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scylladb/sstables_loader.cc
Pavel Emelyanov 11a04bfb66 code: Introduce restore API method 
The method starts a task that uses sstables_loader load-and-stream
functionality to bring new sstables into the cluster. The existing
load-and-stream picks up sstables from upload/ directory, the newly
introduced task collects them from S3 bucket and given prefix (that
correspond to the path where backup API method put them).

Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
2024-08-28 15:42:49 +03:00

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/*
* Copyright (C) 2021-present ScyllaDB
*/
/*
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
#include <fmt/ranges.h>
#include <seastar/core/coroutine.hh>
#include <seastar/coroutine/switch_to.hh>
#include <seastar/coroutine/parallel_for_each.hh>
#include <seastar/rpc/rpc.hh>
#include "sstables_loader.hh"
#include "replica/distributed_loader.hh"
#include "replica/database.hh"
#include "sstables/sstables_manager.hh"
#include "sstables/sstables.hh"
#include "gms/inet_address.hh"
#include "streaming/stream_mutation_fragments_cmd.hh"
#include "streaming/stream_reason.hh"
#include "readers/mutation_fragment_v1_stream.hh"
#include "locator/abstract_replication_strategy.hh"
#include "message/messaging_service.hh"
#include <cfloat>
#include <algorithm>
static logging::logger llog("sstables_loader");
namespace {
class send_meta_data {
gms::inet_address _node;
seastar::rpc::sink<frozen_mutation_fragment, streaming::stream_mutation_fragments_cmd> _sink;
seastar::rpc::source<int32_t> _source;
bool _error_from_peer = false;
size_t _num_partitions_sent = 0;
size_t _num_bytes_sent = 0;
future<> _receive_done;
private:
future<> do_receive() {
int32_t status = 0;
while (auto status_opt = co_await _source()) {
status = std::get<0>(*status_opt);
llog.debug("send_meta_data: got error code={}, from node={}", status, _node);
if (status == -1) {
_error_from_peer = true;
}
}
llog.debug("send_meta_data: finished reading source from node={}", _node);
if (_error_from_peer) {
throw std::runtime_error(format("send_meta_data: got error code={} from node={}", status, _node));
}
co_return;
}
public:
send_meta_data(gms::inet_address node,
seastar::rpc::sink<frozen_mutation_fragment, streaming::stream_mutation_fragments_cmd> sink,
seastar::rpc::source<int32_t> source)
: _node(std::move(node))
, _sink(std::move(sink))
, _source(std::move(source))
, _receive_done(make_ready_future<>()) {
}
void receive() {
_receive_done = do_receive();
}
future<> send(const frozen_mutation_fragment& fmf, bool is_partition_start) {
if (_error_from_peer) {
throw std::runtime_error(format("send_meta_data: got error from peer node={}", _node));
}
auto size = fmf.representation().size();
if (is_partition_start) {
++_num_partitions_sent;
}
_num_bytes_sent += size;
llog.trace("send_meta_data: send mf to node={}, size={}", _node, size);
co_return co_await _sink(fmf, streaming::stream_mutation_fragments_cmd::mutation_fragment_data);
}
future<> finish(bool failed) {
std::exception_ptr eptr;
try {
if (failed) {
co_await _sink(frozen_mutation_fragment(bytes_ostream()), streaming::stream_mutation_fragments_cmd::error);
} else {
co_await _sink(frozen_mutation_fragment(bytes_ostream()), streaming::stream_mutation_fragments_cmd::end_of_stream);
}
} catch (...) {
eptr = std::current_exception();
llog.warn("send_meta_data: failed to send {} to node={}, err={}",
failed ? "stream_mutation_fragments_cmd::error" : "stream_mutation_fragments_cmd::end_of_stream", _node, eptr);
}
try {
co_await _sink.close();
} catch (...) {
eptr = std::current_exception();
llog.warn("send_meta_data: failed to close sink to node={}, err={}", _node, eptr);
}
try {
co_await std::move(_receive_done);
} catch (...) {
eptr = std::current_exception();
llog.warn("send_meta_data: failed to process source from node={}, err={}", _node, eptr);
}
if (eptr) {
std::rethrow_exception(eptr);
}
co_return;
}
size_t num_partitions_sent() {
return _num_partitions_sent;
}
size_t num_bytes_sent() {
return _num_bytes_sent;
}
};
} // anonymous namespace
class sstable_streamer {
protected:
netw::messaging_service& _ms;
replica::database& _db;
replica::table& _table;
locator::effective_replication_map_ptr _erm;
std::vector<sstables::shared_sstable> _sstables;
public:
sstable_streamer(netw::messaging_service& ms, replica::database& db, ::table_id table_id, std::vector<sstables::shared_sstable> sstables)
: _ms(ms)
, _db(db)
, _table(db.find_column_family(table_id))
, _erm(_table.get_effective_replication_map())
, _sstables(std::move(sstables)) {
// By sorting SSTables by their primary key, we allow SSTable runs to be
// incrementally streamed.
