d41fcd45d1
The LSA memory pressure mechanism will let us know which region is the best candidate for eviction when under pressure. We need to somehow then translate region -> memtable -> column family. The easiest way to convert from region to memtable, is having memtable inherit from region. Despite the fact that this requires multiple inheritance, which always raise a flag a bit, the other class we inherit from is enable_shared_from_this, which has a very simple and well defined interface. So I think it is worthy for us to do it. Once we have the memtable, grabing the column family is easy provided we have a database object. We can grab it from the schema. Signed-off-by: Glauber Costa <glauber@scylladb.com>
329 lines
12 KiB
C++
329 lines
12 KiB
C++
/*
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* Copyright (C) 2014 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 "memtable.hh"
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#include "frozen_mutation.hh"
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#include "sstable_mutation_readers.hh"
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namespace stdx = std::experimental;
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memtable::memtable(schema_ptr schema, logalloc::region_group* dirty_memory_region_group)
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: logalloc::region(dirty_memory_region_group ? logalloc::region(*dirty_memory_region_group) : logalloc::region())
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, _schema(std::move(schema))
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, partitions(memtable_entry::compare(_schema)) {
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}
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memtable::~memtable() {
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with_allocator(allocator(), [this] {
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partitions.clear_and_dispose(current_deleter<memtable_entry>());
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});
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}
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partition_entry&
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memtable::find_or_create_partition_slow(partition_key_view key) {
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assert(!reclaiming_enabled());
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// FIXME: Perform lookup using std::pair<token, partition_key_view>
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// to avoid unconditional copy of the partition key.
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// We can't do it right now because std::map<> which holds
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// partitions doesn't support heterogeneous lookup.
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// We could switch to boost::intrusive_map<> similar to what we have for row keys.
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auto& outer = current_allocator();
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return with_allocator(standard_allocator(), [&, this] () -> partition_entry& {
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auto dk = dht::global_partitioner().decorate_key(*_schema, key);
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return with_allocator(outer, [&dk, this] () -> partition_entry& {
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return with_linearized_managed_bytes([&] () -> partition_entry& {
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return find_or_create_partition(dk);
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});
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});
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});
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}
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partition_entry&
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memtable::find_or_create_partition(const dht::decorated_key& key) {
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assert(!reclaiming_enabled());
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// call lower_bound so we have a hint for the insert, just in case.
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auto i = partitions.lower_bound(key, memtable_entry::compare(_schema));
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if (i == partitions.end() || !key.equal(*_schema, i->key())) {
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memtable_entry* entry = current_allocator().construct<memtable_entry>(
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_schema, dht::decorated_key(key), mutation_partition(_schema));
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i = partitions.insert(i, *entry);
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return entry->partition();
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} else {
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upgrade_entry(*i);
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}
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return i->partition();
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}
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boost::iterator_range<memtable::partitions_type::const_iterator>
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memtable::slice(const query::partition_range& range) const {
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if (query::is_single_partition(range)) {
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const query::ring_position& pos = range.start()->value();
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auto i = partitions.find(pos, memtable_entry::compare(_schema));
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if (i != partitions.end()) {
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return boost::make_iterator_range(i, std::next(i));
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} else {
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return boost::make_iterator_range(i, i);
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}
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} else {
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auto cmp = memtable_entry::compare(_schema);
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auto i1 = range.start()
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? (range.start()->is_inclusive()
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? partitions.lower_bound(range.start()->value(), cmp)
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: partitions.upper_bound(range.start()->value(), cmp))
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: partitions.cbegin();
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auto i2 = range.end()
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? (range.end()->is_inclusive()
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? partitions.upper_bound(range.end()->value(), cmp)
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: partitions.lower_bound(range.end()->value(), cmp))
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: partitions.cend();
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return boost::make_iterator_range(i1, i2);
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}
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}
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class scanning_reader final : public mutation_reader::impl {
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lw_shared_ptr<memtable> _memtable;
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schema_ptr _schema;
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const query::partition_range& _range;
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stdx::optional<dht::decorated_key> _last;
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memtable::partitions_type::iterator _i;
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memtable::partitions_type::iterator _end;
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uint64_t _last_reclaim_counter;
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size_t _last_partition_count = 0;
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stdx::optional<query::partition_range> _delegate_range;
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mutation_reader _delegate;
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const io_priority_class& _pc;
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query::clustering_key_filtering_context _ck_filtering;
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private:
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memtable::partitions_type::iterator lookup_end() {
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auto cmp = memtable_entry::compare(_memtable->_schema);
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return _range.end()
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? (_range.end()->is_inclusive()
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? _memtable->partitions.upper_bound(_range.end()->value(), cmp)
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: _memtable->partitions.lower_bound(_range.end()->value(), cmp))
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: _memtable->partitions.end();
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}
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void update_iterators() {
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// We must be prepared that iterators may get invalidated during compaction.
