381 lines
16 KiB
C++
381 lines
16 KiB
C++
/*
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* Modified by ScyllaDB
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* Copyright (C) 2015-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: (AGPL-3.0-or-later and Apache-2.0)
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*/
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#include <memory>
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#include <vector>
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#include <algorithm>
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#include <unordered_map>
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#include <boost/range/adaptor/map.hpp>
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#include <seastar/core/future.hh>
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#include <seastar/core/sharded.hh>
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#include "commitlog.hh"
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#include "commitlog_replayer.hh"
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#include "replica/database.hh"
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#include "sstables/sstables.hh"
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#include "db/system_keyspace.hh"
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#include "log.hh"
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#include "converting_mutation_partition_applier.hh"
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#include "schema/schema_registry.hh"
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#include "commitlog_entry.hh"
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#include "db/extensions.hh"
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#include "utils/fragmented_temporary_buffer.hh"
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#include "validation.hh"
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#include "mutation/mutation_partition_view.hh"
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static logging::logger rlogger("commitlog_replayer");
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class db::commitlog_replayer::impl {
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struct column_mappings {
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std::unordered_map<table_schema_version, column_mapping> map;
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future<> stop() { return make_ready_future<>(); }
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};
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// we want the processing methods to be const, since they use
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// shard-sharing of data -> read only
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// this one is special since it is thread local.
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// Should actually make sharded::local a const function (it does
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// not modify content), but...
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mutable seastar::sharded<column_mappings> _column_mappings;
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friend class db::commitlog_replayer;
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public:
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impl(seastar::sharded<replica::database>& db, seastar::sharded<db::system_keyspace>& sys_ks);
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future<> init();
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struct stats {
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uint64_t invalid_mutations = 0;
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uint64_t skipped_mutations = 0;
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uint64_t applied_mutations = 0;
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uint64_t corrupt_bytes = 0;
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stats& operator+=(const stats& s) {
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invalid_mutations += s.invalid_mutations;
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skipped_mutations += s.skipped_mutations;
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applied_mutations += s.applied_mutations;
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corrupt_bytes += s.corrupt_bytes;
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return *this;
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}
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stats operator+(const stats& s) const {
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stats tmp = *this;
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tmp += s;
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return tmp;
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}
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};
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// move start/stop of the thread local bookkeep to "top level"
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// and also make sure to assert on it actually being started.
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future<> start() {
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return _column_mappings.start();
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}
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future<> stop() {
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return _column_mappings.stop();
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}
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future<> process(stats*, commitlog::buffer_and_replay_position buf_rp) const;
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future<stats> recover(sstring file, const sstring& fname_prefix) const;
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typedef std::unordered_map<table_id, replay_position> rp_map;
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typedef std::unordered_map<unsigned, rp_map> shard_rpm_map;
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typedef std::unordered_map<unsigned, replay_position> shard_rp_map;
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replay_position min_pos(unsigned shard) const {
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auto i = _min_pos.find(shard);
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return i != _min_pos.end() ? i->second : replay_position();
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}
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replay_position cf_min_pos(const table_id& uuid, unsigned shard) const {
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auto i = _rpm.find(shard);
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if (i == _rpm.end()) {
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return replay_position();
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}
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auto j = i->second.find(uuid);
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return j != i->second.end() ? j->second : replay_position();
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}
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seastar::sharded<replica::database>& _db;
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seastar::sharded<db::system_keyspace>& _sys_ks;
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shard_rpm_map _rpm;
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shard_rp_map _min_pos;
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};
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db::commitlog_replayer::impl::impl(seastar::sharded<replica::database>& db, seastar::sharded<db::system_keyspace>& sys_ks)
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: _db(db)
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, _sys_ks(sys_ks)
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{}
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future<> db::commitlog_replayer::impl::init() {
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return _db.map_reduce([this](shard_rpm_map map) {
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for (auto& p1 : map) {
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for (auto& p2 : p1.second) {
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auto& pp = _rpm[p1.first][p2.first];
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pp = std::max(pp, p2.second);
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auto i = _min_pos.find(p1.first);
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if (i == _min_pos.end() || p2.second < i->second) {
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_min_pos[p1.first] = p2.second;
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}
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}
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}
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}, [this](replica::database& db) {
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return do_with(shard_rpm_map{}, [this, &db](shard_rpm_map& map) {
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return db.get_tables_metadata().parallel_for_each_table([this, &map] (table_id uuid, lw_shared_ptr<replica::table>) {
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// We do this on each cpu, for each CF, which technically is a little wasteful, but the values are
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// cached, this is only startup, and it makes the code easier.
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// Get all truncation records for the CF and initialize max rps if
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// present. Cannot do this on demand, as there may be no sstables to
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// mark the CF as "needed".
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return _sys_ks.local().get_truncated_positions(uuid).then([&map, uuid](std::vector<db::replay_position> tpps) {
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for (auto& p : tpps) {
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rlogger.trace("CF {} truncated at {}", uuid, p);
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auto& pp = map[p.shard_id()][uuid];
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pp = std::max(pp, p);
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}
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});
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}).then([&map] {
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return make_ready_future<shard_rpm_map>(map);
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});
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});
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}).finally([this] {
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// bugfix: the above map-reduce will not_ detect if sstables
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// are _missing_ from a CF. And because of re-sharding, we can't
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// just insert initial zeros into the maps, because we don't know
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// how many shards there was last time.