// Overlapping run fragments can have their content deduplicated, reducing
// the amount of data we need to put on the wire.
// Elements are popped off from the back of the vector, therefore we're sorting
// it in descending order, to start from the smaller tokens.
std::ranges::sort(_sstables, [] (const sstables::shared_sstable& x, const sstables::shared_sstable& y) {
return x->compare_by_first_key(*y) > 0;
});
}
virtual ~sstable_streamer() {}
virtual future<> stream(bool primary_replica_only);
inet_address_vector_replica_set get_endpoints(const dht::token& token, bool primary_replica_only) const;
protected:
virtual inet_address_vector_replica_set get_primary_endpoints(const dht::token& token) const;
future<> stream_sstables(const dht::partition_range&, std::vector<sstables::shared_sstable>, bool primary_replica_only);
future<> stream_sstable_mutations(const dht::partition_range&, std::vector<sstables::shared_sstable>, bool primary_replica_only);
};
class tablet_sstable_streamer : public sstable_streamer {
const locator::tablet_map& _tablet_map;
public:
tablet_sstable_streamer(netw::messaging_service& ms, replica::database& db, ::table_id table_id, std::vector<sstables::shared_sstable> sstables)
: sstable_streamer(ms, db, table_id, std::move(sstables))
, _tablet_map(_erm->get_token_metadata().tablets().get_tablet_map(table_id)) {
}
inet_address_vector_replica_set to_replica_set(const locator::tablet_replica_set& replicas) const {
auto& tm = _erm->get_token_metadata();
inet_address_vector_replica_set result;
result.reserve(replicas.size());
for (auto&& replica : replicas) {
result.push_back(tm.get_endpoint_for_host_id(replica.host));
}
return result;
}
virtual future<> stream(bool primary_replica_only) override;
virtual inet_address_vector_replica_set get_primary_endpoints(const dht::token& token) const override;
private:
future<> stream_fully_contained_sstables(const dht::partition_range& pr, std::vector<sstables::shared_sstable> sstables,
bool primary_replica_only) {
// FIXME: fully contained sstables can be optimized.
return stream_sstables(pr, std::move(sstables), primary_replica_only);
}
};
inet_address_vector_replica_set sstable_streamer::get_endpoints(const dht::token& token, bool primary_replica_only) const {
if (primary_replica_only) {
return get_primary_endpoints(token);
}
auto current_targets = _erm->get_natural_endpoints_without_node_being_replaced(token);
auto pending = _erm->get_pending_endpoints(token);
std::move(pending.begin(), pending.end(), std::back_inserter(current_targets));
return current_targets;
}
inet_address_vector_replica_set sstable_streamer::get_primary_endpoints(const dht::token& token) const {
auto current_targets = _erm->get_natural_endpoints(token);
current_targets.resize(1);
return current_targets;
}
inet_address_vector_replica_set tablet_sstable_streamer::get_primary_endpoints(const dht::token& token) const {
auto tid = _tablet_map.get_tablet_id(token);
auto replicas = locator::get_primary_replicas(_tablet_map.get_tablet_info(tid), _tablet_map.get_tablet_transition_info(tid));
return to_replica_set(replicas);
}
future<> sstable_streamer::stream(bool primary_replica_only) {
const auto full_partition_range = dht::partition_range::make_open_ended_both_sides();
co_await stream_sstables(full_partition_range, std::move(_sstables), primary_replica_only);
}
future<> tablet_sstable_streamer::stream(bool primary_replica_only) {
// sstables are sorted by first key in reverse order.
auto sstable_it = _sstables.rbegin();
for (auto tablet_id : _tablet_map.tablet_ids()) {
auto tablet_range = _tablet_map.get_token_range(tablet_id);
auto sstable_token_range = [] (const sstables::shared_sstable& sst) {
return dht::token_range(sst->get_first_decorated_key().token(),
sst->get_last_decorated_key().token());
};
std::vector<sstables::shared_sstable> sstables_fully_contained;
std::vector<sstables::shared_sstable> sstables_partially_contained;
// sstable is exhausted if its last key is before the current tablet range
auto exhausted = [&tablet_range] (const sstables::shared_sstable& sst) {
return tablet_range.before(sst->get_last_decorated_key().token(), dht::token_comparator{});
};
while (sstable_it != _sstables.rend() && exhausted(*sstable_it)) {
sstable_it++;
}
for (auto sst_it = sstable_it; sst_it != _sstables.rend(); sst_it++) {
auto sst_token_range = sstable_token_range(*sst_it);
// sstables are sorted by first key, so we're done with current tablet when
// the next sstable doesn't overlap with its owned token range.