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auto current_reclaim_counter = _memtable->reclaim_counter();
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auto cmp = memtable_entry::compare(_memtable->_schema);
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if (_last) {
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if (current_reclaim_counter != _last_reclaim_counter ||
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_last_partition_count != _memtable->partition_count()) {
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_i = _memtable->partitions.upper_bound(*_last, cmp);
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_end = lookup_end();
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_last_partition_count = _memtable->partition_count();
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}
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} else {
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// Initial lookup
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_i = _range.start()
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? (_range.start()->is_inclusive()
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? _memtable->partitions.lower_bound(_range.start()->value(), cmp)
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: _memtable->partitions.upper_bound(_range.start()->value(), cmp))
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: _memtable->partitions.begin();
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_end = lookup_end();
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_last_partition_count = _memtable->partition_count();
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}
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_last_reclaim_counter = current_reclaim_counter;
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}
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public:
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scanning_reader(schema_ptr s,
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lw_shared_ptr<memtable> m,
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const query::partition_range& range,
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const query::clustering_key_filtering_context& ck_filtering,
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const io_priority_class& pc)
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: _memtable(std::move(m))
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, _schema(std::move(s))
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, _range(range)
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, _pc(pc)
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, _ck_filtering(ck_filtering)
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{ }
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virtual future<streamed_mutation_opt> operator()() override {
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if (_delegate_range) {
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return _delegate();
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}
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// We cannot run concurrently with row_cache::update().
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if (_memtable->is_flushed()) {
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// FIXME: Use cache. See column_family::make_reader().
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_delegate_range = _last ? _range.split_after(*_last, dht::ring_position_comparator(*_memtable->_schema)) : _range;
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_delegate = make_mutation_reader<sstable_range_wrapping_reader>(
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_memtable->_sstable, _schema, *_delegate_range, _ck_filtering, _pc);
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_memtable = {};
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_last = {};
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return _delegate();
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}
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logalloc::reclaim_lock _(*_memtable);
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managed_bytes::linearization_context_guard lcg;
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update_iterators();
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if (_i == _end) {
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return make_ready_future<streamed_mutation_opt>(stdx::nullopt);
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}
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memtable_entry& e = *_i;
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++_i;
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_last = e.key();
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_memtable->upgrade_entry(e);
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return make_ready_future<streamed_mutation_opt>(e.read(_memtable, _schema, _ck_filtering));
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}
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};
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mutation_reader
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memtable::make_reader(schema_ptr s,
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const query::partition_range& range,
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const query::clustering_key_filtering_context& ck_filtering,
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const io_priority_class& pc) {
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if (query::is_wrap_around(range, *s)) {
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fail(unimplemented::cause::WRAP_AROUND);
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}
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if (query::is_single_partition(range)) {
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const query::ring_position& pos = range.start()->value();
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return _read_section(*this, [&] {
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managed_bytes::linearization_context_guard lcg;
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auto i = partitions.find(pos, memtable_entry::compare(_schema));
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if (i != partitions.end()) {
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upgrade_entry(*i);
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return make_reader_returning(i->read(shared_from_this(), s, ck_filtering));
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} else {
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return make_empty_reader();
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}
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});
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} else {
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return make_mutation_reader<scanning_reader>(std::move(s), shared_from_this(), range, ck_filtering, pc);
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}
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}
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void
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memtable::update(const db::replay_position& rp) {
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if (_replay_position < rp) {
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_replay_position = rp;
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}
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}
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future<>
