Attempt to recover from db with missing table files (#6334)
Summary: There are situations when RocksDB tries to recover, but the db is in an inconsistent state due to SST files referenced in the MANIFEST being missing. In this case, previous RocksDB will just fail the recovery and return a non-ok status. This PR enables another possibility. During recovery, RocksDB checks possible MANIFEST files, and try to recover to the most recent state without missing table file. `VersionSet::Recover()` applies version edits incrementally and "materializes" a version only when this version does not reference any missing table file. After processing the entire MANIFEST, the version created last will be the latest version. `DBImpl::Recover()` calls `VersionSet::Recover()`. Afterwards, WAL replay will *not* be performed. To use this capability, set `options.best_efforts_recovery = true` when opening the db. Best-efforts recovery is currently incompatible with atomic flush. Test plan (on devserver): ``` $make check $COMPILE_WITH_ASAN=1 make all && make check ``` Pull Request resolved: https://github.com/facebook/rocksdb/pull/6334 Reviewed By: anand1976 Differential Revision: D19778960 Pulled By: riversand963 fbshipit-source-id: c27ea80f29bc952e7d3311ecf5ee9c54393b40a8main
Yanqin Jin
5 years ago
committed by
Facebook GitHub Bot
parent
4fc216649d
commit
fb09ef05dc
@ -0,0 +1,576 @@ |
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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "db/version_edit_handler.h" |
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#include "monitoring/persistent_stats_history.h" |
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namespace ROCKSDB_NAMESPACE { |
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VersionEditHandler::VersionEditHandler( |
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bool read_only, const std::vector<ColumnFamilyDescriptor>& column_families, |
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VersionSet* version_set, bool track_missing_files, |
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bool no_error_if_table_files_missing) |
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: read_only_(read_only), |
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column_families_(column_families), |
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status_(), |
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version_set_(version_set), |
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track_missing_files_(track_missing_files), |
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no_error_if_table_files_missing_(no_error_if_table_files_missing), |
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initialized_(false) { |
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assert(version_set_ != nullptr); |
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} |
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Status VersionEditHandler::Iterate(log::Reader& reader, std::string* db_id) { |
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Slice record; |
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std::string scratch; |
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size_t recovered_edits = 0; |
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Status s = Initialize(); |
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while (reader.ReadRecord(&record, &scratch) && s.ok()) { |
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VersionEdit edit; |
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s = edit.DecodeFrom(record); |
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if (!s.ok()) { |
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break; |
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} |
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if (edit.has_db_id_) { |
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version_set_->db_id_ = edit.GetDbId(); |
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if (db_id != nullptr) { |
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*db_id = version_set_->db_id_; |
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} |
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} |
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s = read_buffer_.AddEdit(&edit); |
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if (!s.ok()) { |
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break; |
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} |
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ColumnFamilyData* cfd = nullptr; |
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if (edit.is_in_atomic_group_) { |
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if (read_buffer_.IsFull()) { |
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for (auto& e : read_buffer_.replay_buffer()) { |
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s = ApplyVersionEdit(e, &cfd); |
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if (!s.ok()) { |
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break; |
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} |
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++recovered_edits; |
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} |
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if (!s.ok()) { |
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break; |
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} |
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read_buffer_.Clear(); |
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} |
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} else { |
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s = ApplyVersionEdit(edit, &cfd); |
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if (s.ok()) { |
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++recovered_edits; |
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} |
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} |
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} |
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CheckIterationResult(reader, &s); |
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if (!s.ok()) { |
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status_ = s; |
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} |
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return s; |
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} |
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Status VersionEditHandler::Initialize() { |
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Status s; |
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if (!initialized_) { |
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for (const auto& cf_desc : column_families_) { |
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name_to_options_.emplace(cf_desc.name, cf_desc.options); |
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} |
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auto default_cf_iter = name_to_options_.find(kDefaultColumnFamilyName); |
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if (default_cf_iter == name_to_options_.end()) { |
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s = Status::InvalidArgument("Default column family not specified"); |
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} |
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if (s.ok()) { |
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VersionEdit default_cf_edit; |
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default_cf_edit.AddColumnFamily(kDefaultColumnFamilyName); |
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default_cf_edit.SetColumnFamily(0); |
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ColumnFamilyData* cfd = |
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CreateCfAndInit(default_cf_iter->second, default_cf_edit); |
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assert(cfd != nullptr); |
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#ifdef NDEBUG |
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(void)cfd; |
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#endif |
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initialized_ = true; |
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} |
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} |
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return s; |
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} |
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Status VersionEditHandler::ApplyVersionEdit(VersionEdit& edit, |
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ColumnFamilyData** cfd) { |
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Status s; |
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if (edit.is_column_family_add_) { |
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s = OnColumnFamilyAdd(edit, cfd); |
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} else if (edit.is_column_family_drop_) { |
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s = OnColumnFamilyDrop(edit, cfd); |
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} else { |
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s = OnNonCfOperation(edit, cfd); |
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} |
