Summary: Add a utility function that trigger necessary full compaction and put output to the correct level by looking at new options and old options. Test Plan: Add unit tests for it. Reviewers: andrewkr, igor, IslamAbdelRahman Reviewed By: IslamAbdelRahman Subscribers: muthu, sumeet, leveldb, andrewkr, dhruba Differential Revision: https://reviews.facebook.net/D60783main
sdong
8 years ago
parent
5bb0a7f73d
commit
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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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#pragma once |
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#include <string> |
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#include "rocksdb/options.h" |
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#include "rocksdb/status.h" |
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namespace rocksdb { |
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// Try to migrate DB created with old_opts to be use new_opts.
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// Multiple column families is not supported.
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// It is best-effort. No guarantee to succeed.
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// A full compaction may be executed.
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Status OptionChangeMigration(std::string dbname, const Options& old_opts, |
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const Options& new_opts); |
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} // namespace rocksdb
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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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#include "rocksdb/utilities/option_change_migration.h" |
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#ifndef ROCKSDB_LITE |
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#include "rocksdb/db.h" |
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namespace rocksdb { |
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namespace { |
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// Return a version of Options `opts` that allow us to open/write into a DB
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// without triggering an automatic compaction or stalling. This is guaranteed
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// by disabling automatic compactions and using huge values for stalling
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// triggers.
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Options GetNoCompactionOptions(const Options& opts) { |
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Options ret_opts = opts; |
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ret_opts.disable_auto_compactions = true; |
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ret_opts.level0_slowdown_writes_trigger = 999999; |
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ret_opts.level0_stop_writes_trigger = 999999; |
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ret_opts.soft_pending_compaction_bytes_limit = 0; |
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ret_opts.hard_pending_compaction_bytes_limit = 0; |
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return ret_opts; |
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} |
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Status OpenDb(const Options& options, const std::string& dbname, |
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std::unique_ptr<DB>* db) { |
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db->reset(); |
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DB* tmpdb; |
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Status s = DB::Open(options, dbname, &tmpdb); |
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if (s.ok()) { |
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db->reset(tmpdb); |
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} |
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return s; |
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} |
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Status CompactToLevel(const Options& options, const std::string& dbname, |
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int dest_level, bool need_reopen) { |
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std::unique_ptr<DB> db; |
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Options no_compact_opts = GetNoCompactionOptions(options); |
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if (dest_level == 0) { |
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// L0 has strict sequenceID requirements to files to it. It's safer
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// to only put one compacted file to there.
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// This is only used for converting to universal compaction with
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// only one level. In this case, compacting to one file is also
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// optimal.
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no_compact_opts.target_file_size_base = 999999999999999; |
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} |
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Status s = OpenDb(no_compact_opts, dbname, &db); |
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if (!s.ok()) { |
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return s; |
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} |
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CompactRangeOptions cro; |
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cro.change_level = true; |
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cro.target_level = dest_level; |
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db->CompactRange(cro, nullptr, nullptr); |
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if (need_reopen) { |
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// Need to restart DB to rewrite the manifest file.
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// In order to open a DB with specific num_levels, the manifest file should
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// contain no record that mentiones any level beyond num_levels. Issuing a
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// full compaction will move all the data to a level not exceeding
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// num_levels, but the manifest may still contain previous record mentioning
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// a higher level. Reopening the DB will force the manifest to be rewritten
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// so that those records will be cleared.
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db.reset(); |
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s = OpenDb(no_compact_opts, dbname, &db); |
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} |
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return s; |
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} |
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Status MigrateToUniversal(std::string dbname, const Options& old_opts, |
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const Options& new_opts) { |
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if (old_opts.num_levels <= new_opts.num_levels) { |
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return Status::OK(); |
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} else { |
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bool need_compact = false; |
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{ |
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std::unique_ptr<DB> db; |
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Options opts = GetNoCompactionOptions(old_opts); |
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Status s = OpenDb(opts, dbname, &db); |
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if (!s.ok()) { |
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return s; |
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} |
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ColumnFamilyMetaData metadata; |
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db->GetColumnFamilyMetaData(&metadata); |
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if (!metadata.levels.empty() && |
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metadata.levels.back().level >= new_opts.num_levels) { |
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need_compact = true; |
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} |
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} |
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if (need_compact) { |
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return CompactToLevel(old_opts, dbname, new_opts.num_levels - 1, true); |
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} |
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return Status::OK(); |
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} |
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} |
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Status MigrateToLevelBase(std::string dbname, const Options& old_opts, |
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const Options& new_opts) { |
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if (!new_opts.level_compaction_dynamic_level_bytes) { |
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if (old_opts.num_levels == 1) { |
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return Status::OK(); |
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} |
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// Compact everything to level 1 to guarantee it can be safely opened.