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memtable::apply(memtable& mt) {
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return do_with(mt.make_reader(_schema), [this] (auto&& rd) mutable {
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return consume(rd, [self = this->shared_from_this(), &rd] (mutation&& m) {
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self->apply(m);
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return stop_iteration::no;
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});
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});
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}
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void
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memtable::apply(const mutation& m, const db::replay_position& rp) {
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with_allocator(allocator(), [this, &m] {
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_allocating_section(*this, [&, this] {
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with_linearized_managed_bytes([&] {
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auto& p = find_or_create_partition(m.decorated_key());
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p.apply(*_schema, m.partition(), *m.schema());
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});
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});
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});
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update(rp);
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}
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void
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memtable::apply(const frozen_mutation& m, const schema_ptr& m_schema, const db::replay_position& rp) {
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with_allocator(allocator(), [this, &m, &m_schema] {
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_allocating_section(*this, [&, this] {
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with_linearized_managed_bytes([&] {
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auto& p = find_or_create_partition_slow(m.key(*_schema));
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p.apply(*_schema, m.partition(), *m_schema);
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});
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});
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});
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update(rp);
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}
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logalloc::occupancy_stats memtable::occupancy() const {
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return logalloc::region::occupancy();
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}
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mutation_source memtable::as_data_source() {
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return mutation_source([mt = shared_from_this()] (schema_ptr s, const query::partition_range& range) {
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return mt->make_reader(std::move(s), range);
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});
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}
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key_source memtable::as_key_source() {
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return key_source([mt = shared_from_this()] (const query::partition_range& range) {
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return make_key_from_mutation_reader(mt->make_reader(mt->_schema, range));
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});
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}
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size_t memtable::partition_count() const {
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return partitions.size();
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}
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memtable_entry::memtable_entry(memtable_entry&& o) noexcept
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: _link()
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, _schema(std::move(o._schema))
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, _key(std::move(o._key))
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, _pe(std::move(o._pe))
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{
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using container_type = memtable::partitions_type;
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container_type::node_algorithms::replace_node(o._link.this_ptr(), _link.this_ptr());
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container_type::node_algorithms::init(o._link.this_ptr());
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}
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void memtable::mark_flushed(lw_shared_ptr<sstables::sstable> sst) {
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_sstable = std::move(sst);
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}
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bool memtable::is_flushed() const {
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return bool(_sstable);
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}
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streamed_mutation
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memtable_entry::read(lw_shared_ptr<memtable> mtbl, const schema_ptr& target_schema, const query::clustering_key_filtering_context& ck_filtering) {
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if (_schema->version() != target_schema->version()) {
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auto mp = mutation_partition(_pe.squashed(_schema, target_schema), *target_schema, ck_filtering.get_ranges(_key.key()));
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mutation m = mutation(target_schema, _key, std::move(mp));
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return streamed_mutation_from_mutation(std::move(m));
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}
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auto& cr = ck_filtering.get_ranges(_key.key());
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auto snp = _pe.read(_schema);
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return make_partition_snapshot_reader(_schema, _key, ck_filtering, cr, snp, *mtbl, mtbl->_read_section, mtbl);
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}
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void memtable::upgrade_entry(memtable_entry& e) {
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if (e._schema != _schema) {
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assert(!reclaiming_enabled());
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with_allocator(allocator(), [this, &e] {
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with_linearized_managed_bytes([&] {
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e.partition().upgrade(e._schema, _schema);
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e._schema = _schema;
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});
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});
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}
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}
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void memtable::set_schema(schema_ptr new_schema) noexcept {
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_schema = std::move(new_schema);
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}
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