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if (s.ok()) { |
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assert(cfd != nullptr); |
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s = ExtractInfoFromVersionEdit(*cfd, edit); |
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} |
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return s; |
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} |
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Status VersionEditHandler::OnColumnFamilyAdd(VersionEdit& edit, |
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ColumnFamilyData** cfd) { |
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bool cf_in_not_found = false; |
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bool cf_in_builders = false; |
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CheckColumnFamilyId(edit, &cf_in_not_found, &cf_in_builders); |
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assert(cfd != nullptr); |
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*cfd = nullptr; |
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Status s; |
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if (cf_in_builders || cf_in_not_found) { |
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s = Status::Corruption("MANIFEST adding the same column family twice: " + |
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edit.column_family_name_); |
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} |
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if (s.ok()) { |
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auto cf_options = name_to_options_.find(edit.column_family_name_); |
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// implicitly add persistent_stats column family without requiring user
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// to specify
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ColumnFamilyData* tmp_cfd = nullptr; |
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bool is_persistent_stats_column_family = |
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edit.column_family_name_.compare(kPersistentStatsColumnFamilyName) == 0; |
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if (cf_options == name_to_options_.end() && |
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!is_persistent_stats_column_family) { |
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column_families_not_found_.emplace(edit.column_family_, |
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edit.column_family_name_); |
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} else { |
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if (is_persistent_stats_column_family) { |
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ColumnFamilyOptions cfo; |
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OptimizeForPersistentStats(&cfo); |
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tmp_cfd = CreateCfAndInit(cfo, edit); |
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} else { |
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tmp_cfd = CreateCfAndInit(cf_options->second, edit); |
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} |
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*cfd = tmp_cfd; |
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} |
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} |
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return s; |
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} |
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Status VersionEditHandler::OnColumnFamilyDrop(VersionEdit& edit, |
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ColumnFamilyData** cfd) { |
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bool cf_in_not_found = false; |
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bool cf_in_builders = false; |
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CheckColumnFamilyId(edit, &cf_in_not_found, &cf_in_builders); |
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assert(cfd != nullptr); |
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*cfd = nullptr; |
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ColumnFamilyData* tmp_cfd = nullptr; |
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Status s; |
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if (cf_in_builders) { |
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tmp_cfd = DestroyCfAndCleanup(edit); |
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} else if (cf_in_not_found) { |
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column_families_not_found_.erase(edit.column_family_); |
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} else { |
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s = Status::Corruption("MANIFEST - dropping non-existing column family"); |
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} |
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*cfd = tmp_cfd; |
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return s; |
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} |
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Status VersionEditHandler::OnNonCfOperation(VersionEdit& edit, |
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ColumnFamilyData** cfd) { |
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bool cf_in_not_found = false; |
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bool cf_in_builders = false; |
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CheckColumnFamilyId(edit, &cf_in_not_found, &cf_in_builders); |
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assert(cfd != nullptr); |
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*cfd = nullptr; |
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Status s; |
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if (!cf_in_not_found) { |
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if (!cf_in_builders) { |
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s = Status::Corruption( |
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"MANIFEST record referencing unknown column family"); |
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} |
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ColumnFamilyData* tmp_cfd = nullptr; |
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if (s.ok()) { |
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auto builder_iter = builders_.find(edit.column_family_); |
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assert(builder_iter != builders_.end()); |
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tmp_cfd = version_set_->GetColumnFamilySet()->GetColumnFamily( |
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edit.column_family_); |
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assert(tmp_cfd != nullptr); |
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s = MaybeCreateVersion(edit, tmp_cfd, /*force_create_version=*/false); |
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if (s.ok()) { |
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s = builder_iter->second->version_builder()->Apply(&edit); |
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} |
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} |
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*cfd = tmp_cfd; |
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} |
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return s; |
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} |
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// TODO maybe cache the computation result
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bool VersionEditHandler::HasMissingFiles() const { |
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bool ret = false; |
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for (const auto& elem : cf_to_missing_files_) { |
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const auto& missing_files = elem.second; |
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if (!missing_files.empty()) { |
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ret = true; |
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break; |
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} |
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} |
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return ret; |
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} |
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void VersionEditHandler::CheckColumnFamilyId(const VersionEdit& edit, |
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bool* cf_in_not_found, |
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bool* cf_in_builders) const { |
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assert(cf_in_not_found != nullptr); |
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assert(cf_in_builders != nullptr); |
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// Not found means that user didn't supply that column
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// family option AND we encountered column family add
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// record. Once we encounter column family drop record,
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// we will delete the column family from
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// column_families_not_found.