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Options opts = old_opts; |
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opts.target_file_size_base = new_opts.target_file_size_base; |
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// Although sometimes we can open the DB with the new option without error,
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// We still want to compact the files to avoid the LSM tree to stuck
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// in bad shape. For example, if the user changed the level size
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// multiplier from 4 to 8, with the same data, we will have fewer
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// levels. Unless we issue a full comaction, the LSM tree may stuck
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// with more levels than needed and it won't recover automatically.
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return CompactToLevel(opts, dbname, 1, true); |
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} else { |
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// Compact everything to the last level to guarantee it can be safely
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// opened.
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if (old_opts.num_levels == 1) { |
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return Status::OK(); |
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} else if (new_opts.num_levels > old_opts.num_levels) { |
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// Dynamic level mode requires data to be put in the last level first.
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return CompactToLevel(new_opts, dbname, new_opts.num_levels - 1, false); |
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} else { |
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Options opts = old_opts; |
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opts.target_file_size_base = new_opts.target_file_size_base; |
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return CompactToLevel(opts, dbname, new_opts.num_levels - 1, true); |
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} |
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} |
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} |
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} // namespace
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Status OptionChangeMigration(std::string dbname, const Options& old_opts, |
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const Options& new_opts) { |
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if (new_opts.compaction_style == CompactionStyle::kCompactionStyleUniversal) { |
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return MigrateToUniversal(dbname, old_opts, new_opts); |
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} else if (new_opts.compaction_style == |
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CompactionStyle::kCompactionStyleLevel) { |
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return MigrateToLevelBase(dbname, old_opts, new_opts); |
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} else { |
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return Status::NotSupported( |
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"Do not how to migrate to this compaction style"); |
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} |
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} |
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} // namespace rocksdb
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#else |
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namespace rocksdb { |
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Status OptionChangeMigration(std::string dbname, const Options& old_opts, |
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const Options& new_opts) { |
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return Status::NotSupported(); |
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} |
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} // namespace rocksdb
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#endif // ROCKSDB_LITE
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@ -0,0 +1,207 @@ |
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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same 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 "rocksdb/utilities/option_change_migration.h" |
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#include <set> |
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#include "db/db_test_util.h" |
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#include "port/stack_trace.h" |
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namespace rocksdb { |
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class DBOptionChangeMigrationTest |
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: public DBTestBase, |
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public testing::WithParamInterface< |
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std::tuple<int, bool, bool, int, bool, bool>> { |
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public: |
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DBOptionChangeMigrationTest() |
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: DBTestBase("/db_option_change_migration_test") { |
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level1_ = std::get<0>(GetParam()); |
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is_universal1_ = std::get<1>(GetParam()); |
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is_dynamic1_ = std::get<2>(GetParam()); |
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level2_ = std::get<3>(GetParam()); |
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is_universal2_ = std::get<4>(GetParam()); |
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is_dynamic2_ = std::get<5>(GetParam()); |
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} |
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// Required if inheriting from testing::WithParamInterface<>
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static void SetUpTestCase() {} |
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static void TearDownTestCase() {} |
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int level1_; |
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bool is_universal1_; |
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bool is_dynamic1_; |
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int level2_; |
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bool is_universal2_; |
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bool is_dynamic2_; |
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}; |
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#ifndef ROCKSDB_LITE |
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TEST_P(DBOptionChangeMigrationTest, Migrate1) { |
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Options old_options = CurrentOptions(); |
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if (is_universal1_) { |
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old_options.compaction_style = CompactionStyle::kCompactionStyleUniversal; |
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} else { |
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old_options.compaction_style = CompactionStyle::kCompactionStyleLevel; |
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old_options.level_compaction_dynamic_level_bytes = is_dynamic1_; |
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} |
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old_options.level0_file_num_compaction_trigger = 3; |
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old_options.write_buffer_size = 64 * 1024; |
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old_options.target_file_size_base = 128 * 1024; |
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// Make level target of L1, L2 to be 200KB and 600KB
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old_options.num_levels = level1_; |
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old_options.max_bytes_for_level_multiplier = 3; |
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old_options.max_bytes_for_level_base = 200 * 1024; |
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Reopen(old_options); |
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Random rnd(301); |
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int key_idx = 0; |
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// Generate at least 2MB of data
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for (int num = 0; num < 20; num++) { |
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GenerateNewFile(&rnd, &key_idx); |
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} |
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dbfull()->TEST_WaitForFlushMemTable(); |
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dbfull()->TEST_WaitForCompact(); |
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// Will make sure exactly those keys are in the DB after migration.