if (!tablet_range.overlaps(sst_token_range, dht::token_comparator{})) {
break;
}
if (tablet_range.contains(sst_token_range, dht::token_comparator{})) {
sstables_fully_contained.push_back(*sst_it);
} else {
sstables_partially_contained.push_back(*sst_it);
}
co_await coroutine::maybe_yield();
}
auto tablet_pr = dht::to_partition_range(tablet_range);
co_await stream_sstables(tablet_pr, std::move(sstables_partially_contained), primary_replica_only);
co_await stream_fully_contained_sstables(tablet_pr, std::move(sstables_fully_contained), primary_replica_only);
}
}
future<> sstable_streamer::stream_sstables(const dht::partition_range& pr, std::vector<sstables::shared_sstable> sstables,
bool primary_replica_only) {
while (!sstables.empty()) {
size_t batch_sst_nr = 16;
std::vector<sstables::shared_sstable> sst_processed;
sst_processed.reserve(std::min(sstables.size(), size_t(16)));
while (batch_sst_nr-- && !sstables.empty()) {
auto sst = sstables.back();
sst_processed.push_back(sst);
sstables.pop_back();
}
co_await stream_sstable_mutations(pr, std::move(sst_processed), primary_replica_only);
}
}
future<> sstable_streamer::stream_sstable_mutations(const dht::partition_range& pr, std::vector<sstables::shared_sstable> sstables,
bool primary_replica_only) {
const auto token_range = pr.transform(std::mem_fn(&dht::ring_position::token));
auto s = _table.schema();
const auto cf_id = s->id();
const auto reason = streaming::stream_reason::repair;
size_t nr_sst_total = _sstables.size();
size_t nr_sst_current = 0;
// FIXME: indentation
auto ops_uuid = streaming::plan_id{utils::make_random_uuid()};
auto sst_set = make_lw_shared<sstables::sstable_set>(sstables::make_partitioned_sstable_set(s, false));
size_t estimated_partitions = 0;
for (auto& sst : sstables) {
estimated_partitions += sst->estimated_keys_for_range(token_range);
sst_set->insert(sst);
}
llog.info("load_and_stream: started ops_uuid={}, process [{}-{}] out of {} sstables=[{}]",
ops_uuid, nr_sst_current, nr_sst_current + sstables.size(), nr_sst_total,
fmt::join(sstables | boost::adaptors::transformed([] (auto sst) { return sst->get_filename(); }), ", "));
auto start_time = std::chrono::steady_clock::now();
inet_address_vector_replica_set current_targets;
std::unordered_map<gms::inet_address, send_meta_data> metas;
size_t num_partitions_processed = 0;
size_t num_bytes_read = 0;
nr_sst_current += sstables.size();
auto permit = co_await _db.obtain_reader_permit(_table, "sstables_loader::load_and_stream()", db::no_timeout, {});
auto reader = mutation_fragment_v1_stream(_table.make_streaming_reader(s, std::move(permit), pr, sst_set, gc_clock::now()));
std::exception_ptr eptr;
bool failed = false;
try {
while (auto mf = co_await reader()) {
bool is_partition_start = mf->is_partition_start();
if (is_partition_start) {
++num_partitions_processed;
auto& start = mf->as_partition_start();
const auto& current_dk = start.key();
current_targets = get_endpoints(current_dk.token(), primary_replica_only);
llog.trace("load_and_stream: ops_uuid={}, current_dk={}, current_targets={}", ops_uuid,
current_dk.token(), current_targets);
for (auto& node : current_targets) {
if (!metas.contains(node)) {
auto [sink, source] = co_await _ms.make_sink_and_source_for_stream_mutation_fragments(reader.schema()->version(),
ops_uuid, cf_id, estimated_partitions, reason, service::default_session_id, netw::messaging_service::msg_addr(node));
llog.debug("load_and_stream: ops_uuid={}, make sink and source for node={}", ops_uuid, node);
metas.emplace(node, send_meta_data(node, std::move(sink), std::move(source)));
metas.at(node).receive();
}
}
}
frozen_mutation_fragment fmf = freeze(*s, *mf);
num_bytes_read += fmf.representation().size();
co_await coroutine::parallel_for_each(current_targets, [&metas, &fmf, is_partition_start] (const gms::inet_address& node) {
return metas.at(node).send(fmf, is_partition_start);
});
}
} catch (...) {
failed = true;
eptr = std::current_exception();
llog.warn("load_and_stream: ops_uuid={}, ks={}, table={}, send_phase, err={}",