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bool in_not_found = column_families_not_found_.find(edit.column_family_) != |
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column_families_not_found_.end(); |
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// in builders means that user supplied that column family
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// option AND that we encountered column family add record
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bool in_builders = builders_.find(edit.column_family_) != builders_.end(); |
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// They cannot both be true
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assert(!(in_not_found && in_builders)); |
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*cf_in_not_found = in_not_found; |
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*cf_in_builders = in_builders; |
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} |
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void VersionEditHandler::CheckIterationResult(const log::Reader& reader, |
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Status* s) { |
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assert(s != nullptr); |
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if (!s->ok()) { |
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read_buffer_.Clear(); |
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} else if (!version_edit_params_.has_log_number_ || |
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!version_edit_params_.has_next_file_number_ || |
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!version_edit_params_.has_last_sequence_) { |
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std::string msg("no "); |
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if (!version_edit_params_.has_log_number_) { |
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msg.append("log_file_number, "); |
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} |
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if (!version_edit_params_.has_next_file_number_) { |
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msg.append("next_file_number, "); |
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} |
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if (!version_edit_params_.has_last_sequence_) { |
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msg.append("last_sequence, "); |
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} |
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msg = msg.substr(0, msg.size() - 2); |
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msg.append(" entry in MANIFEST"); |
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*s = Status::Corruption(msg); |
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} |
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if (s->ok() && !read_only_ && !column_families_not_found_.empty()) { |
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std::string msg; |
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for (const auto& cf : column_families_not_found_) { |
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msg.append(", "); |
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msg.append(cf.second); |
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} |
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msg = msg.substr(2); |
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*s = Status::InvalidArgument("Column families not opened: " + msg); |
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} |
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if (s->ok()) { |
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version_set_->GetColumnFamilySet()->UpdateMaxColumnFamily( |
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version_edit_params_.max_column_family_); |
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version_set_->MarkMinLogNumberToKeep2PC( |
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version_edit_params_.min_log_number_to_keep_); |
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version_set_->MarkFileNumberUsed(version_edit_params_.prev_log_number_); |
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version_set_->MarkFileNumberUsed(version_edit_params_.log_number_); |
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for (auto* cfd : *(version_set_->GetColumnFamilySet())) { |
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auto builder_iter = builders_.find(cfd->GetID()); |
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assert(builder_iter != builders_.end()); |
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auto* builder = builder_iter->second->version_builder(); |
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if (!builder->CheckConsistencyForNumLevels()) { |
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*s = Status::InvalidArgument( |
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"db has more levels than options.num_levels"); |
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break; |
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} |
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} |
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} |
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if (s->ok()) { |
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for (auto* cfd : *(version_set_->GetColumnFamilySet())) { |
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if (cfd->IsDropped()) { |
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continue; |
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} |
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if (read_only_) { |
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cfd->table_cache()->SetTablesAreImmortal(); |
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} |
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*s = LoadTables(cfd, /*prefetch_index_and_filter_in_cache=*/false, |
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/*is_initial_load=*/true); |
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if (!s->ok()) { |
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break; |
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} |
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} |
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} |
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if (s->ok()) { |
