables into column family.
|
|
add_sstable(sst);
|
|
trigger_compaction();
|
|
}, dht::partition_range::make({sst->get_first_decorated_key(), true}, {sst->get_last_decorated_key(), true}));
|
|
}
|
|
|
|
future<>
|
|
table::update_cache(lw_shared_ptr<memtable> m, sstables::shared_sstable sst) {
|
|
auto adder = [this, m, sst] {
|
|
auto newtab_ms = sst->as_mutation_source();
|
|
add_sstable(sst);
|
|
m->mark_flushed(std::move(newtab_ms));
|
|
try_trigger_compaction();
|
|
};
|
|
if (cache_enabled()) {
|
|
return _cache.update(adder, *m);
|
|
} else {
|
|
return _cache.invalidate(adder).then([m] { return m->clear_gently(); });
|
|
}
|
|
}
|
|
|
|
// Handles permit management only, used for situations where we don't want to inform
|
|
// the compaction manager about backlogs (i.e., tests)
|
|
class permit_monitor : public sstables::write_monitor {
|
|
sstable_write_permit _permit;
|
|
public:
|
|
permit_monitor(sstable_write_permit&& permit)
|
|
: _permit(std::move(permit)) {
|
|
}
|
|
|
|
virtual void on_write_started(const sstables::writer_offset_tracker& t) override { }
|
|
virtual void on_data_write_completed() override {
|
|
// We need to start a flush before the current one finishes, otherwise
|
|
// we'll have a period without significant disk activity when the current
|
|
// SSTable is being sealed, the caches are being updated, etc. To do that,
|
|
// we ensure the permit doesn't outlive this continuation.
|
|
_permit = sstable_write_permit::unconditional();
|
|
}
|
|
};
|
|
|
|
// Handles all tasks related to sstable writing: permit management, compaction backlog updates, etc
|
|
class database_sstable_write_monitor : public permit_monitor, public backlog_write_progress_manager {
|
|
sstables::shared_sstable _sst;
|
|
compaction_manager& _compaction_manager;
|
|
sstables::compaction_strategy& _compaction_strategy;
|
|
const sstables::writer_offset_tracker* _tracker = nullptr;
|
|
uint64_t _progress_seen = 0;
|
|
api::timestamp_type _maximum_timestamp;
|
|
public:
|
|
database_sstable_write_monitor(sstable_write_permit&& permit, sstables::shared_sstable sst, compaction_manager& manager,
|
|
sstables::compaction_strategy& strategy, api::timestamp_type max_timestamp)
|
|
: permit_monitor(std::move(permit))
|
|
, _sst(std::move(sst))
|
|
, _compaction_manager(manager)
|
|
, _compaction_strategy(strategy)
|
|
, _maximum_timestamp(max_timestamp)
|
|
{}
|
|
|
|
database_sstable_write_monitor(const database_sstable_write_monitor&) = delete;
|
|
database_sstable_write_monitor(database_sstable_write_monitor&& x) = default;
|
|
|
|
~database_sstable_write_monitor() {
|
|
// We failed to finish handling this SSTable, so we have to update the backlog_tracker
|
|
// about it.
|
|
if (_sst) {
|
|
_compaction_strategy.get_backlog_tracker().revert_charges(_sst);
|
|
}
|
|
}
|
|
|
|
virtual void on_write_started(const sstables::writer_offset_tracker& t) override {
|
|
_tracker = &t;
|
|
_compaction_strategy.get_backlog_tracker().register_partially_written_sstable(_sst, *this);
|
|
}
|
|
|
|
virtual void on_data_write_completed() override {
|
|
permit_monitor::on_data_write_completed();
|
|
_progress_seen = _tracker->offset;
|
|
_tracker = nullptr;
|
|
}
|
|
|
|
virtual uint64_t written() const override {
|
|
if (_tracker) {
|
|
return _tracker->offset;
|
|
}
|
|
return _progress_seen;
|
|
}
|
|
|
|
api::timestamp_type maximum_timestamp() const override {
|
|
return _maximum_timestamp;
|
|
}
|
|
|
|
unsigned level() const override {
|
|
return 0;
|
|
}
|
|
};
|
|
|
|
future<>
|
|
table::seal_active_memtable(flush_permit&& permit) {
|
|
auto old = _memtables->back();
|
|
tlogger.debug("Sealing active memtable of {}.{}, partitions: {}, occupancy: {}", _schema->ks_name(), _schema->cf_name(), old->partition_count(), old->occupancy());
|
|
|
|
if (old->empty()) {
|
|
tlogger.debug("Memtable is empty");
|
|
return _flush_barrier.advance_and_await();
|
|
}
|
|
_memtables->add_memtable();
|
|
_stats.memtable_switch_count++;
|
|
// This will set evictable occupancy of the old memtable region to zero, so that
|
|
// this region is considered last for flushing by dirty_memory_manager::flush_when_needed().
|
|
// If we don't do that, the flusher may keep picking up this memtable list for flushing after
|
|
// the permit is released even though there is not much to flush in the active memtable of this list.
|
|
old->region().ground_evictable_occupancy();
|
|
auto previous_flush = _flush_barrier.advance_and_await();
|
|
auto op = _flush_barrier.start();
|
|
|
|
auto memtable_size = old->occupancy().total_space();
|
|
|
|
_stats.pending_flushes++;
|
|
_config.cf_stats->pending_memtables_flushes_count++;
|
|
_config.cf_stats->pending_memtables_flushes_bytes += memtable_size;
|
|
|
|
return do_with(std::move(permit), [this, old] (auto& permit) {
|
|
return repeat([this, old, &permit] () mutable {
|
|
auto sstable_write_permit = permit.release_sstable_write_permit();
|
|
return this->try_flush_memtable_to_sstable(old, std::move(sstable_write_permit)).then([this, &permit] (auto should_stop) mutable {
|
|
if (should_stop) {
|
|
return make_ready_future<stop_iteration>(should_stop);
|
|
}
|
|
return sleep(10s).then([this, &permit] () mutable {
|
|
return std::move(permit).reacquire_sstable_write_permit().then([this, &permit] (auto new_permit) mutable {
|
|
permit = std::move(new_permit);
|
|
return make_ready_future<stop_iteration>(stop_iteration::no);
|
|
});
|
|
});
|
|
});
|
|
});
|
|
}).then([this, memtable_size, old, op = std::move(op), previous_flush = std::move(previous_flush)] () mutable {
|
|
_stats.pending_flushes--;
|
|
_config.cf_stats->pending_memtables_flushes_count--;
|
|
_config.cf_stats->pending_memtables_flushes_bytes -= memtable_size;
|
|
|
|
if (_commitlog) {
|
|
_commitlog->discard_completed_segments(_schema->id(), old->rp_set());
|
|
}
|
|
return previous_flush.finally([op = std::move(op)] { });
|
|
});
|
|
// FIXME: release commit log
|
|
// FIXME: provide back-pressure to upper layers
|
|
}
|
|
|
|
future<stop_iteration>
|
|
table::try_flush_memtable_to_sstable(lw_shared_ptr<memtable> old, sstable_write_permit&& permit) {
|
|
return with_scheduling_group(_config.memtable_scheduling_group, [this, old = std::move(old), permit = std::move(permit)] () mutable {
|
|
auto newtab = make_sstable();
|
|
|
|
tlogger.debug("Flushing to {}", newtab->get_filename());
|
|
// Note that due to our sharded architecture, it is possible that
|
|
// in the face of a value change some shards will backup sstables
|
|
// while others won't.
|
|
//
|
|
// This is, in theory, possible to mitigate through a rwlock.
|
|
// However, this doesn't differ from the situation where all tables
|
|
// are coming from a single shard and the toggle happens in the
|
|
// middle of them.
|
|
//
|
|
// The code as is guarantees that we'll never partially backup a
|
|
// single sstable, so that is enough of a guarantee.
|
|
database_sstable_write_monitor monitor(std::move(permit), newtab, _compaction_manager, _compaction_strategy, old->get_max_timestamp());
|
|
return do_with(std::move(monitor), [this, old, newtab] (auto& monitor) {
|
|
auto&& priority = service::get_local_memtable_flush_priority();
|
|
sstables::sstable_writer_config cfg = get_sstables_manager().configure_writer();
|
|
cfg.backup = incremental_backups_enabled();
|
|
auto f = write_memtable_to_sstable(*old, newtab, monitor, cfg, priority);
|
|
// Switch back to default scheduling group for post-flush actions, to avoid them being staved by the memtable flush
|
|
// controller. Cache update does not affect the input of the memtable cpu controller, so it can be subject to
|
|
// priority inversion.
|
|
return with_scheduling_group(default_scheduling_group(), [this, old = std::move(old), newtab = std::move(newtab), f = std::move(f)] () mutable {
|
|
return f.then([this, newtab, old] {
|
|
return newtab->open_data().then([this, old, newtab] () {
|
|
tlogger.debug("Flushing to {} done", newtab->get_filename());
|
|
return with_scheduling_group(_config.memtable_to_cache_scheduling_group, [this, old, newtab] {
|
|
return update_cache(old, newtab);
|
|
});
|
|
}).then([this, old, newtab] () noexcept {
|
|
_memtables->erase(old);
|
|
tlogger.debug("Memtable for {} replaced", newtab->get_filename());
|
|
return stop_iteration::yes;
|
|
});
|
|
}).handle_exception([this, old, newtab] (auto e) {
|
|
newtab->mark_for_deletion();
|
|
_config.cf_stats->failed_memtables_flushes_count++;
|
|
tlogger.error("failed to write sstable {}: {}", newtab->get_filename(), e);
|
|
// If we failed this write we will try the write again and that will create a new flush reader
|
|
// that will decrease dirty memory again. So we need to reset the accounting.
|
|
old->revert_flushed_memory();
|
|
return stop_iteration(_async_gate.is_closed());
|
|
});
|
|
});
|
|
});
|
|
});
|
|
}
|
|
|
|
void
|
|
table::start() {
|
|
// FIXME: add option to disable automatic compaction.
|
|
start_compaction();
|
|
}
|
|
|
|
future<>
|
|
table::stop() {
|
|
if (_async_gate.is_closed()) {
|
|
return make_ready_future<>();
|
|
}
|
|
return _async_gate.close().then([this] {
|
|
return when_all(await_pending_writes(), await_pending_reads(), await_pending_streams()).discard_result().finally([this] {
|
|
return _memtables->request_flush().finally([this] {
|
|
return _compaction_manager.remove(this).then([this] {
|
|
// Nest, instead of using when_all, so we don't lose any exceptions.