ops_uuid, s->ks_name(), s->cf_name(), eptr);
}
co_await reader.close();
try {
co_await coroutine::parallel_for_each(metas.begin(), metas.end(), [failed] (std::pair<const gms::inet_address, send_meta_data>& pair) {
auto& meta = pair.second;
return meta.finish(failed);
});
} catch (...) {
failed = true;
eptr = std::current_exception();
llog.warn("load_and_stream: ops_uuid={}, ks={}, table={}, finish_phase, err={}",
ops_uuid, s->ks_name(), s->cf_name(), eptr);
}
if (!failed) {
try {
co_await coroutine::parallel_for_each(sstables, [&] (sstables::shared_sstable& sst) {
llog.debug("load_and_stream: ops_uuid={}, ks={}, table={}, remove sst={}",
ops_uuid, s->ks_name(), s->cf_name(), sst->component_filenames());
return sst->unlink();
});
} catch (...) {
failed = true;
eptr = std::current_exception();
llog.warn("load_and_stream: ops_uuid={}, ks={}, table={}, del_sst_phase, err={}",
ops_uuid, s->ks_name(), s->cf_name(), eptr);
}
}
auto duration = std::chrono::duration_cast<std::chrono::duration<float>>(std::chrono::steady_clock::now() - start_time).count();
for (auto& [node, meta] : metas) {
llog.info("load_and_stream: ops_uuid={}, ks={}, table={}, target_node={}, num_partitions_sent={}, num_bytes_sent={}",
ops_uuid, s->ks_name(), s->cf_name(), node, meta.num_partitions_sent(), meta.num_bytes_sent());
}
auto partition_rate = std::fabs(duration) > FLT_EPSILON ? num_partitions_processed / duration : 0;
auto bytes_rate = std::fabs(duration) > FLT_EPSILON ? num_bytes_read / duration / 1024 / 1024 : 0;
auto status = failed ? "failed" : "succeeded";
llog.info("load_and_stream: finished ops_uuid={}, ks={}, table={}, partitions_processed={} partitions, bytes_processed={} bytes, partitions_per_second={} partitions/s, bytes_per_second={} MiB/s, duration={} s, status={}",
ops_uuid, s->ks_name(), s->cf_name(), num_partitions_processed, num_bytes_read, partition_rate, bytes_rate, duration, status);
if (failed) {
std::rethrow_exception(eptr);
}
co_return;
}
template <typename... Args>
static std::unique_ptr<sstable_streamer> make_sstable_streamer(bool uses_tablets, Args&&... args) {
if (uses_tablets) {
return std::make_unique<tablet_sstable_streamer>(std::forward<Args>(args)...);
}
return std::make_unique<sstable_streamer>(std::forward<Args>(args)...);
}
future<> sstables_loader::load_and_stream(sstring ks_name, sstring cf_name,
::table_id table_id, std::vector<sstables::shared_sstable> sstables, bool primary_replica_only) {
// streamer guarantees topology stability, for correctness, by holding effective_replication_map
// throughout its lifetime.
auto streamer = make_sstable_streamer(_db.local().find_column_family(table_id).uses_tablets(),
_messaging, _db.local(), table_id, std::move(sstables));
co_await streamer->stream(primary_replica_only);
}
// For more details, see distributed_loader::process_upload_dir().
// All the global operations are going to happen here, and just the reloading happens
// in there.
future<> sstables_loader::load_new_sstables(sstring ks_name, sstring cf_name,
bool load_and_stream, bool primary_replica_only) {
if (_loading_new_sstables) {
throw std::runtime_error("Already loading SSTables. Try again later");
} else {
_loading_new_sstables = true;
}
co_await coroutine::switch_to(_sched_group);
sstring load_and_stream_desc = fmt::format("{}", load_and_stream);
const auto& rs = _db.local().find_keyspace(ks_name).get_replication_strategy();
if (rs.is_per_table() && !load_and_stream) {
load_and_stream = true;
load_and_stream_desc = "auto-enabled-for-tablets";
}
llog.info("Loading new SSTables for keyspace={}, table={}, load_and_stream={}, primary_replica_only={}",
ks_name, cf_name, load_and_stream_desc, primary_replica_only);
try {
if (load_and_stream) {
::table_id table_id;
std::vector<std::vector<sstables::shared_sstable>> sstables_on_shards;
// Load-and-stream reads the entire content from SSTables, therefore it can afford to discard the bloom filter
// that might otherwise consume a significant amount of memory.