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for (auto* cfd : *(version_set_->column_family_set_)) { |
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if (cfd->IsDropped()) { |
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continue; |
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} |
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assert(cfd->initialized()); |
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VersionEdit edit; |
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*s = MaybeCreateVersion(edit, cfd, /*force_create_version=*/true); |
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if (!s->ok()) { |
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break; |
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} |
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} |
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} |
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if (s->ok()) { |
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version_set_->manifest_file_size_ = reader.GetReadOffset(); |
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assert(version_set_->manifest_file_size_ > 0); |
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version_set_->next_file_number_.store( |
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version_edit_params_.next_file_number_ + 1); |
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version_set_->last_allocated_sequence_ = |
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version_edit_params_.last_sequence_; |
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version_set_->last_published_sequence_ = |
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version_edit_params_.last_sequence_; |
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version_set_->last_sequence_ = version_edit_params_.last_sequence_; |
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version_set_->prev_log_number_ = version_edit_params_.prev_log_number_; |
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} |
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} |
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ColumnFamilyData* VersionEditHandler::CreateCfAndInit( |
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const ColumnFamilyOptions& cf_options, const VersionEdit& edit) { |
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ColumnFamilyData* cfd = version_set_->CreateColumnFamily(cf_options, &edit); |
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assert(cfd != nullptr); |
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cfd->set_initialized(); |
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assert(builders_.find(edit.column_family_) == builders_.end()); |
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builders_.emplace(edit.column_family_, |
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VersionBuilderUPtr(new BaseReferencedVersionBuilder(cfd))); |
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if (track_missing_files_) { |
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cf_to_missing_files_.emplace(edit.column_family_, |
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std::unordered_set<uint64_t>()); |
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} |
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return cfd; |
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} |
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ColumnFamilyData* VersionEditHandler::DestroyCfAndCleanup( |
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const VersionEdit& edit) { |
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auto builder_iter = builders_.find(edit.column_family_); |
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assert(builder_iter != builders_.end()); |
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builders_.erase(builder_iter); |
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if (track_missing_files_) { |
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auto missing_files_iter = cf_to_missing_files_.find(edit.column_family_); |
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assert(missing_files_iter != cf_to_missing_files_.end()); |
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cf_to_missing_files_.erase(missing_files_iter); |
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} |
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ColumnFamilyData* ret = |
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version_set_->GetColumnFamilySet()->GetColumnFamily(edit.column_family_); |
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assert(ret != nullptr); |
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if (ret->UnrefAndTryDelete()) { |
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ret = nullptr; |
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} else { |
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assert(false); |
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} |
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return ret; |
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} |
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Status VersionEditHandler::MaybeCreateVersion(const VersionEdit& /*edit*/, |
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ColumnFamilyData* cfd, |
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bool force_create_version) { |
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assert(cfd->initialized()); |
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if (force_create_version) { |
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auto builder_iter = builders_.find(cfd->GetID()); |
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assert(builder_iter != builders_.end()); |
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auto* builder = builder_iter->second->version_builder(); |
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auto* v = new Version(cfd, version_set_, version_set_->file_options_, |
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*cfd->GetLatestMutableCFOptions(), |
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version_set_->current_version_number_++); |
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builder->SaveTo(v->storage_info()); |
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// Install new version
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v->PrepareApply(*cfd->GetLatestMutableCFOptions(), |