|
|
return _streaming_flush_gate.close();
|
|
}).then([this] {
|
|
return _sstable_deletion_gate.close();
|
|
});
|
|
});
|
|
});
|
|
});
|
|
}
|
|
|
|
future<std::vector<sstables::entry_descriptor>>
|
|
table::reshuffle_sstables(std::set<int64_t> all_generations, int64_t start) {
|
|
struct work {
|
|
std::set<int64_t> all_generations; // Stores generation of all live sstables in the system.
|
|
work(int64_t start, std::set<int64_t> gens)
|
|
: all_generations(gens) {}
|
|
};
|
|
|
|
return do_with(work(start, std::move(all_generations)), [this] (work& work) {
|
|
tlogger.info("Reshuffling SSTables in {}...", _config.datadir);
|
|
return lister::scan_dir(_config.datadir, { directory_entry_type::regular }, [this, &work] (fs::path parent_dir, directory_entry de) {
|
|
auto comps = sstables::entry_descriptor::make_descriptor(parent_dir.native(), de.name);
|
|
if (comps.component != component_type::TOC) {
|
|
return make_ready_future<>();
|
|
}
|
|
// Skip generations that were already loaded by Scylla at a previous stage.
|
|
if (work.all_generations.contains(comps.generation)) {
|
|
return make_ready_future<>();
|
|
}
|
|
return make_exception_future<>(std::runtime_error("Loading SSTables from the main SSTable directory is unsafe and no longer supported."
|
|
" You will find a directory called upload/ inside the table directory that can be used to load new SSTables into the system"));
|
|
}, &sstables::manifest_json_filter).then([&work] {
|
|
return make_ready_future<std::vector<sstables::entry_descriptor>>();
|
|
});
|
|
});
|
|
}
|
|
|
|
void table::set_metrics() {
|
|
auto cf = column_family_label(_schema->cf_name());
|
|
auto ks = keyspace_label(_schema->ks_name());
|
|
namespace ms = seastar::metrics;
|
|
if (_config.enable_metrics_reporting) {
|
|
_metrics.add_group("column_family", {
|
|
ms::make_derive("memtable_switch", ms::description("Number of times flush has resulted in the memtable being switched out"), _stats.memtable_switch_count)(cf)(ks),
|
|
ms::make_counter("memtable_partition_writes", [this] () { return _stats.memtable_partition_insertions + _stats.memtable_partition_hits; }, ms::description("Number of write operations performed on partitions in memtables"))(cf)(ks),
|
|
ms::make_counter("memtable_partition_hits", _stats.memtable_partition_hits, ms::description("Number of times a write operation was issued on an existing partition in memtables"))(cf)(ks),
|
|
ms::make_counter("memtable_row_writes", _stats.memtable_app_stats.row_writes, ms::description("Number of row writes performed in memtables"))(cf)(ks),
|
|
ms::make_counter("memtable_row_hits", _stats.memtable_app_stats.row_hits, ms::description("Number of rows overwritten by write operations in memtables"))(cf)(ks),
|
|
ms::make_gauge("pending_tasks", ms::description("Estimated number of tasks pending for this column family"), _stats.pending_flushes)(cf)(ks),
|
|
ms::make_gauge("live_disk_space", ms::description("Live disk space used"), _stats.live_disk_space_used)(cf)(ks),
|
|
ms::make_gauge("total_disk_space", ms::description("Total disk space used"), _stats.total_disk_space_used)(cf)(ks),
|
|
ms::make_gauge("live_sstable", ms::description("Live sstable count"), _stats.live_sstable_count)(cf)(ks),
|
|
ms::make_gauge("pending_compaction", ms::description("Estimated number of compactions pending for this column family"), _stats.pending_compactions)(cf)(ks),
|
|
ms::make_gauge("pending_sstable_deletions",
|
|
ms::description("Number of tasks waiting to delete sstables from a table"),
|
|
[this] { return _sstable_deletion_sem.waiters(); })(cf)(ks)
|
|
});
|
|
|
|
// Metrics related to row locking
|
|
auto add_row_lock_metrics = [this, ks, cf] (row_locker::single_lock_stats& stats, sstring stat_name) {
|
|
_metrics.add_group("column_family", {
|
|
ms::make_total_operations(format("row_lock_{}_acquisitions", stat_name), stats.lock_acquisitions, ms::description(format("Row lock acquisitions for {} lock", stat_name)))(cf)(ks),
|
|
ms::make_queue_length(format("row_lock_{}_operations_currently_waiting_for_lock", stat_name), stats.operations_currently_waiting_for_lock, ms::description(format("Operations currently waiting for {} lock", stat_name)))(cf)(ks),
|
|
ms::make_histogram(format("row_lock_{}_waiting_time", stat_name), ms::description(format("Histogram representing time that operations spent on waiting for {} lock", stat_name)),
|
|
[&stats] {return to_metrics_histogram(stats.estimated_waiting_for_lock);})(cf)(ks)
|
|
});
|
|
};
|
|
add_row_lock_metrics(_row_locker_stats.exclusive_row, "exclusive_row");
|
|
add_row_lock_metrics(_row_locker_stats.shared_row, "shared_row");
|
|
add_row_lock_metrics(_row_locker_stats.exclusive_partition, "exclusive_partition");
|
|
add_row_lock_metrics(_row_locker_stats.shared_partition, "shared_partition");
|
|
|
|
// View metrics are created only for base tables, so there's no point in adding them to views (which cannot act as base tables for other views)
|
|
if (!_schema->is_view()) {
|
|
_view_stats.register_stats();
|
|
}
|
|
|
|
if (_schema->ks_name() != db::system_keyspace::NAME && _schema->ks_name() != db::schema_tables::v3::NAME && _schema->ks_name() != "system_traces") {
|
|
_metrics.add_group("column_family", {
|
|
ms::make_histogram("read_latency", ms::description("Read latency histogram"), [this] {return to_metrics_histogram(_stats.estimated_read);})(cf)(ks),
|
|
ms::make_histogram("write_latency", ms::description("Write latency histogram"), [this] {return to_metrics_histogram(_stats.estimated_write);})(cf)(ks),
|
|
ms::make_histogram("cas_prepare_latency", ms::description("CAS prepare round latency histogram"), [this] {return to_metrics_histogram(_stats.estimated_cas_prepare);})(cf)(ks),
|
|
ms::make_histogram("cas_propose_latency", ms::description("CAS accept round latency histogram"), [this] {return to_metrics_histogram(_stats.estimated_cas_accept);})(cf)(ks),
|
|
ms::make_histogram("cas_commit_latency", ms::description("CAS learn round latency histogram"), [this] {return to_metrics_histogram(_stats.estimated_cas_learn);})(cf)(ks),
|
|
ms::make_gauge("cache_hit_rate", ms::description("Cache hit rate"), [this] {return float(_global_cache_hit_rate);})(cf)(ks)
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
void table::rebuild_statistics() {
|
|
// zeroing live_disk_space_used and live_sstable_count because the
|
|
// sstable list was re-created
|
|
_stats.live_disk_space_used = 0;
|
|
_stats.live_sstable_count = 0;
|
|
|
|
for (auto&& tab : boost::range::join(_sstables_compacted_but_not_deleted,
|
|
// this might seem dangerous, but "move" here just avoids constness,
|
|
// making the two ranges compatible when compiling with boost 1.55.
|
|
// Noone is actually moving anything...
|
|
std::move(*_sstables->all()))) {
|
|
update_stats_for_new_sstable(tab->bytes_on_disk());
|
|
}
|
|
}
|
|
|
|
void
|
|
table::rebuild_sstable_list(const std::vector<sstables::shared_sstable>& new_sstables,
|
|
const std::vector<sstables::shared_sstable>& old_sstables) {
|
|
auto current_sstables = _sstables;
|
|
auto new_sstable_list = _compaction_strategy.make_sstable_set(_schema);
|
|
|
|
std::unordered_set<sstables::shared_sstable> s(old_sstables.begin(), old_sstables.end());
|
|
|
|
// this might seem dangerous, but "move" here just avoids constness,
|
|
// making the two ranges compatible when compiling with boost 1.55.
|
|
// Noone is actually moving anything...
|
|
for (auto&& tab : boost::range::join(new_sstables, std::move(*current_sstables->all()))) {
|
|
if (!s.contains(tab)) {
|
|
new_sstable_list.insert(tab);
|
|
}
|
|
}
|
|
_sstables = make_lw_shared<sstables::sstable_set>(std::move(new_sstable_list));
|
|
}
|
|
|
|
// Note: must run in a seastar thread
|
|
void
|
|
table::on_compaction_completion(sstables::compaction_completion_desc& desc) {
|
|
// Build a new list of _sstables: We remove from the existing list the
|
|
// tables we compacted (by now, there might be more sstables flushed
|
|
// later), and we add the new tables generated by the compaction.
|
|
// We create a new list rather than modifying it in-place, so that
|
|
// on-going reads can continue to use the old list.
|
|
//
|
|
// We only remove old sstables after they are successfully deleted,
|
|
// to avoid a new compaction from ignoring data in the old sstables
|
|
// if the deletion fails (note deletion of shared sstables can take
|
|
// unbounded time, because all shards must agree on the deletion).
|
|
|
|
// make sure all old sstables belong *ONLY* to current shard before we proceed to their deletion.
|
|
for (auto& sst : desc.old_sstables) {
|
|
auto shards = sst->get_shards_for_this_sstable();
|
|
if (shards.size() > 1) {
|
|
throw std::runtime_error(format("A regular compaction for {}.{} INCORRECTLY used shared sstable {}. Only resharding work with those!",
|
|
_schema->ks_name(), _schema->cf_name(), sst->toc_filename()));
|
|
}
|
|
if (!belongs_to_current_shard(shards)) {
|
|
throw std::runtime_error(format("A regular compaction for {}.{} INCORRECTLY used sstable {} which doesn't belong to this shard!",
|
|
_schema->ks_name(), _schema->cf_name(), sst->toc_filename()));
|
|
}
|
|
}
|
|
|
|
auto new_compacted_but_not_deleted = _sstables_compacted_but_not_deleted;
|
|
// rebuilding _sstables_compacted_but_not_deleted first to make the entire rebuild operation exception safe.