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// However, this only affects global min pos, since
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// for each CF, the worst that happens is that we have a missing
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// entry -> empty replay_pos == min value. But calculating
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// global min pos will be off, since we will only base it on
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// existing sstables-per-shard.
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// So, go through all CF:s and check, if a shard mapping does not
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// have data for it, assume we must set global pos to zero.
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_db.local().get_tables_metadata().for_each_table([&] (table_id id, lw_shared_ptr<replica::table>) {
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for (auto&p1 : _rpm) { // for each shard
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if (!p1.second.contains(id)) {
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_min_pos[p1.first] = replay_position();
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}
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}
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});
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for (auto&p : _min_pos) {
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rlogger.debug("minimum position for shard {}: {}", p.first, p.second);
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}
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for (auto&p1 : _rpm) {
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for (auto& p2 : p1.second) {
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rlogger.debug("replay position for shard/uuid {}/{}: {}", p1.first, p2.first, p2.second);
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}
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}
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});
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}
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future<db::commitlog_replayer::impl::stats>
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db::commitlog_replayer::impl::recover(sstring file, const sstring& fname_prefix) const {
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assert(_column_mappings.local_is_initialized());
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replay_position rp{commitlog::descriptor(file, fname_prefix)};
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auto gp = min_pos(rp.shard_id());
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if (rp.id < gp.id) {
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rlogger.debug("skipping replay of fully-flushed {}", file);
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return make_ready_future<stats>();
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}
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position_type p = 0;
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if (rp.id == gp.id) {
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p = gp.pos;
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}
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auto s = make_lw_shared<stats>();
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auto& exts = _db.local().extensions();
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return db::commitlog::read_log_file(file, fname_prefix,
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std::bind(&impl::process, this, s.get(), std::placeholders::_1),
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p, &exts).then_wrapped([s](future<> f) {
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try {
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f.get();
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} catch (commitlog::segment_data_corruption_error& e) {
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s->corrupt_bytes += e.bytes();
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} catch (...) {
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throw;
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}
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return make_ready_future<stats>(*s);
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});
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}
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future<> db::commitlog_replayer::impl::process(stats* s, commitlog::buffer_and_replay_position buf_rp) const {
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auto&& buf = buf_rp.buffer;
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auto&& rp = buf_rp.position;
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try {
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commitlog_entry_reader cer(buf);
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auto& fm = cer.mutation();
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auto& local_cm = _column_mappings.local().map;
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auto cm_it = local_cm.find(fm.schema_version());
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if (cm_it == local_cm.end()) {
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if (!cer.get_column_mapping()) {
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rlogger.debug("replaying at {} v={} at {}", fm.column_family_id(), fm.schema_version(), rp);
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throw std::runtime_error(format("unknown schema version {}, table=", fm.schema_version(), fm.column_family_id()));
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}
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rlogger.debug("new schema version {} in entry {}", fm.schema_version(), rp);
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cm_it = local_cm.emplace(fm.schema_version(), *cer.get_column_mapping()).first;
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}
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const column_mapping& src_cm = cm_it->second;
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auto shard_id = rp.shard_id();
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if (rp < min_pos(shard_id)) {
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rlogger.trace("entry {} is less than global min position. skipping", rp);
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s->skipped_mutations++;
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return make_ready_future<>();
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}
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auto uuid = fm.column_family_id();
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auto cf_rp = cf_min_pos(uuid, shard_id);
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if (rp <= cf_rp) {
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rlogger.trace("entry {} at {} is younger than recorded replay position {}. skipping", fm.column_family_id(), rp, cf_rp);
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s->skipped_mutations++;
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return make_ready_future<>();
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}
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auto& table = _db.local().find_column_family(uuid);
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const auto& schema = *table.schema();
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auto shard = table.get_effective_replication_map()->shard_of(schema, fm.token(schema));
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return _db.invoke_on(shard, [this, cer = std::move(cer), &src_cm, rp] (replica::database& db) mutable -> future<> {
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auto& fm = cer.mutation();
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// TODO: might need better verification that the deserialized mutation
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// is schema compatible. My guess is that just applying the mutation
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// will not do this.
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auto& cf = db.find_column_family(fm.column_family_id());
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if (rlogger.is_enabled(logging::log_level::debug)) {
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rlogger.debug("replaying at {} v={} {}:{} at {}", fm.column_family_id(), fm.schema_version(),
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cf.schema()->ks_name(), cf.schema()->cf_name(), rp);
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}
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if (const auto err = validation::is_cql_key_invalid(*cf.schema(), fm.key()); err) {
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throw std::runtime_error(fmt::format("found entry with invalid key {} at {} v={} {}:{} at {}: {}.", fm.key(), fm.column_family_id(),
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fm.schema_version(), cf.schema()->ks_name(), cf.schema()->cf_name(), rp, *err));
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}
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// Removed forwarding "new" RP. Instead give none/empty.