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!(version_set_->db_options_->skip_stats_update_on_db_open)); |
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version_set_->AppendVersion(cfd, v); |
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} |
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return Status::OK(); |
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} |
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Status VersionEditHandler::LoadTables(ColumnFamilyData* cfd, |
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bool prefetch_index_and_filter_in_cache, |
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bool is_initial_load) { |
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assert(cfd != nullptr); |
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assert(!cfd->IsDropped()); |
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Status s; |
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auto builder_iter = builders_.find(cfd->GetID()); |
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assert(builder_iter != builders_.end()); |
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assert(builder_iter->second != nullptr); |
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VersionBuilder* builder = builder_iter->second->version_builder(); |
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assert(builder); |
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s = builder->LoadTableHandlers( |
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cfd->internal_stats(), |
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version_set_->db_options_->max_file_opening_threads, |
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prefetch_index_and_filter_in_cache, is_initial_load, |
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cfd->GetLatestMutableCFOptions()->prefix_extractor.get()); |
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if (s.IsPathNotFound() && no_error_if_table_files_missing_) { |
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s = Status::OK(); |
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} |
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if (!s.ok() && !version_set_->db_options_->paranoid_checks) { |
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s = Status::OK(); |
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} |
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return s; |
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} |
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Status VersionEditHandler::ExtractInfoFromVersionEdit(ColumnFamilyData* cfd, |
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const VersionEdit& edit) { |
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Status s; |
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if (cfd != nullptr) { |
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if (edit.has_db_id_) { |
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version_edit_params_.SetDBId(edit.db_id_); |
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} |
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if (edit.has_log_number_) { |
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if (cfd->GetLogNumber() > edit.log_number_) { |
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ROCKS_LOG_WARN( |
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version_set_->db_options()->info_log, |
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"MANIFEST corruption detected, but ignored - Log numbers in " |
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"records NOT monotonically increasing"); |
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} else { |
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cfd->SetLogNumber(edit.log_number_); |
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version_edit_params_.SetLogNumber(edit.log_number_); |
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} |
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} |
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if (edit.has_comparator_ && |
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edit.comparator_ != cfd->user_comparator()->Name()) { |
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s = Status::InvalidArgument( |
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cfd->user_comparator()->Name(), |
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"does not match existing comparator " + edit.comparator_); |
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} |
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} |
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if (s.ok()) { |
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if (edit.has_prev_log_number_) { |
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version_edit_params_.SetPrevLogNumber(edit.prev_log_number_); |
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} |
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if (edit.has_next_file_number_) { |
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version_edit_params_.SetNextFile(edit.next_file_number_); |
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} |
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if (edit.has_max_column_family_) { |
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version_edit_params_.SetMaxColumnFamily(edit.max_column_family_); |
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} |
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if (edit.has_min_log_number_to_keep_) { |
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version_edit_params_.min_log_number_to_keep_ = |
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std::max(version_edit_params_.min_log_number_to_keep_, |
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edit.min_log_number_to_keep_); |
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} |
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if (edit.has_last_sequence_) { |
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version_edit_params_.SetLastSequence(edit.last_sequence_); |
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} |
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if (!version_edit_params_.has_prev_log_number_) { |
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version_edit_params_.SetPrevLogNumber(0); |
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} |
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} |
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return s; |