|
|
new_compacted_but_not_deleted.insert(new_compacted_but_not_deleted.end(), desc.old_sstables.begin(), desc.old_sstables.end());
|
|
|
|
_cache.invalidate([this, &desc] () noexcept {
|
|
// FIXME: this is not really noexcept, but we need to provide strong exception guarantees.
|
|
rebuild_sstable_list(desc.new_sstables, desc.old_sstables);
|
|
}, std::move(desc.ranges_for_cache_invalidation)).get();
|
|
|
|
// refresh underlying data source in row cache to prevent it from holding reference
|
|
// to sstables files that are about to be deleted.
|
|
_cache.refresh_snapshot();
|
|
|
|
_sstables_compacted_but_not_deleted = std::move(new_compacted_but_not_deleted);
|
|
|
|
rebuild_statistics();
|
|
|
|
auto f = seastar::with_gate(_sstable_deletion_gate, [this, sstables_to_remove = desc.old_sstables] {
|
|
return with_semaphore(_sstable_deletion_sem, 1, [sstables_to_remove = std::move(sstables_to_remove)] {
|
|
return sstables::delete_atomically(std::move(sstables_to_remove));
|
|
});
|
|
});
|
|
|
|
try {
|
|
f.get();
|
|
} catch (...) {
|
|
// There is nothing more we can do here.
|
|
// Any remaining SSTables will eventually be re-compacted and re-deleted.
|
|
tlogger.error("Compacted SSTables deletion failed: {}. Ignored.", std::current_exception());
|
|
}
|
|
|
|
// unconditionally remove compacted sstables from _sstables_compacted_but_not_deleted,
|
|
// or they could stay forever in the set, resulting in deleted files remaining
|
|
// opened and disk space not being released until shutdown.
|
|
std::unordered_set<sstables::shared_sstable> s(
|
|
desc.old_sstables.begin(), desc.old_sstables.end());
|
|
auto e = boost::range::remove_if(_sstables_compacted_but_not_deleted, [&] (sstables::shared_sstable sst) {
|
|
return s.contains(sst);
|
|
});
|
|
_sstables_compacted_but_not_deleted.erase(e, _sstables_compacted_but_not_deleted.end());
|
|
rebuild_statistics();
|
|
}
|
|
|
|
future<>
|
|
table::compact_sstables(sstables::compaction_descriptor descriptor) {
|
|
if (!descriptor.sstables.size()) {
|
|
// if there is nothing to compact, just return.
|
|
return make_ready_future<>();
|
|
}
|
|
|
|
descriptor.creator = [this] (shard_id dummy) {
|
|
auto sst = make_sstable();
|
|
return sst;
|
|
};
|
|
descriptor.replacer = [this, release_exhausted = descriptor.release_exhausted] (sstables::compaction_completion_desc desc) {
|
|
_compaction_strategy.notify_completion(desc.old_sstables, desc.new_sstables);
|
|
_compaction_manager.propagate_replacement(this, desc.old_sstables, desc.new_sstables);
|
|
this->on_compaction_completion(desc);
|
|
if (release_exhausted) {
|
|
release_exhausted(desc.old_sstables);
|
|
}
|
|
};
|
|
|
|
return sstables::compact_sstables(std::move(descriptor), *this).then([this] (auto info) {
|
|
if (info.type != sstables::compaction_type::Compaction) {
|
|
return make_ready_future<>();
|
|
}
|
|
// skip update if running without a query context, for example, when running a test case.
|
|
if (!db::qctx) {
|
|
return make_ready_future<>();
|
|
}
|
|
// FIXME: add support to merged_rows. merged_rows is a histogram that
|
|
// shows how many sstables each row is merged from. This information
|
|
// cannot be accessed until we make combined_reader more generic,
|
|
// for example, by adding a reducer method.
|
|
return db::system_keyspace::update_compaction_history(info.compaction_uuid, info.ks_name, info.cf_name, info.ended_at,
|
|
info.start_size, info.end_size, std::unordered_map<int32_t, int64_t>{});
|
|
});
|
|
}
|
|
|
|
// Note: We assume that the column_family does not get destroyed during compaction.
|
|
future<>
|
|
table::compact_all_sstables() {
|
|
return _compaction_manager.submit_major_compaction(this);
|
|
}
|
|
|
|
void table::start_compaction() {
|
|
set_compaction_strategy(_schema->compaction_strategy());
|
|
}
|
|
|
|
void table::trigger_compaction() {
|
|
// Submitting compaction job to compaction manager.
|
|
do_trigger_compaction(); // see below
|
|
}
|
|
|
|
void table::try_trigger_compaction() noexcept {
|
|
try {
|
|
trigger_compaction();
|
|
} catch (...) {
|
|
tlogger.error("Failed to trigger compaction: {}", std::current_exception());
|
|
}
|
|
}
|
|
|
|
void table::do_trigger_compaction() {
|
|
// But only submit if we're not locked out
|
|
if (!_compaction_disabled) {
|
|
_compaction_manager.submit(this);
|
|
}
|
|
}
|
|
|
|
future<> table::run_compaction(sstables::compaction_descriptor descriptor) {
|
|
return compact_sstables(std::move(descriptor));
|
|
}
|
|
|
|
void table::set_compaction_strategy(sstables::compaction_strategy_type strategy) {
|
|
tlogger.debug("Setting compaction strategy of {}.{} to {}", _schema->ks_name(), _schema->cf_name(), sstables::compaction_strategy::name(strategy));
|
|
auto new_cs = make_compaction_strategy(strategy, _schema->compaction_strategy_options());
|
|
|
|
_compaction_manager.register_backlog_tracker(new_cs.get_backlog_tracker());
|
|
auto move_read_charges = new_cs.type() == _compaction_strategy.type();
|
|
_compaction_strategy.get_backlog_tracker().transfer_ongoing_charges(new_cs.get_backlog_tracker(), move_read_charges);
|
|
|
|
auto new_sstables = new_cs.make_sstable_set(_schema);
|
|
for (auto&& s : *_sstables->all()) {
|
|
add_sstable_to_backlog_tracker(new_cs.get_backlog_tracker(), s);
|
|
new_sstables.insert(s);
|
|
}
|
|
|
|
if (!move_read_charges) {
|
|
_compaction_manager.stop_tracking_ongoing_compactions(this);
|
|
}
|
|
|
|
// now exception safe:
|
|
_compaction_strategy = std::move(new_cs);
|
|
_sstables = std::move(new_sstables);
|
|
}
|
|
|
|
size_t table::sstables_count() const {
|
|
return _sstables->all()->size();
|
|
}
|
|
|
|
std::vector<uint64_t> table::sstable_count_per_level() const {
|
|
std::vector<uint64_t> count_per_level;
|
|
for (auto&& sst : *_sstables->all()) {
|
|
auto level = sst->get_sstable_level();
|
|
|
|
if (level + 1 > count_per_level.size()) {
|
|
count_per_level.resize(level + 1, 0UL);
|
|
}
|
|
count_per_level[level]++;
|
|
}
|
|
return count_per_level;
|
|
}
|
|
|
|
int64_t table::get_unleveled_sstables() const {
|
|
// TODO: when we support leveled compaction, we should return the number of
|
|
// SSTables in L0. If leveled compaction is enabled in this column family,
|
|
// then we should return zero, as we currently do.
|
|
return 0;
|
|
}
|
|
|
|
future<std::unordered_set<sstring>> table::get_sstables_by_partition_key(const sstring& key) const {
|
|
return do_with(std::unordered_set<sstring>(), make_lw_shared<sstables::sstable_set::incremental_selector>(get_sstable_set().make_incremental_selector()),
|
|
partition_key(partition_key::from_nodetool_style_string(_schema, key)),
|
|
[this] (std::unordered_set<sstring>& filenames, lw_shared_ptr<sstables::sstable_set::incremental_selector>& sel, partition_key& pk) {
|
|
return do_with(dht::decorated_key(dht::decorate_key(*_schema, pk)),
|
|
[this, &filenames, &sel, &pk](dht::decorated_key& dk) mutable {
|
|
auto sst = sel->select(dk).sstables;
|
|
auto hk = sstables::sstable::make_hashed_key(*_schema, dk.key());
|
|
|
|
return do_for_each(sst, [this, &filenames, &dk, hk = std::move(hk)] (std::vector<sstables::shared_sstable>::const_iterator::reference s) mutable {
|
|
auto name = s->get_filename();
|
|
return s->has_partition_key(hk, dk).then([name = std::move(name), &filenames] (bool contains) mutable {
|
|
if (contains) {
|
|
filenames.insert(name);
|
|
}
|
|
});
|
|
});
|
|
}).then([&filenames] {
|
|
return make_ready_future<std::unordered_set<sstring>>(filenames);
|
|
});
|
|
});
|
|
}
|
|
|
|
const sstables::sstable_set& table::get_sstable_set() const {
|
|
return *_sstables;
|
|
}
|
|
|
|
lw_shared_ptr<const sstable_list> table::get_sstables() const {
|
|
return _sstables->all();
|
|
}
|
|
|
|
std::vector<sstables::shared_sstable> table::select_sstables(const dht::partition_range& range) const {
|
|
return _sstables->select(range);
|
|
}
|
|
|
|
std::vector<sstables::shared_sstable> table::candidates_for_compaction() const {
|
|
return boost::copy_range<std::vector<sstables::shared_sstable>>(*get_sstables()
|
|
| boost::adaptors::filtered([this] (auto& sst) {
|
|
return !_sstables_staging.contains(sst->generation());
|
|
}));
|
|
}
|
|
|
|
// Gets the list of all sstables in the column family, including ones that are
|
|
// not used for active queries because they have already been compacted, but are
|
|
// waiting for delete_atomically() to return.
|
|
//
|
|
// As long as we haven't deleted them, compaction needs to ensure it doesn't
|
|
// garbage-collect a tombstone that covers data in an sstable that may not be
|
|
// successfully deleted.