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// This is what origin does, and it should be fine.
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// The end result should be that once sstables are flushed out
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// their "replay_position" attribute will be empty, which is
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// lower than anything the new session will produce.
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if (cf.schema()->version() != fm.schema_version()) {
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auto& local_cm = _column_mappings.local().map;
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auto cm_it = local_cm.try_emplace(fm.schema_version(), src_cm).first;
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const column_mapping& cm = cm_it->second;
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mutation m(cf.schema(), fm.decorated_key(*cf.schema()));
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converting_mutation_partition_applier v(cm, *cf.schema(), m.partition());
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fm.partition().accept(cm, v);
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return do_with(std::move(m), [&db, &cf] (const mutation& m) {
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return db.apply_in_memory(m, cf, db::rp_handle(), db::no_timeout);
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});
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} else {
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return do_with(std::move(cer).mutation(), [&](const frozen_mutation& m) {
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return db.apply_in_memory(m, cf.schema(), db::rp_handle(), db::no_timeout);
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});
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}
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}).then_wrapped([s] (future<> f) {
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try {
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f.get();
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s->applied_mutations++;
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} catch (...) {
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s->invalid_mutations++;
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// TODO: write mutation to file like origin.
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rlogger.warn("error replaying: {}", std::current_exception());
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}
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});
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} catch (replica::no_such_column_family&) {
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// No such CF now? Origin just ignores this.
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} catch (...) {
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s->invalid_mutations++;
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// TODO: write mutation to file like origin.
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rlogger.warn("error replaying: {}", std::current_exception());
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}
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return make_ready_future<>();
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}
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db::commitlog_replayer::commitlog_replayer(seastar::sharded<replica::database>& db, seastar::sharded<db::system_keyspace>& sys_ks)
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: _impl(std::make_unique<impl>(db, sys_ks))
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{}
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db::commitlog_replayer::commitlog_replayer(commitlog_replayer&& r) noexcept
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: _impl(std::move(r._impl))
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{}
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db::commitlog_replayer::~commitlog_replayer()
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{}
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future<db::commitlog_replayer> db::commitlog_replayer::create_replayer(seastar::sharded<replica::database>& db, seastar::sharded<db::system_keyspace>& sys_ks) {
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return do_with(commitlog_replayer(db, sys_ks), [](auto&& rp) {
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auto f = rp._impl->init();
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return f.then([rp = std::move(rp)]() mutable {
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return make_ready_future<commitlog_replayer>(std::move(rp));
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});
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});
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}
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future<> db::commitlog_replayer::recover(std::vector<sstring> files, sstring fname_prefix) {
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typedef std::unordered_multimap<unsigned, sstring> shard_file_map;
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rlogger.info("Replaying {}", fmt::join(files, ", "));
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// pre-compute work per shard already.
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auto map = ::make_lw_shared<shard_file_map>();
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for (auto& f : files) {
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commitlog::descriptor d(f, fname_prefix);
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replay_position p = d;
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map->emplace(p.shard_id() % smp::count, std::move(f));
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}
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return do_with(std::move(fname_prefix), [this, map] (sstring& fname_prefix) {
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return _impl->start().then([this, map, &fname_prefix] {
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return map_reduce(smp::all_cpus(), [this, map, &fname_prefix] (unsigned id) {
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return smp::submit_to(id, [this, id, map, &fname_prefix] () {
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auto total = ::make_lw_shared<impl::stats>();
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// TODO: or something. For now, we do this serialized per shard,
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// to reduce mutation congestion. We could probably (says avi)
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// do 2 segments in parallel or something, but lets use this first.
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auto range = map->equal_range(id);
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return do_for_each(range.first, range.second, [this, total, &fname_prefix] (const std::pair<unsigned, sstring>& p) {
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auto&f = p.second;
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rlogger.debug("Replaying {}", f);
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return _impl->recover(f, fname_prefix).then([f, total](impl::stats stats) {
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if (stats.corrupt_bytes != 0) {
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rlogger.warn("Corrupted file: {}. {} bytes skipped.", f, stats.corrupt_bytes);
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}
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rlogger.debug("Log replay of {} complete, {} replayed mutations ({} invalid, {} skipped)"
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, f
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, stats.applied_mutations
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, stats.invalid_mutations
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, stats.skipped_mutations
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);
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*total += stats;
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});
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}).then([total] {
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return make_ready_future<impl::stats>(*total);
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});
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});
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}, impl::stats(), std::plus<impl::stats>()).then([](impl::stats totals) {
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rlogger.info("Log replay complete, {} replayed mutations ({} invalid, {} skipped)"
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, totals.applied_mutations
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, totals.invalid_mutations
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, totals.skipped_mutations
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);
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});
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}).finally([this] {
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return _impl->stop();
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});
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});
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}
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future<> db::commitlog_replayer::recover(sstring f, sstring fname_prefix) {
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return recover(std::vector<sstring>{ f }, std::move(fname_prefix));
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}
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