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} |
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VersionEditHandlerPointInTime::VersionEditHandlerPointInTime( |
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bool read_only, const std::vector<ColumnFamilyDescriptor>& column_families, |
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VersionSet* version_set) |
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: VersionEditHandler(read_only, column_families, version_set, |
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/*track_missing_files=*/true, |
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/*no_error_if_table_files_missing=*/true) {} |
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VersionEditHandlerPointInTime::~VersionEditHandlerPointInTime() { |
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for (const auto& elem : versions_) { |
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delete elem.second; |
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} |
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versions_.clear(); |
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} |
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void VersionEditHandlerPointInTime::CheckIterationResult( |
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const log::Reader& reader, Status* s) { |
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VersionEditHandler::CheckIterationResult(reader, s); |
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assert(s != nullptr); |
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if (s->ok()) { |
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for (auto* cfd : *(version_set_->column_family_set_)) { |
||||
if (cfd->IsDropped()) { |
||||
continue; |
||||
} |
||||
assert(cfd->initialized()); |
||||
auto v_iter = versions_.find(cfd->GetID()); |
||||
if (v_iter != versions_.end()) { |
||||
assert(v_iter->second != nullptr); |
||||
|
||||
version_set_->AppendVersion(cfd, v_iter->second); |
||||
versions_.erase(v_iter); |
||||
} |
||||
} |
||||
} |
||||
} |
||||
|
||||
ColumnFamilyData* VersionEditHandlerPointInTime::DestroyCfAndCleanup( |
||||
const VersionEdit& edit) { |
||||
ColumnFamilyData* cfd = VersionEditHandler::DestroyCfAndCleanup(edit); |
||||
auto v_iter = versions_.find(edit.column_family_); |
||||
if (v_iter != versions_.end()) { |
||||
delete v_iter->second; |
||||
versions_.erase(v_iter); |
||||
} |
||||
return cfd; |
||||
} |
||||
|
||||
Status VersionEditHandlerPointInTime::MaybeCreateVersion( |
||||
const VersionEdit& edit, ColumnFamilyData* cfd, bool force_create_version) { |
||||
assert(cfd != nullptr); |
||||
if (!force_create_version) { |
||||
assert(edit.column_family_ == cfd->GetID()); |
||||
} |
||||
auto missing_files_iter = cf_to_missing_files_.find(cfd->GetID()); |
||||
assert(missing_files_iter != cf_to_missing_files_.end()); |
||||
std::unordered_set<uint64_t>& missing_files = missing_files_iter->second; |
||||
const bool prev_has_missing_files = !missing_files.empty(); |
||||
for (const auto& file : edit.GetDeletedFiles()) { |
||||
uint64_t file_num = file.second; |
||||
auto fiter = missing_files.find(file_num); |
||||
if (fiter != missing_files.end()) { |
||||
missing_files.erase(fiter); |
||||
} |
||||
} |
||||
Status s; |
||||
for (const auto& elem : edit.GetNewFiles()) { |
||||
const FileMetaData& meta = elem.second; |
||||
const FileDescriptor& fd = meta.fd; |
||||
uint64_t file_num = fd.GetNumber(); |
||||
const std::string fpath = |
||||
MakeTableFileName(cfd->ioptions()->cf_paths[0].path, file_num); |
||||
s = version_set_->VerifyFileMetadata(fpath, meta); |
||||
if (s.IsPathNotFound() || s.IsNotFound()) { |
||||
missing_files.insert(file_num); |
||||
s = Status::OK(); |
||||
} |
||||
} |
||||
bool missing_info = !version_edit_params_.has_log_number_ || |
||||
!version_edit_params_.has_next_file_number_ || |
||||
!version_edit_params_.has_last_sequence_; |
||||
|
||||
// Create version before apply edit
|
||||
if (!missing_info && ((!missing_files.empty() && !prev_has_missing_files) || |
||||
(missing_files.empty() && force_create_version))) { |
||||
auto builder_iter = builders_.find(cfd->GetID()); |
||||
assert(builder_iter != builders_.end()); |
||||
auto* builder = builder_iter->second->version_builder(); |
||||
auto* version = new Version(cfd, version_set_, version_set_->file_options_, |
||||
*cfd->GetLatestMutableCFOptions(), |
||||
version_set_->current_version_number_++); |
||||
builder->SaveTo(version->storage_info()); |
||||
version->PrepareApply( |
||||
*cfd->GetLatestMutableCFOptions(), |
||||
!version_set_->db_options_->skip_stats_update_on_db_open); |
||||
auto v_iter = versions_.find(cfd->GetID()); |
||||
if (v_iter != versions_.end()) { |
||||
delete v_iter->second; |
||||
v_iter->second = version; |
||||
} else { |
||||
versions_.emplace(cfd->GetID(), version); |
||||
} |
||||
} |
||||
return s; |
||||
} |
||||
|
||||
} // namespace ROCKSDB_NAMESPACE
|
||||
@ -0,0 +1,123 @@ |
||||
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
|
||||
// This source code is licensed under both the GPLv2 (found in the
|
||||
// COPYING file in the root directory) and Apache 2.0 License
|
||||
// (found in the LICENSE.Apache file in the root directory).
|
||||
//
|
||||
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style license that can be
|
||||
// found in the LICENSE file. See the AUTHORS file for names of contributors.
|
||||
|
||||
#pragma once |
||||
|
||||
#include "db/version_builder.h" |
||||
#include "db/version_edit.h" |
||||
#include "db/version_set.h" |
||||
|
||||
namespace ROCKSDB_NAMESPACE { |
||||
|
||||
typedef std::unique_ptr<BaseReferencedVersionBuilder> VersionBuilderUPtr; |
||||
|
||||
// A class used for scanning MANIFEST file.
|
||||
// VersionEditHandler reads a MANIFEST file, parses the version edits, and
|
||||
// builds the version set's in-memory state, e.g. the version storage info for
|
||||
// the versions of column families.
|
||||
// To use this class and its subclasses,
|
||||
// 1. Create an object of VersionEditHandler or its subclasses.
|
||||
// VersionEditHandler handler(read_only, column_families, version_set,
|
||||
// track_missing_files, ignore_missing_files);
|
||||
// 2. Status s = handler.Iterate(reader, &db_id);
|
||||
// 3. Check s and handle possible errors.
|
||||
//
|
||||
// Not thread-safe, external synchronization is necessary if an object of
|
||||
// VersionEditHandler is shared by multiple threads.