|
|
lw_shared_ptr<const sstable_list> table::get_sstables_including_compacted_undeleted() const {
|
|
if (_sstables_compacted_but_not_deleted.empty()) {
|
|
return get_sstables();
|
|
}
|
|
auto ret = make_lw_shared<sstable_list>(*_sstables->all());
|
|
for (auto&& s : _sstables_compacted_but_not_deleted) {
|
|
ret->insert(s);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
const std::vector<sstables::shared_sstable>& table::compacted_undeleted_sstables() const {
|
|
return _sstables_compacted_but_not_deleted;
|
|
}
|
|
|
|
lw_shared_ptr<memtable_list>
|
|
table::make_memory_only_memtable_list() {
|
|
auto get_schema = [this] { return schema(); };
|
|
return make_lw_shared<memtable_list>(std::move(get_schema), _config.dirty_memory_manager, _stats, _config.memory_compaction_scheduling_group);
|
|
}
|
|
|
|
lw_shared_ptr<memtable_list>
|
|
table::make_memtable_list() {
|
|
auto seal = [this] (flush_permit&& permit) {
|
|
return seal_active_memtable(std::move(permit));
|
|
};
|
|
auto get_schema = [this] { return schema(); };
|
|
return make_lw_shared<memtable_list>(std::move(seal), std::move(get_schema), _config.dirty_memory_manager, _stats, _config.memory_compaction_scheduling_group);
|
|
}
|
|
|
|
table::table(schema_ptr schema, config config, db::commitlog* cl, compaction_manager& compaction_manager,
|
|
cell_locker_stats& cl_stats, cache_tracker& row_cache_tracker)
|
|
: _schema(std::move(schema))
|
|
, _config(std::move(config))
|
|
, _view_stats(format("{}_{}_view_replica_update", _schema->ks_name(), _schema->cf_name()),
|
|
keyspace_label(_schema->ks_name()),
|
|
column_family_label(_schema->cf_name())
|
|
)
|
|
, _memtables(_config.enable_disk_writes ? make_memtable_list() : make_memory_only_memtable_list())
|
|
, _compaction_strategy(make_compaction_strategy(_schema->compaction_strategy(), _schema->compaction_strategy_options()))
|
|
, _sstables(make_lw_shared<sstables::sstable_set>(_compaction_strategy.make_sstable_set(_schema)))
|
|
, _cache(_schema, sstables_as_snapshot_source(), row_cache_tracker, is_continuous::yes)
|
|
, _commitlog(cl)
|
|
, _compaction_manager(compaction_manager)
|
|
, _index_manager(*this)
|
|
, _counter_cell_locks(_schema->is_counter() ? std::make_unique<cell_locker>(_schema, cl_stats) : nullptr)
|
|
, _row_locker(_schema)
|
|
{
|
|
if (!_config.enable_disk_writes) {
|
|
tlogger.warn("Writes disabled, column family no durable.");
|
|
}
|
|
set_metrics();
|
|
}
|
|
|
|
partition_presence_checker
|
|
table::make_partition_presence_checker(lw_shared_ptr<sstables::sstable_set> sstables) {
|
|
auto sel = make_lw_shared<sstables::sstable_set::incremental_selector>(sstables->make_incremental_selector());
|
|
return [this, sstables = std::move(sstables), sel = std::move(sel)] (const dht::decorated_key& key) {
|
|
auto& sst = sel->select(key).sstables;
|
|
if (sst.empty()) {
|
|
return partition_presence_checker_result::definitely_doesnt_exist;
|
|
}
|
|
auto hk = sstables::sstable::make_hashed_key(*_schema, key.key());
|
|
for (auto&& s : sst) {
|
|
if (s->filter_has_key(hk)) {
|
|
return partition_presence_checker_result::maybe_exists;
|
|
}
|
|
}
|
|
return partition_presence_checker_result::definitely_doesnt_exist;
|
|
};
|
|
}
|
|
|
|
snapshot_source
|
|
table::sstables_as_snapshot_source() {
|
|
return snapshot_source([this] () {
|
|
auto sst_set = _sstables;
|
|
return mutation_source([this, sst_set] (schema_ptr s,
|
|
reader_permit permit,
|
|
const dht::partition_range& r,
|
|
const query::partition_slice& slice,
|
|
const io_priority_class& pc,
|
|
tracing::trace_state_ptr trace_state,
|
|
streamed_mutation::forwarding fwd,
|
|
mutation_reader::forwarding fwd_mr) {
|
|
return make_sstable_reader(std::move(s), std::move(permit), sst_set, r, slice, pc, std::move(trace_state), fwd, fwd_mr);
|
|
}, [this, sst_set] {
|
|
return make_partition_presence_checker(sst_set);
|
|
});
|
|
});
|
|
}
|
|
|
|
// define in .cc, since sstable is forward-declared in .hh
|
|
table::~table() {
|
|
}
|
|
|
|
|
|
logalloc::occupancy_stats table::occupancy() const {
|
|
logalloc::occupancy_stats res;
|
|
for (auto m : *_memtables) {
|
|
res += m->region().occupancy();
|
|
}
|
|
return res;
|
|
}
|
|
|
|
|
|
// Snapshots: snapshotting the files themselves is easy: if more than one CF
|
|
// happens to link an SSTable twice, all but one will fail, and we will end up
|
|
// with one copy.
|
|
//
|
|
// The problem for us, is that the snapshot procedure is supposed to leave a
|
|
// manifest file inside its directory. So if we just call snapshot() from
|
|
// multiple shards, only the last one will succeed, writing its own SSTables to
|
|
// the manifest leaving all other shards' SSTables unaccounted for.
|
|
//
|
|
// Moreover, for things like drop table, the operation should only proceed when the
|
|
// snapshot is complete. That includes the manifest file being correctly written,
|
|
// and for this reason we need to wait for all shards to finish their snapshotting
|
|
// before we can move on.
|
|
//
|
|
// To know which files we must account for in the manifest, we will keep an
|
|
// SSTable set. Theoretically, we could just rescan the snapshot directory and
|
|
// see what's in there. But we would need to wait for all shards to finish
|
|
// before we can do that anyway. That is the hard part, and once that is done
|
|
// keeping the files set is not really a big deal.
|
|
//
|
|
// This code assumes that all shards will be snapshotting at the same time. So
|
|
// far this is a safe assumption, but if we ever want to take snapshots from a
|
|
// group of shards only, this code will have to be updated to account for that.
|
|
struct snapshot_manager {
|
|
std::unordered_set<sstring> files;
|
|
named_semaphore requests = {0, named_semaphore_exception_factory{"snapshot manager requests"}};
|
|
named_semaphore manifest_write = {0, named_semaphore_exception_factory{"snapshot manager manifest write"}};
|
|
snapshot_manager() {}
|
|
};
|
|
static thread_local std::unordered_map<sstring, lw_shared_ptr<snapshot_manager>> pending_snapshots;
|
|
|
|
static future<>
|
|
seal_snapshot(sstring jsondir) {
|
|
std::ostringstream ss;
|
|
int n = 0;
|
|
ss << "{" << std::endl << "\t\"files\" : [ ";
|
|
for (auto&& rf: pending_snapshots.at(jsondir)->files) {
|
|
if (n++ > 0) {
|
|
ss << ", ";
|
|
}
|
|
ss << "\"" << rf << "\"";
|
|
}
|
|
ss << " ]" << std::endl << "}" << std::endl;
|
|
|
|
auto json = ss.str();
|
|
auto jsonfile = jsondir + "/manifest.json";
|
|
|
|
tlogger.debug("Storing manifest {}", jsonfile);
|
|
|
|
return io_check([jsondir] { return recursive_touch_directory(jsondir); }).then([jsonfile, json = std::move(json)] {
|
|
return open_checked_file_dma(general_disk_error_handler, jsonfile, open_flags::wo | open_flags::create | open_flags::truncate).then([json](file f) {
|
|
return make_file_output_stream(std::move(f)).then([json](output_stream<char>&& out) {
|
|
return do_with(std::move(out), [json] (output_stream<char>& out) {
|
|
return out.write(json.c_str(), json.size()).then([&out] {
|
|
return out.flush();
|
|
}).then([&out] {
|
|
return out.close();
|
|
});
|
|
});
|
|
});
|
|
});
|
|
}).then([jsondir] {
|
|
return io_check(sync_directory, std::move(jsondir));
|
|
}).finally([jsondir] {
|
|
pending_snapshots.erase(jsondir);
|
|
return make_ready_future<>();
|
|
});
|
|
}
|
|
|
|
future<> table::write_schema_as_cql(database& db, sstring dir) const {
|
|
std::ostringstream ss;
|
|
try {
|
|
this->schema()->describe(db, ss);
|
|
} catch (...) {
|
|
return make_exception_future<>(std::current_exception());
|
|
}
|
|
auto schema_description = ss.str();
|
|
auto schema_file_name = dir + "/schema.cql";
|
|
return open_checked_file_dma(general_disk_error_handler, schema_file_name, open_flags::wo | open_flags::create | open_flags::truncate).then([schema_description = std::move(schema_description)](file f) {
|
|
return make_file_output_stream(std::move(f)).then([schema_description = std::move(schema_description)] (output_stream<char>&& out) mutable {
|
|
return do_with(std::move(out), [schema_description = std::move(schema_description)] (output_stream<char>& out) {
|
|
return out.write(schema_description.c_str(), schema_description.size()).then([&out] {
|
|
return out.flush();
|
|
}).then([&out] {
|
|
return out.close();
|
|
});
|
|
});
|
|
});
|
|
});
|
|
|
|
}
|
|
|
|
future<> table::snapshot(database& db, sstring name) {
|
|
return flush().then([this, &db, name = std::move(name)]() {
|
|
return with_semaphore(_sstable_deletion_sem, 1, [this, &db, name = std::move(name)]() {
|
|
// If the SSTables are shared, link this sstable to the snapshot directory only by one of the shards that own it.