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std::set<std::string> keys; |
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{ |
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std::unique_ptr<Iterator> it(db_->NewIterator(ReadOptions())); |
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it->SeekToFirst(); |
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for (; it->Valid(); it->Next()) { |
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keys.insert(it->key().ToString()); |
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} |
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} |
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Close(); |
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Options new_options = old_options; |
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if (is_universal2_) { |
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new_options.compaction_style = CompactionStyle::kCompactionStyleUniversal; |
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} else { |
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new_options.compaction_style = CompactionStyle::kCompactionStyleLevel; |
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new_options.level_compaction_dynamic_level_bytes = is_dynamic2_; |
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} |
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new_options.target_file_size_base = 256 * 1024; |
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new_options.num_levels = level2_; |
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new_options.max_bytes_for_level_base = 150 * 1024; |
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new_options.max_bytes_for_level_multiplier = 4; |
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ASSERT_OK(OptionChangeMigration(dbname_, old_options, new_options)); |
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Reopen(new_options); |
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// Wait for compaction to finish and make sure it can reopen
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dbfull()->TEST_WaitForFlushMemTable(); |
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dbfull()->TEST_WaitForCompact(); |
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Reopen(new_options); |
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{ |
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std::unique_ptr<Iterator> it(db_->NewIterator(ReadOptions())); |
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it->SeekToFirst(); |
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for (std::string key : keys) { |
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ASSERT_TRUE(it->Valid()); |
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ASSERT_EQ(key, it->key().ToString()); |
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it->Next(); |
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} |
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ASSERT_TRUE(!it->Valid()); |
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} |
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} |
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TEST_P(DBOptionChangeMigrationTest, Migrate2) { |
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Options old_options = CurrentOptions(); |
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if (is_universal2_) { |
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old_options.compaction_style = CompactionStyle::kCompactionStyleUniversal; |
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} else { |
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old_options.compaction_style = CompactionStyle::kCompactionStyleLevel; |
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old_options.level_compaction_dynamic_level_bytes = is_dynamic2_; |
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} |
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old_options.level0_file_num_compaction_trigger = 3; |
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old_options.write_buffer_size = 64 * 1024; |
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old_options.target_file_size_base = 128 * 1024; |
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// Make level target of L1, L2 to be 200KB and 600KB
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old_options.num_levels = level2_; |
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old_options.max_bytes_for_level_multiplier = 3; |
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old_options.max_bytes_for_level_base = 200 * 1024; |
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Reopen(old_options); |
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Random rnd(301); |
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int key_idx = 0; |
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// Generate at least 2MB of data
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for (int num = 0; num < 20; num++) { |
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GenerateNewFile(&rnd, &key_idx); |
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} |
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dbfull()->TEST_WaitForFlushMemTable(); |
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dbfull()->TEST_WaitForCompact(); |
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// Will make sure exactly those keys are in the DB after migration.
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std::set<std::string> keys; |
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{ |
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std::unique_ptr<Iterator> it(db_->NewIterator(ReadOptions())); |
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it->SeekToFirst(); |
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for (; it->Valid(); it->Next()) { |
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keys.insert(it->key().ToString()); |
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} |
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} |
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Close(); |
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Options new_options = old_options; |
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if (is_universal1_) { |
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new_options.compaction_style = CompactionStyle::kCompactionStyleUniversal; |
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} else { |
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new_options.compaction_style = CompactionStyle::kCompactionStyleLevel; |
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new_options.level_compaction_dynamic_level_bytes = is_dynamic1_; |
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} |
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new_options.target_file_size_base = 256 * 1024; |
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new_options.num_levels = level1_; |
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new_options.max_bytes_for_level_base = 150 * 1024; |
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new_options.max_bytes_for_level_multiplier = 4; |
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ASSERT_OK(OptionChangeMigration(dbname_, old_options, new_options)); |
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Reopen(new_options); |
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// Wait for compaction to finish and make sure it can reopen
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dbfull()->TEST_WaitForFlushMemTable(); |
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dbfull()->TEST_WaitForCompact(); |
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Reopen(new_options); |
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{ |
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std::unique_ptr<Iterator> it(db_->NewIterator(ReadOptions())); |
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it->SeekToFirst(); |
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for (std::string key : keys) { |
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ASSERT_TRUE(it->Valid()); |
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ASSERT_EQ(key, it->key().ToString()); |
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it->Next(); |
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} |
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ASSERT_TRUE(!it->Valid()); |
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} |
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} |
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INSTANTIATE_TEST_CASE_P( |
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DBOptionChangeMigrationTest, DBOptionChangeMigrationTest, |
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::testing::Values(std::make_tuple(3, false, false, 4, false, false), |
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std::make_tuple(3, false, true, 4, false, true), |
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std::make_tuple(3, false, true, 4, false, false), |
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std::make_tuple(3, false, false, 4, false, true), |
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std::make_tuple(3, true, false, 4, true, false), |
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std::make_tuple(1, true, false, 4, true, false), |
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std::make_tuple(3, false, false, 4, true, false), |
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std::make_tuple(3, false, false, 1, true, false), |
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std::make_tuple(3, false, true, 4, true, false), |
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std::make_tuple(3, false, true, 1, true, false), |
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std::make_tuple(1, true, false, 4, false, false))); |
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#endif // ROCKSDB_LITE
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} // namespace rocksdb
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int main(int argc, char** argv) { |
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rocksdb::port::InstallStackTraceHandler(); |
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::testing::InitGoogleTest(&argc, argv); |
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return RUN_ALL_TESTS(); |
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} |
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