|
||||
class VersionEditHandler { |
||||
public: |
||||
explicit VersionEditHandler( |
||||
bool read_only, |
||||
const std::vector<ColumnFamilyDescriptor>& column_families, |
||||
VersionSet* version_set, bool track_missing_files, |
||||
bool ignore_missing_files); |
||||
|
||||
virtual ~VersionEditHandler() {} |
||||
|
||||
Status Iterate(log::Reader& reader, std::string* db_id); |
||||
|
||||
const Status& status() const { return status_; } |
||||
|
||||
bool HasMissingFiles() const; |
||||
|
||||
protected: |
||||
Status ApplyVersionEdit(VersionEdit& edit, ColumnFamilyData** cfd); |
||||
|
||||
Status OnColumnFamilyAdd(VersionEdit& edit, ColumnFamilyData** cfd); |
||||
|
||||
Status OnColumnFamilyDrop(VersionEdit& edit, ColumnFamilyData** cfd); |
||||
|
||||
Status OnNonCfOperation(VersionEdit& edit, ColumnFamilyData** cfd); |
||||
|
||||
Status Initialize(); |
||||
|
||||
void CheckColumnFamilyId(const VersionEdit& edit, bool* cf_in_not_found, |
||||
bool* cf_in_builders) const; |
||||
|
||||
virtual void CheckIterationResult(const log::Reader& reader, Status* s); |
||||
|
||||
ColumnFamilyData* CreateCfAndInit(const ColumnFamilyOptions& cf_options, |
||||
const VersionEdit& edit); |
||||
|
||||
virtual ColumnFamilyData* DestroyCfAndCleanup(const VersionEdit& edit); |
||||
|
||||
virtual Status MaybeCreateVersion(const VersionEdit& edit, |
||||
ColumnFamilyData* cfd, |
||||
bool force_create_version); |
||||
|
||||
Status LoadTables(ColumnFamilyData* cfd, |
||||
bool prefetch_index_and_filter_in_cache, |
||||
bool is_initial_load); |
||||
|
||||
const bool read_only_; |
||||
const std::vector<ColumnFamilyDescriptor>& column_families_; |
||||
Status status_; |
||||
VersionSet* version_set_; |
||||
AtomicGroupReadBuffer read_buffer_; |
||||
std::unordered_map<uint32_t, VersionBuilderUPtr> builders_; |
||||
std::unordered_map<std::string, ColumnFamilyOptions> name_to_options_; |
||||
std::unordered_map<uint32_t, std::string> column_families_not_found_; |
||||
VersionEditParams version_edit_params_; |
||||
const bool track_missing_files_; |
||||
std::unordered_map<uint32_t, std::unordered_set<uint64_t>> |
||||
cf_to_missing_files_; |
||||
bool no_error_if_table_files_missing_; |
||||
|
||||
private: |
||||
Status ExtractInfoFromVersionEdit(ColumnFamilyData* cfd, |
||||
const VersionEdit& edit); |
||||
|
||||
bool initialized_; |
||||
}; |
||||
|
||||
// A class similar to its base class, i.e. VersionEditHandler.
|
||||
// VersionEditHandlerPointInTime restores the versions to the most recent point
|
||||
// in time such that at this point, the version does not have missing files.
|
||||
//
|
||||
// Not thread-safe, external synchronization is necessary if an object of
|
||||
// VersionEditHandlerPointInTime is shared by multiple threads.
|
||||
class VersionEditHandlerPointInTime : public VersionEditHandler { |
||||
public: |
||||
VersionEditHandlerPointInTime( |
||||
bool read_only, |
||||
const std::vector<ColumnFamilyDescriptor>& column_families, |
||||
VersionSet* version_set); |
||||
~VersionEditHandlerPointInTime() override; |
||||
|
||||
protected: |
||||
void CheckIterationResult(const log::Reader& reader, Status* s) override; |
||||
ColumnFamilyData* DestroyCfAndCleanup(const VersionEdit& edit) override; |
||||
Status MaybeCreateVersion(const VersionEdit& edit, ColumnFamilyData* cfd, |
||||
bool force_create_version) override; |
||||
|
||||
private: |
||||
std::unordered_map<uint32_t, Version*> versions_; |
||||
}; |
||||
|
||||
} // namespace ROCKSDB_NAMESPACE
|
||||
Loading…
Reference in new issue