|
|
auto& all = *_sstables->all();
|
|
std::vector<sstables::shared_sstable> tables;
|
|
tables.reserve(all.size());
|
|
for (auto& sst : all) {
|
|
const auto& shards = sst->get_shards_for_this_sstable();
|
|
if (shards.size() <= 1 || shards[0] == this_shard_id()) {
|
|
tables.emplace_back(sst);
|
|
}
|
|
}
|
|
auto jsondir = _config.datadir + "/snapshots/" + name;
|
|
return do_with(std::move(tables), std::move(jsondir), [this, &db] (std::vector<sstables::shared_sstable>& tables, const sstring& jsondir) {
|
|
return io_check([&jsondir] { return recursive_touch_directory(jsondir); }).then([this, &jsondir, &tables] {
|
|
return parallel_for_each(tables, [&jsondir] (sstables::shared_sstable sstable) {
|
|
return io_check([sstable, &dir = jsondir] {
|
|
return sstable->create_links(dir);
|
|
});
|
|
});
|
|
}).then([&jsondir, &tables] {
|
|
return io_check(sync_directory, jsondir);
|
|
}).finally([this, &tables, &db, &jsondir] {
|
|
auto shard = std::hash<sstring>()(jsondir) % smp::count;
|
|
std::unordered_set<sstring> table_names;
|
|
for (auto& sst : tables) {
|
|
auto f = sst->get_filename();
|
|
auto rf = f.substr(sst->get_dir().size() + 1);
|
|
table_names.insert(std::move(rf));
|
|
}
|
|
return smp::submit_to(shard, [requester = this_shard_id(), &jsondir, this, &db,
|
|
tables = std::move(table_names), datadir = _config.datadir] {
|
|
|
|
if (!pending_snapshots.contains(jsondir)) {
|
|
pending_snapshots.emplace(jsondir, make_lw_shared<snapshot_manager>());
|
|
}
|
|
auto snapshot = pending_snapshots.at(jsondir);
|
|
for (auto&& sst: tables) {
|
|
snapshot->files.insert(std::move(sst));
|
|
}
|
|
|
|
snapshot->requests.signal(1);
|
|
auto my_work = make_ready_future<>();
|
|
if (requester == this_shard_id()) {
|
|
my_work = snapshot->requests.wait(smp::count).then([&jsondir,
|
|
&db, snapshot, this] {
|
|
// this_shard_id() here == requester == this_shard_id() before submit_to() above,
|
|
// so the db reference is still local
|
|
return write_schema_as_cql(db, jsondir).handle_exception([&jsondir](std::exception_ptr ptr) {
|
|
tlogger.error("Failed writing schema file in snapshot in {} with exception {}", jsondir, ptr);
|
|
return make_ready_future<>();
|
|
}).finally([&jsondir, snapshot] () mutable {
|
|
return seal_snapshot(jsondir).then([snapshot] {
|
|
snapshot->manifest_write.signal(smp::count);
|
|
return make_ready_future<>();
|
|
});
|
|
});
|
|
});
|
|
}
|
|
return my_work.then([snapshot] {
|
|
return snapshot->manifest_write.wait(1);
|
|
}).then([snapshot] {});
|
|
});
|
|
});
|
|
});
|
|
});
|
|
});
|
|
}
|
|
|
|
future<bool> table::snapshot_exists(sstring tag) {
|
|
sstring jsondir = _config.datadir + "/snapshots/" + tag;
|
|
return open_checked_directory(general_disk_error_handler, std::move(jsondir)).then_wrapped([] (future<file> f) {
|
|
try {
|
|
f.get0();
|
|
return make_ready_future<bool>(true);
|
|
} catch (std::system_error& e) {
|
|
if (e.code() != std::error_code(ENOENT, std::system_category())) {
|
|
throw;
|
|
}
|
|
return make_ready_future<bool>(false);
|
|
}
|
|
});
|
|
}
|
|
|
|
future<std::unordered_map<sstring, table::snapshot_details>> table::get_snapshot_details() {
|
|
return seastar::async([this] {
|
|
std::unordered_map<sstring, snapshot_details> all_snapshots;
|
|
for (auto& datadir : _config.all_datadirs) {
|
|
fs::path snapshots_dir = fs::path(datadir) / "snapshots";
|
|
auto file_exists = io_check([&snapshots_dir] { return seastar::file_exists(snapshots_dir.native()); }).get0();
|
|
if (!file_exists) {
|
|
continue;
|
|
}
|
|
|
|
lister::scan_dir(snapshots_dir, { directory_entry_type::directory }, [this, datadir, &all_snapshots] (fs::path snapshots_dir, directory_entry de) {
|
|
auto snapshot_name = de.name;
|
|
all_snapshots.emplace(snapshot_name, snapshot_details());
|
|
return lister::scan_dir(snapshots_dir / fs::path(snapshot_name), { directory_entry_type::regular }, [this, datadir, &all_snapshots, snapshot_name] (fs::path snapshot_dir, directory_entry de) {
|
|
return io_check(file_size, (snapshot_dir / de.name).native()).then([this, datadir, &all_snapshots, snapshot_name, snapshot_dir, name = de.name] (auto size) {
|
|
// The manifest is the only file expected to be in this directory not belonging to the SSTable.
|
|
// For it, we account the total size, but zero it for the true size calculation.
|
|
//
|
|
// All the others should just generate an exception: there is something wrong, so don't blindly
|
|
// add it to the size.
|
|
if (name != "manifest.json" && name != "schema.cql") {
|
|
sstables::entry_descriptor::make_descriptor(snapshot_dir.native(), name);
|
|
all_snapshots.at(snapshot_name).total += size;
|
|
} else {
|
|
size = 0;
|
|
}
|
|
return io_check(file_size, (fs::path(datadir) / name).native()).then_wrapped([&all_snapshots, snapshot_name, size] (auto fut) {
|
|
try {
|
|
// File exists in the main SSTable directory. Snapshots are not contributing to size
|
|
fut.get0();
|
|
} catch (std::system_error& e) {
|
|
if (e.code() != std::error_code(ENOENT, std::system_category())) {
|
|
throw;
|
|
}
|
|
all_snapshots.at(snapshot_name).live += size;
|
|
}
|
|
return make_ready_future<>();
|
|
});
|
|
});
|
|
});
|
|
}).get();
|
|
}
|
|
return all_snapshots;
|
|
});
|
|
}
|
|
|
|
future<> table::flush() {
|
|
return _memtables->request_flush();
|
|
}
|
|
|
|
// FIXME: We can do much better than this in terms of cache management. Right
|
|
// now, we only have to flush the touched ranges because of the possibility of
|
|
// streaming containing token ownership changes.
|
|
//
|
|
// Right now we can't differentiate between that and a normal repair process,
|
|
// so we always flush. When we can differentiate those streams, we should not
|
|
// be indiscriminately touching the cache during repair. We will just have to
|
|
// invalidate the entries that are relevant to things we already have in the cache.
|
|
future<> table::flush_streaming_mutations(utils::UUID plan_id, dht::partition_range_vector ranges) {
|
|
tlogger.debug("Flushing streaming memtable, plan={}", plan_id);
|
|
return with_gate(_streaming_flush_gate, [this, plan_id, ranges = std::move(ranges)] () mutable {
|
|
return _streaming_flush_phaser.advance_and_await();
|
|
});
|
|
}
|
|
|
|
future<> table::clear() {
|
|
if (_commitlog) {
|
|
_commitlog->discard_completed_segments(_schema->id());
|
|
}
|
|
_memtables->clear();
|
|
_memtables->add_memtable();
|
|
return _cache.invalidate([] { /* There is no underlying mutation source */ });
|
|
}
|
|
|
|
// NOTE: does not need to be futurized, but might eventually, depending on
|
|
// if we implement notifications, whatnot.
|
|
future<db::replay_position> table::discard_sstables(db_clock::time_point truncated_at) {
|
|
assert(_compaction_disabled > 0);
|
|
|
|
struct pruner {
|
|
column_family& cf;
|
|
db::replay_position rp;
|
|
std::vector<sstables::shared_sstable> remove;
|
|
|
|
pruner(column_family& cf)
|
|
: cf(cf) {}
|
|
|
|
void prune(db_clock::time_point truncated_at) {
|
|
auto gc_trunc = to_gc_clock(truncated_at);
|
|
|
|
auto pruned = make_lw_shared<sstables::sstable_set>(cf._compaction_strategy.make_sstable_set(cf._schema));
|
|
|
|
for (auto& p : *cf._sstables->all()) {
|
|
if (p->max_data_age() <= gc_trunc) {
|
|
rp = std::max(p->get_stats_metadata().position, rp);
|
|
remove.emplace_back(p);
|
|
continue;
|
|
}
|
|
pruned->insert(p);
|
|
}
|
|
|
|
cf._sstables = std::move(pruned);
|
|
}
|
|
};
|
|
auto p = make_lw_shared<pruner>(*this);
|
|
return _cache.invalidate([p, truncated_at] {
|
|
p->prune(truncated_at);
|
|
tlogger.debug("cleaning out row cache");
|
|
}).then([this, p]() mutable {
|
|
rebuild_statistics();
|
|
|
|
return parallel_for_each(p->remove, [this](sstables::shared_sstable s) {
|
|
remove_sstable_from_backlog_tracker(_compaction_strategy.get_backlog_tracker(), s);
|
|
return sstables::delete_atomically({s});
|
|
}).then([p] {
|
|
return make_ready_future<db::replay_position>(p->rp);
|
|
});
|
|
});
|
|
}
|
|
|
|
void table::set_schema(schema_ptr s) {
|
|
assert(s->is_counter() == _schema->is_counter());
|
|
tlogger.debug("Changing schema version of {}.{} ({}) from {} to {}",
|
|
_schema->ks_name(), _schema->cf_name(), _schema->id(), _schema->version(), s->version());
|
|
|
|
for (auto& m : *_memtables) {
|
|
m->set_schema(s);
|
|
}
|
|
|
|
_cache.set_schema(s);
|
|
if (_counter_cell_locks) {
|
|
_counter_cell_locks->set_schema(s);
|
|
}
|
|
_schema = std::move(s);
|
|
|
|
set_compaction_strategy(_schema->compaction_strategy());
|
|
trigger_compaction();
|
|
}
|
|
|
|
static std::vector<view_ptr>::iterator find_view(std::vector<view_ptr>& views, const view_ptr& v) {
|
|
return std::find_if(views.begin(), views.end(), [&v] (auto&& e) {
|
|
return e->id() == v->id();
|
|
});
|
|
}
|
|
|
|
void table::add_or_update_view(view_ptr v) {
|
|
v->view_info()->initialize_base_dependent_fields(*schema());
|
|
auto existing = find_view(_views, v);
|
|
if (existing != _views.end()) {
|
|
*existing = std::move(v);
|
|
} else {
|
|
_views.push_back(std::move(v));
|
|
}
|
|
}
|
|
|
|
void table::remove_view(view_ptr v) {
|
|
auto existing = find_view(_views, v);
|
|
if (existing != _views.end()) {
|
|
_views.erase(existing);
|
|
}
|
|
}
|
|
|
|
void table::clear_views() {
|
|
_views.clear();
|
|
}
|
|
|
|
const std::vector<view_ptr>& table::views() const {
|
|
return _views;
|
|
}
|
|
|
|
std::vector<view_ptr> table::affected_views(const schema_ptr& base, const mutation& update, gc_clock::time_point now) const {
|
|
//FIXME: Avoid allocating a vector here; consider returning the boost iterator.