sstables::sstable_open_config cfg {
.load_bloom_filter = false,
};
std::tie(table_id, sstables_on_shards) = co_await replica::distributed_loader::get_sstables_from_upload_dir(_db, ks_name, cf_name, cfg);
co_await container().invoke_on_all([&sstables_on_shards, ks_name, cf_name, table_id, primary_replica_only] (sstables_loader& loader) mutable -> future<> {
co_await loader.load_and_stream(ks_name, cf_name, table_id, std::move(sstables_on_shards[this_shard_id()]), primary_replica_only);
});
} else {
co_await replica::distributed_loader::process_upload_dir(_db, _view_builder, ks_name, cf_name);
}
} catch (...) {
llog.warn("Done loading new SSTables for keyspace={}, table={}, load_and_stream={}, primary_replica_only={}, status=failed: {}",
ks_name, cf_name, load_and_stream, primary_replica_only, std::current_exception());
_loading_new_sstables = false;
throw;
}
llog.info("Done loading new SSTables for keyspace={}, table={}, load_and_stream={}, primary_replica_only={}, status=succeeded",
ks_name, cf_name, load_and_stream, primary_replica_only);
_loading_new_sstables = false;
co_return;
}
class sstables_loader::download_task_impl : public tasks::task_manager::task::impl {
sharded<sstables_loader>& _loader;
sstring _endpoint;
sstring _bucket;
sstring _ks;
sstring _cf;
sstring _snapshot_name;
protected:
virtual future<> run() override;
public:
download_task_impl(tasks::task_manager::module_ptr module, sharded<sstables_loader>& loader,
sstring endpoint, sstring bucket,
sstring ks, sstring cf, sstring snapshot) noexcept
: tasks::task_manager::task::impl(module, tasks::task_id::create_random_id(), 0, "node", ks, "", "", tasks::task_id::create_null_id())
, _loader(loader)
, _endpoint(std::move(endpoint))
, _bucket(std::move(bucket))
, _ks(std::move(ks))
, _cf(std::move(cf))
, _snapshot_name(std::move(snapshot))
{}
virtual std::string type() const override {
return "download_sstables";
}
virtual tasks::is_internal is_internal() const noexcept override {
return tasks::is_internal::no;
}
};
future<> sstables_loader::download_task_impl::run() {
// Load-and-stream reads the entire content from SSTables, therefore it can afford to discard the bloom filter
// that might otherwise consume a significant amount of memory.
sstables::sstable_open_config cfg {
.load_bloom_filter = false,
};
auto prefix = format("{}/{}", _cf, _snapshot_name);
llog.debug("Loading sstables from {}({}/{})", _endpoint, _bucket, prefix);
auto [ table_id, sstables_on_shards ] = co_await replica::distributed_loader::get_sstables_from_object_store(_loader.local()._db, _ks, _cf, _endpoint, _bucket, prefix, cfg);
llog.debug("Streaming sstables from {}({}/{})", _endpoint, _bucket, prefix);
co_await _loader.invoke_on_all([this, &sstables_on_shards, table_id] (sstables_loader& loader) mutable -> future<> {
co_await loader.load_and_stream(_ks, _cf, table_id, std::move(sstables_on_shards[this_shard_id()]), false);
});
}
sstables_loader::sstables_loader(sharded<replica::database>& db,
netw::messaging_service& messaging,
sharded<db::view::view_builder>& vb,
tasks::task_manager& tm,
sstables::storage_manager& sstm,
seastar::scheduling_group sg)
: _db(db)
, _messaging(messaging)
, _view_builder(vb)
, _task_manager_module(make_shared<task_manager_module>(tm))
, _storage_manager(sstm)
, _sched_group(std::move(sg))
{
tm.register_module("sstables_loader", _task_manager_module);
}
future<> sstables_loader::stop() {
co_await _task_manager_module->stop();
}
future<tasks::task_id> sstables_loader::download_new_sstables(sstring ks_name, sstring cf_name,
sstring endpoint, sstring bucket, sstring snapshot) {
if (!_storage_manager.is_known_endpoint(endpoint)) {
throw std::invalid_argument(format("endpoint {} not found", endpoint));
}
llog.info("Restore sstables from {}({}) to {}", endpoint, snapshot, ks_name);
auto task = co_await _task_manager_module->make_and_start_task<download_task_impl>({}, container(), std::move(endpoint), std::move(bucket), std::move(ks_name), std::move(cf_name), std::move(snapshot));
co_return task->id();
}
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