|
|
return boost::copy_range<std::vector<view_ptr>>(_views | boost::adaptors::filtered([&, this] (auto&& view) {
|
|
return db::view::partition_key_matches(*base, *view->view_info(), update.decorated_key(), now);
|
|
}));
|
|
}
|
|
|
|
static size_t memory_usage_of(const std::vector<frozen_mutation_and_schema>& ms) {
|
|
// Overhead of sending a view mutation, in terms of data structures used by the storage_proxy.
|
|
constexpr size_t base_overhead_bytes = 256;
|
|
return boost::accumulate(ms | boost::adaptors::transformed([] (const frozen_mutation_and_schema& m) {
|
|
return m.fm.representation().size();
|
|
}), size_t{base_overhead_bytes * ms.size()});
|
|
}
|
|
|
|
/**
|
|
* Given some updates on the base table and the existing values for the rows affected by that update, generates the
|
|
* mutations to be applied to the base table's views, and sends them to the paired view replicas.
|
|
*
|
|
* @param base the base schema at a particular version.
|
|
* @param views the affected views which need to be updated.
|
|
* @param updates the base table updates being applied.
|
|
* @param existings the existing values for the rows affected by updates. This is used to decide if a view is
|
|
* obsoleted by the update and should be removed, gather the values for columns that may not be part of the update if
|
|
* a new view entry needs to be created, and compute the minimal updates to be applied if the view entry isn't changed
|
|
* but has simply some updated values.
|
|
* @return a future resolving to the mutations to apply to the views, which can be empty.
|
|
*/
|
|
future<> table::generate_and_propagate_view_updates(const schema_ptr& base,
|
|
std::vector<view_ptr>&& views,
|
|
mutation&& m,
|
|
flat_mutation_reader_opt existings,
|
|
tracing::trace_state_ptr tr_state,
|
|
gc_clock::time_point now) const {
|
|
auto base_token = m.token();
|
|
return db::view::generate_view_updates(
|
|
base,
|
|
std::move(views),
|
|
flat_mutation_reader_from_mutations({std::move(m)}),
|
|
std::move(existings),
|
|
now).then([this, base_token = std::move(base_token), tr_state = std::move(tr_state)] (std::vector<frozen_mutation_and_schema>&& updates) mutable {
|
|
tracing::trace(tr_state, "Generated {} view update mutations", updates.size());
|
|
auto units = seastar::consume_units(*_config.view_update_concurrency_semaphore, memory_usage_of(updates));
|
|
return db::view::mutate_MV(std::move(base_token), std::move(updates), _view_stats, *_config.cf_stats, std::move(tr_state),
|
|
std::move(units), service::allow_hints::yes, db::view::wait_for_all_updates::no).handle_exception([] (auto ignored) { });
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Shard-local locking of clustering rows or entire partitions of the base
|
|
* table during a Materialized-View read-modify-update:
|
|
*
|
|
* Consider that two concurrent base-table updates set column C, a column
|
|
* added to a view's primary key, to two different values - V1 and V2.
|
|
* Say that that before the updates, C's value was V0. Both updates may remove
|
|
* from the view the old row with V0, one will add a view row with V1 and the
|
|
* second will add a view row with V2, and we end up with two rows, with the
|
|
* two different values, instead of just one row with the last value.
|
|
*
|
|
* The solution is to lock the base row which we read to ensure atomic read-
|
|
* modify-write to the view table: Under one locked section, the row with V0
|
|
* is deleted and a new one with V1 is created, and then under a second locked
|
|
* section the row with V1 is deleted and a new one with V2 is created.
|
|
* Note that the lock is node-local (and in fact shard-local) and the locked
|
|
* section doesn't include the view table modifications - it includes just the
|
|
* read and the creation of the update commands - commands which will
|
|
* eventually be sent to the view replicas.
|
|
*
|
|
* We need to lock a base-table row even if an update does not modify the
|
|
* view's new key column C: Consider an update that only updates a non-key
|
|
* column (but also in the view) D. We still need to read the current base row
|
|
* to retrieve the view row's current key (column C), and then write the
|
|
* modification to *that* view row. Having several such modifications in
|
|
* parallel is fine. What is not fine is to have in parallel a modification
|
|
* of the value of C. So basically we need a reader-writer lock (a.k.a.
|
|
* shared-exclusive lock) on base rows:
|
|
* 1. Updates which do not modify the view's key column take a reader lock
|
|
* on the base row.
|
|
* 2. Updates which do modify the view's key column take a writer lock.
|
|
*
|
|
* Further complicating matters is that some operations involve multiple
|
|
* base rows - such as a deletion of an entire partition or a range of rows.
|
|
* In that case, we should lock the entire partition, and forbid parallel
|
|
* work on the same partition or one of its rows. We can do this with a
|
|
* read-writer lock on base partitions:
|
|
* 1. Before we lock a row (as described above), we lock its partition key
|
|
* with the reader lock.
|
|
* 2. When an operation involves an entire partition (or range of rows),
|
|
* we lock the partition key with a writer lock.
|
|
*
|
|
* If an operation involves only a range of rows, not an entire partition,
|
|
* we could in theory lock only this range and not an entire partition.
|
|
* However, we expect this case to be rare enough to not care about and we
|
|
* currently just lock the entire partition.
|
|
*
|
|
* If a base table has *multiple* views, we still read the base table row
|
|
* only once, and have to keep a lock around this read and all the view
|
|
* updates generation. This lock needs to be the strictest of the above -
|
|
* i.e., if a column is modified which is not part of one view's key but is
|
|
* part of a second view's key - we should lock the base row with the
|
|
* stricter writer lock, not a reader lock.
|
|
*/
|
|
future<row_locker::lock_holder>
|
|
table::local_base_lock(
|
|
const schema_ptr& s,
|
|
const dht::decorated_key& pk,
|
|
const query::clustering_row_ranges& rows,
|
|
db::timeout_clock::time_point timeout) const {
|
|
// FIXME: Optimization:
|
|
// Below we always pass "true" to the lock functions and take an exclusive
|
|
// lock on the affected row or partition. But as explained above, if all
|
|
// the modified columns are not key columns in *any* of the views, and
|
|
// shared lock is enough. We should test for this case and pass false.
|
|
// This will allow more parallelism in concurrent modifications to the
|
|
// same row - probably not a very urgent case.
|
|
_row_locker.upgrade(s);
|
|
if (rows.size() == 1 && rows[0].is_singular() && rows[0].start() && !rows[0].start()->value().is_empty(*s)) {
|
|
// A single clustering row is involved.
|
|
return _row_locker.lock_ck(pk, rows[0].start()->value(), true, timeout, _row_locker_stats);
|
|
} else {
|
|
// More than a single clustering row is involved. Most commonly it's
|
|
// the entire partition, so let's lock the entire partition. We could
|
|
// lock less than the entire partition in more elaborate cases where
|
|
// just a few individual rows are involved, or row ranges, but we
|
|
// don't think this will make a practical difference.
|
|
return _row_locker.lock_pk(pk, true, timeout, _row_locker_stats);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Given some updates on the base table and assuming there are no pre-existing, overlapping updates,
|
|
* generates the mutations to be applied to the base table's views, and sends them to the paired
|
|
* view replicas. The future resolves when the updates have been acknowledged by the repicas, i.e.,
|
|
* propagating the view updates to the view replicas happens synchronously.
|
|
*
|
|
* @param views the affected views which need to be updated.
|
|
* @param base_token The token to use to match the base replica with the paired replicas.
|
|
* @param reader the base table updates being applied, which all correspond to the base token.
|
|
* @return a future that resolves when the updates have been acknowledged by the view replicas
|
|
*/
|
|
future<> table::populate_views(
|
|
std::vector<view_ptr> views,
|
|
dht::token base_token,
|
|
flat_mutation_reader&& reader,
|
|
gc_clock::time_point now) {
|
|
auto& schema = reader.schema();
|
|
return db::view::generate_view_updates(
|
|
schema,
|
|
std::move(views),
|
|
std::move(reader),
|
|
{ },
|
|
now).then([base_token = std::move(base_token), this] (std::vector<frozen_mutation_and_schema>&& updates) mutable {
|
|
size_t update_size = memory_usage_of(updates);
|
|
size_t units_to_wait_for = std::min(_config.view_update_concurrency_semaphore_limit, update_size);
|
|
return seastar::get_units(*_config.view_update_concurrency_semaphore, units_to_wait_for).then(
|
|
[base_token = std::move(base_token),
|
|
updates = std::move(updates),
|
|
units_to_consume = update_size - units_to_wait_for,
|
|
this] (db::timeout_semaphore_units&& units) mutable {
|
|
units.adopt(seastar::consume_units(*_config.view_update_concurrency_semaphore, units_to_consume));
|
|
return db::view::mutate_MV(std::move(base_token), std::move(updates), _view_stats, *_config.cf_stats,
|
|
tracing::trace_state_ptr(), std::move(units), service::allow_hints::no, db::view::wait_for_all_updates::yes);
|
|
});
|
|
});
|
|
}
|
|
|
|
void table::set_hit_rate(gms::inet_address addr, cache_temperature rate) {
|
|
auto& e = _cluster_cache_hit_rates[addr];
|
|
e.rate = rate;
|
|
e.last_updated = lowres_clock::now();
|
|
}
|
|
|
|
table::cache_hit_rate table::get_hit_rate(gms::inet_address addr) {
|
|
auto it = _cluster_cache_hit_rates.find(addr);
|
|
if (utils::fb_utilities::get_broadcast_address() == addr) {
|
|
return cache_hit_rate { _global_cache_hit_rate, lowres_clock::now()};
|
|
}
|
|
if (it == _cluster_cache_hit_rates.end()) {
|
|
// no data yet, get it from the gossiper
|
|
auto& gossiper = gms::get_local_gossiper();
|
|
auto* eps = gossiper.get_endpoint_state_for_endpoint_ptr(addr);
|
|
if (eps) {
|
|
auto* state = eps->get_application_state_ptr(gms::application_state::CACHE_HITRATES);
|
|
float f = -1.0f; // missing state means old node
|
|
if (state) {
|
|
sstring me = format("{}.{}", _schema->ks_name(), _schema->cf_name());
|
|
auto i = state->value.find(me);
|
|
if (i != sstring::npos) {
|
|
f = strtof(&state->value[i + me.size() + 1], nullptr);
|
|
} else {
|
|
f = 0.0f; // empty state means that node has rebooted
|
|
}
|
|
set_hit_rate(addr, cache_temperature(f));
|
|
return cache_hit_rate{cache_temperature(f), lowres_clock::now()};
|
|
}
|
|
}
|
|
return cache_hit_rate {cache_temperature(0.0f), lowres_clock::now()};
|
|
} else {
|
|
return it->second;
|
|
}
|
|
}
|
|
|
|
void table::drop_hit_rate(gms::inet_address addr) {
|
|
_cluster_cache_hit_rates.erase(addr);
|
|
}
|
|
|
|
void
|
|
table::check_valid_rp(const db::replay_position& rp) const {
|
|
if (rp != db::replay_position() && rp < _lowest_allowed_rp) {
|
|
throw mutation_reordered_with_truncate_exception();
|
|
}
|
|
}
|
|
|
|
db::replay_position table::set_low_replay_position_mark() {
|
|
_lowest_allowed_rp = _highest_rp;
|
|
return _lowest_allowed_rp;
|
|
}
|
|
|
|
template<typename... Args>
|
|
void table::do_apply(db::rp_handle&& h, Args&&... args) {
|
|
utils::latency_counter lc;
|
|
_stats.writes.set_latency(lc);
|
|
db::replay_position rp = h;
|
|
check_valid_rp(rp);
|
|
try {
|
|
_memtables->active_memtable().apply(std::forward<Args>(args)..., std::move(h));
|
|
_highest_rp = std::max(_highest_rp, rp);
|
|
} catch (...) {
|
|
_failed_counter_applies_to_memtable++;
|
|
throw;
|
|
}
|
|
_stats.writes.mark(lc);
|
|
if (lc.is_start()) {
|
|
_stats.estimated_write.add(lc.latency());
|
|
}
|
|
}
|
|
|
|
void
|
|
table::apply(const mutation& m, db::rp_handle&& h) {
|
|
do_apply(std::move(h), m);
|
|
}
|
|
|
|
void
|
|
table::apply(const frozen_mutation& m, const schema_ptr& m_schema, db::rp_handle&& h) {
|
|
do_apply(std::move(h), m, m_schema);
|
|
}
|
|
|
|
future<>
|
|
write_memtable_to_sstable(memtable& mt, sstables::shared_sstable sst,
|
|
sstables::write_monitor& monitor,
|
|
sstables::sstable_writer_config& cfg,
|
|
const io_priority_class& pc) {
|
|
cfg.replay_position = mt.replay_position();
|
|
cfg.monitor = &monitor;
|
|
return sst->write_components(mt.make_flush_reader(mt.schema(), pc), mt.partition_count(),
|
|
mt.schema(), cfg, mt.get_encoding_stats(), pc);
|
|
}
|
|
|
|
future<>
|
|
write_memtable_to_sstable(memtable& mt, sstables::shared_sstable sst, sstables::sstable_writer_config cfg) {
|
|
return do_with(permit_monitor(sstable_write_permit::unconditional()), cfg, [&mt, sst] (auto& monitor, auto& cfg) {
|
|
return write_memtable_to_sstable(mt, std::move(sst), monitor, cfg);
|
|
});
|
|
}
|
|
|
|
|
|
struct query_state {
|
|
explicit query_state(schema_ptr s,
|
|
const query::read_command& cmd,
|
|
query::result_options opts,
|
|
const dht::partition_range_vector& ranges,
|
|
query::result_memory_accounter memory_accounter)
|
|
: schema(std::move(s))
|
|
, cmd(cmd)
|
|
, builder(cmd.slice, opts, std::move(memory_accounter))
|
|
, limit(cmd.get_row_limit())
|
|
, partition_limit(cmd.partition_limit)
|
|
, current_partition_range(ranges.begin())
|
|
, range_end(ranges.end()){
|
|
}
|
|
schema_ptr schema;
|
|
const query::read_command& cmd;
|
|
query::result::builder builder;
|
|
uint64_t limit;
|
|
uint32_t partition_limit;
|
|
bool range_empty = false; // Avoid ubsan false-positive when moving after construction
|
|
dht::partition_range_vector::const_iterator current_partition_range;
|
|
dht::partition_range_vector::const_iterator range_end;
|
|
uint64_t remaining_rows() const {
|
|
return limit - builder.row_count();
|
|
}
|
|
uint32_t remaining_partitions() const {
|
|
return partition_limit - builder.partition_count();
|
|
}
|
|
bool done() const {
|
|
return !remaining_rows() || !remaining_partitions() || current_partition_range == range_end || builder.is_short_read();
|
|
}
|
|
};
|
|
|
|
future<lw_shared_ptr<query::result>>
|
|
table::query(schema_ptr s,
|
|
const query::read_command& cmd,
|
|
query::query_class_config class_config,
|
|
query::result_options opts,
|
|
const dht::partition_range_vector& partition_ranges,
|
|
tracing::trace_state_ptr trace_state,
|
|
query::result_memory_limiter& memory_limiter,
|
|
db::timeout_clock::time_point timeout,
|
|
query::querier_cache_context cache_ctx) {
|
|
utils::latency_counter lc;
|
|
_stats.reads.set_latency(lc);
|
|
const auto short_read_allwoed = query::short_read(cmd.slice.options.contains<query::partition_slice::option::allow_short_read>());
|
|
auto f = opts.request == query::result_request::only_digest
|
|
? memory_limiter.new_digest_read(*cmd.max_result_size, short_read_allwoed) : memory_limiter.new_data_read(*cmd.max_result_size, short_read_allwoed);
|
|
return f.then([this, lc, s = std::move(s), &cmd, class_config, opts, &partition_ranges,
|
|
trace_state = std::move(trace_state), timeout, cache_ctx = std::move(cache_ctx)] (query::result_memory_accounter accounter) mutable {
|
|
auto qs_ptr = std::make_unique<query_state>(std::move(s), cmd, opts, partition_ranges, std::move(accounter));
|
|
auto& qs = *qs_ptr;
|
|
return do_until(std::bind(&query_state::done, &qs), [this, &qs, class_config, trace_state = std::move(trace_state), timeout, cache_ctx = std::move(cache_ctx)] {
|
|
auto&& range = *qs.current_partition_range++;
|
|
return data_query(qs.schema, as_mutation_source(), range, qs.cmd.slice, qs.remaining_rows(),
|
|
qs.remaining_partitions(), qs.cmd.timestamp, qs.builder, timeout, class_config, trace_state, cache_ctx);
|
|
}).then([qs_ptr = std::move(qs_ptr), &qs] {
|
|
return make_ready_future<lw_shared_ptr<query::result>>(
|
|
make_lw_shared<query::result>(qs.builder.build()));
|
|
}).finally([lc, this]() mutable {
|
|
_stats.reads.mark(lc);
|
|
if (lc.is_start()) {
|
|
_stats.estimated_read.add(lc.latency());
|
|
}
|
|
});
|
|
});
|
|
}
|
|
|
|
mutation_source
|
|
table::as_mutation_source() const {
|
|
return mutation_source([this] (schema_ptr s,
|
|
reader_permit permit,
|
|
const dht::partition_range& range,
|
|
const query::partition_slice& slice,
|
|
const io_priority_class& pc,
|
|
tracing::trace_state_ptr trace_state,
|
|
streamed_mutation::forwarding fwd,
|
|
mutation_reader::forwarding fwd_mr) {
|
|
return this->make_reader(std::move(s), std::move(permit), range, slice, pc, std::move(trace_state), fwd, fwd_mr);
|
|
});
|
|
}
|
|
|
|
void table::add_coordinator_read_latency(utils::estimated_histogram::duration latency) {
|
|
_stats.estimated_coordinator_read.add(std::chrono::duration_cast<std::chrono::microseconds>(latency).count());
|
|
}
|
|
|
|
std::chrono::milliseconds table::get_coordinator_read_latency_percentile(double percentile) {
|
|
if (_cached_percentile != percentile || lowres_clock::now() - _percentile_cache_timestamp > 1s) {
|
|
_percentile_cache_timestamp = lowres_clock::now();
|
|
_cached_percentile = percentile;
|
|
_percentile_cache_value = std::max(_stats.estimated_coordinator_read.percentile(percentile) / 1000, int64_t(1)) * 1ms;
|
|
_stats.estimated_coordinator_read *= 0.9; // decay values a little to give new data points more weight
|
|
}
|
|
return _percentile_cache_value;
|
|
}
|
|
|
|
future<>
|
|
table::run_with_compaction_disabled(std::function<future<> ()> func) {
|
|
++_compaction_disabled;
|
|
return _compaction_manager.remove(this).then(std::move(func)).finally([this] {
|
|
if (--_compaction_disabled == 0) {
|
|
// we're turning if on again, use function that does not increment
|
|
// the counter further.
|
|
do_trigger_compaction();
|
|
}
|
|
});
|
|
}
|
|
|
|
void
|
|
table::enable_auto_compaction() {
|
|
// XXX: unmute backlog. turn table backlog back on.
|
|
// see table::disable_auto_compaction() notes.
|
|
_compaction_disabled_by_user = false;
|
|
}
|
|
|
|
void
|
|
table::disable_auto_compaction() {
|
|
// XXX: mute backlog. When we disable background compactions
|
|
// for the table, we must also disable current backlog of the
|
|
// table compaction strategy that contributes to the scheduling
|
|
// group resources prioritization.
|
|
//
|
|
// There are 2 possibilities possible:
|
|
// - there are no ongoing background compaction, and we can freely
|
|
// mute table backlog.
|
|
// - there are compactions happening. than we must decide either
|
|
// we want to allow them to finish not allowing submitting new
|
|
// compactions tasks, or we may "suspend" them until the bg
|
|
// compactions will be enabled back. This is not a worst option
|
|
// because it will allow bg compactions to finish if there are
|
|
// unused resourced, it will not lose any writers/readers stats.
|
|
//
|
|
// Besides that:
|
|
// - there are major compactions that additionally uses constant
|
|
// size backlog of shares,
|
|
// - sstables rewrites tasks that do the same.
|
|
//
|
|
// Setting NullCompactionStrategy is not an option due to the
|
|
// following reasons:
|
|
// - it will 0 backlog if suspending current compactions is not an
|
|
// option
|
|
// - it will break computation of major compaction descriptor
|
|
// for new submissions
|
|
_compaction_disabled_by_user = true;
|
|
}
|
|
|
|
flat_mutation_reader
|
|
table::make_reader_excluding_sstables(schema_ptr s,
|
|
reader_permit permit,
|
|
std::vector<sstables::shared_sstable>& excluded,
|
|
const dht::partition_range& range,
|
|
const query::partition_slice& slice,
|
|
const io_priority_class& pc,
|
|
tracing::trace_state_ptr trace_state,
|
|
streamed_mutation::forwarding fwd,
|
|
mutation_reader::forwarding fwd_mr) const {
|
|
std::vector<flat_mutation_reader> readers;
|
|
readers.reserve(_memtables->size() + 1);
|
|
|
|
for (auto&& mt : *_memtables) {
|
|
readers.emplace_back(mt->make_flat_reader(s, permit, range, slice, pc, trace_state, fwd, fwd_mr));
|
|
}
|
|
|
|
auto effective_sstables = ::make_lw_shared<sstables::sstable_set>(*_sstables);
|
|
for (auto& sst : excluded) {
|
|
effective_sstables->erase(sst);
|
|
}
|
|
|
|
readers.emplace_back(make_sstable_reader(s, permit, std::move(effective_sstables), range, slice, pc, std::move(trace_state), fwd, fwd_mr));
|
|
return make_combined_reader(s, std::move(readers), fwd, fwd_mr);
|
|
}
|
|
|
|
future<> table::move_sstables_from_staging(std::vector<sstables::shared_sstable> sstables) {
|
|
return with_semaphore(_sstable_deletion_sem, 1, [this, sstables = std::move(sstables)] {
|
|
return do_with(std::set<sstring>({dir()}), std::move(sstables), [this] (std::set<sstring>& dirs_to_sync, std::vector<sstables::shared_sstable>& sstables) {
|
|
return do_for_each(sstables, [this, &dirs_to_sync] (sstables::shared_sstable sst) {
|
|
dirs_to_sync.emplace(sst->get_dir());
|
|
return sst->move_to_new_dir(dir(), sst->generation(), false).then_wrapped([this, sst, &dirs_to_sync] (future<> f) {
|
|
if (!f.failed()) {
|
|
_sstables_staging.erase(sst->generation());
|
|
add_sstable_to_backlog_tracker(_compaction_strategy.get_backlog_tracker(), sst);
|
|
return make_ready_future<>();
|
|
} else {
|
|
auto ep = f.get_exception();
|
|
tlogger.warn("Failed to move sstable {} from staging: {}", sst->get_filename(), ep);
|
|
return make_exception_future<>(ep);
|
|
}
|
|
});
|
|
}).finally([&dirs_to_sync] {
|
|
return parallel_for_each(dirs_to_sync, [] (sstring dir) {
|
|
return sync_directory(dir);
|
|
});
|
|
});
|
|
});
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Given an update for the base table, calculates the set of potentially affected views,
|
|
* generates the relevant updates, and sends them to the paired view replicas.
|
|
*/
|
|
future<row_locker::lock_holder> table::push_view_replica_updates(const schema_ptr& s, const frozen_mutation& fm,
|
|
db::timeout_clock::time_point timeout, tracing::trace_state_ptr tr_state, reader_concurrency_semaphore& sem) const {
|
|
//FIXME: Avoid unfreezing here.
|
|
auto m = fm.unfreeze(s);
|
|
return push_view_replica_updates(s, std::move(m), timeout, std::move(tr_state), sem);
|
|
}
|
|
|
|
future<row_locker::lock_holder> table::do_push_view_replica_updates(const schema_ptr& s, mutation&& m, db::timeout_clock::time_point timeout, mutation_source&& source,
|
|
tracing::trace_state_ptr tr_state, reader_concurrency_semaphore& sem, const io_priority_class& io_priority, query::partition_slice::option_set custom_opts) const {
|
|
if (!_config.view_update_concurrency_semaphore->current()) {
|
|
// We don't have resources to generate view updates for this write. If we reached this point, we failed to
|
|
// throttle the client. The memory queue is already full, waiting on the semaphore would cause this node to
|
|
// run out of memory, and generating hints would ultimately result in the disk queue being full too. We don't
|
|
// drop the base write, which could create inconsistencies between base replicas. So we dolefully continue,
|
|
// and note the fact we dropped a view update.
|
|
++_config.cf_stats->dropped_view_updates;
|
|
return make_ready_future<row_locker::lock_holder>();
|
|
}
|
|
auto& base = schema();
|
|
m.upgrade(base);
|
|
gc_clock::time_point now = gc_clock::now();
|
|
utils::get_local_injector().inject("table_push_view_replica_updates_stale_time_point", [&now] {
|
|
now -= 10s;
|
|
});
|
|
auto views = affected_views(base, m, now);
|
|
if (views.empty()) {
|
|
return make_ready_future<row_locker::lock_holder>();
|
|
}
|
|
auto cr_ranges = db::view::calculate_affected_clustering_ranges(*base, m.decorated_key(), m.partition(), views, now);
|
|
if (cr_ranges.empty()) {
|
|
tracing::trace(tr_state, "View updates do not require read-before-write");
|
|
return generate_and_propagate_view_updates(base, std::move(views), std::move(m), { }, std::move(tr_state), now).then([] {
|
|
// In this case we are not doing a read-before-write, just a
|
|
// write, so no lock is needed.
|
|
return make_ready_future<row_locker::lock_holder>();
|
|
});
|
|
}
|
|
// We read the whole set of regular columns in case the update now causes a base row to pass
|
|
// a view's filters, and a view happens to include columns that have no value in this update.
|
|
// Also, one of those columns can determine the lifetime of the base row, if it has a TTL.
|
|
auto columns = boost::copy_range<query::column_id_vector>(
|
|
base->regular_columns() | boost::adaptors::transformed(std::mem_fn(&column_definition::id)));
|
|
query::partition_slice::option_set opts;
|
|
opts.set(query::partition_slice::option::send_partition_key);
|
|
opts.set(query::partition_slice::option::send_clustering_key);
|
|
opts.set(query::partition_slice::option::send_timestamp);
|
|
opts.set(query::partition_slice::option::send_ttl);
|
|
opts.add(custom_opts);
|
|
auto slice = query::partition_slice(
|
|
std::move(cr_ranges), { }, std::move(columns), std::move(opts), { }, cql_serialization_format::internal(), query::max_rows);
|
|
// Take the shard-local lock on the base-table row or partition as needed.
|
|
// We'll return this lock to the caller, which will release it after
|
|
// writing the base-table update.
|
|
future<row_locker::lock_holder> lockf = local_base_lock(base, m.decorated_key(), slice.default_row_ranges(), timeout);
|
|
return utils::get_local_injector().inject("table_push_view_replica_updates_timeout", timeout).then([lockf = std::move(lockf), timeout] () mutable {
|
|
return std::move(lockf);
|
|
}).then([m = std::move(m), slice = std::move(slice), views = std::move(views), base, this, timeout, now, source = std::move(source), &sem, tr_state = std::move(tr_state), &io_priority] (row_locker::lock_holder lock) mutable {
|
|
return do_with(
|
|
dht::partition_range::make_singular(m.decorated_key()),
|
|
std::move(slice),
|
|
std::move(m),
|
|
[base, views = std::move(views), lock = std::move(lock), this, timeout, now, source = std::move(source), &sem, &io_priority, tr_state = std::move(tr_state)] (auto& pk, auto& slice, auto& m) mutable {
|
|
auto reader = source.make_reader(base, sem.make_permit(), pk, slice, io_priority, tr_state, streamed_mutation::forwarding::no, mutation_reader::forwarding::no);
|
|
return this->generate_and_propagate_view_updates(base, std::move(views), std::move(m), std::move(reader), tr_state, now).then([base, tr_state = std::move(tr_state), lock = std::move(lock)] () mutable {
|
|
tracing::trace(tr_state, "View updates for {}.{} were generated and propagated", base->ks_name(), base->cf_name());
|
|
// return the local partition/row lock we have taken so it
|
|
// remains locked until the caller is done modifying this
|
|
// partition/row and destroys the lock object.
|
|
return std::move(lock);
|
|
});
|
|
});
|
|
});
|
|
}
|
|
|
|
future<row_locker::lock_holder> table::push_view_replica_updates(const schema_ptr& s, mutation&& m, db::timeout_clock::time_point timeout,
|
|
tracing::trace_state_ptr tr_state, reader_concurrency_semaphore& sem) const {
|
|
return do_push_view_replica_updates(s, std::move(m), timeout, as_mutation_source(),
|
|
std::move(tr_state), sem, service::get_local_sstable_query_read_priority(), {});
|
|
}
|
|
|
|
future<row_locker::lock_holder>
|
|
table::stream_view_replica_updates(const schema_ptr& s, mutation&& m, db::timeout_clock::time_point timeout,
|
|
std::vector<sstables::shared_sstable>& excluded_sstables) const {
|
|
return do_push_view_replica_updates(
|
|
s,
|
|
std::move(m),
|
|
timeout,
|
|
as_mutation_source_excluding(excluded_sstables),
|
|
tracing::trace_state_ptr(),
|
|
*_config.streaming_read_concurrency_semaphore,
|
|
service::get_local_streaming_priority(),
|
|
query::partition_slice::option_set::of<query::partition_slice::option::bypass_cache>());
|
|
}
|
|
|
|
mutation_source
|
|
table::as_mutation_source_excluding(std::vector<sstables::shared_sstable>& ssts) const {
|
|
return mutation_source([this, &ssts] (schema_ptr s,
|
|
reader_permit permit,
|
|
const dht::partition_range& range,
|
|
const query::partition_slice& slice,
|
|
const io_priority_class& pc,
|
|
tracing::trace_state_ptr trace_state,
|
|
streamed_mutation::forwarding fwd,
|
|
mutation_reader::forwarding fwd_mr) {
|
|
return this->make_reader_excluding_sstables(std::move(s), std::move(permit), ssts, range, slice, pc, std::move(trace_state), fwd, fwd_mr);
|
|
});
|
|
}
|