cd48ecaa1a
Summary: `WalAddition`, `WalDeletion` are defined in `wal_version.h` and used in `VersionEdit`. `WalAddition` is used to represent events of creating a new WAL (no size, just log number), or closing a WAL (with size). `WalDeletion` is used to represent events of deleting or archiving a WAL, it means the WAL is no longer alive (won't be replayed during recovery). `WalSet` is the set of alive WALs kept in `VersionSet`. 1. Why use `WalDeletion` instead of relying on `MinLogNumber` to identify outdated WALs On recovery, we can compute `MinLogNumber()` based on the log numbers kept in MANIFEST, any log with number < MinLogNumber can be ignored. So it seems that we don't need to persist `WalDeletion` to MANIFEST, since we can ignore the WALs based on MinLogNumber. But the `MinLogNumber()` is actually a lower bound, it does not exactly mean that logs starting from MinLogNumber must exist. This is because in a corner case, when a column family is empty and never flushed, its log number is set to the largest log number, but not persisted in MANIFEST. So let's say there are 2 column families, when creating the DB, the first WAL has log number 1, so it's persisted to MANIFEST for both column families. Then CF 0 is empty and never flushed, CF 1 is updated and flushed, so a new WAL with log number 2 is created and persisted to MANIFEST for CF 1. But CF 0's log number in MANIFEST is still 1. So on recovery, MinLogNumber is 1, but since log 1 only contains data for CF 1, and CF 1 is flushed, log 1 might have already been deleted from disk. We can make `MinLogNumber()` be the exactly minimum log number that must exist, by persisting the most recent log number for empty column families that are not flushed. But if there are N such column families, then every time a new WAL is created, we need to add N records to MANIFEST. In current design, a record is persisted to MANIFEST only when WAL is created, closed, or deleted/archived, so the number of WAL related records are bounded to 3x number of WALs. 2. Why keep `WalSet` in `VersionSet` instead of applying the `VersionEdit`s to `VersionStorageInfo` `VersionEdit`s are originally designed to track the addition and deletion of SST files. The SST files are related to column families, each column family has a list of `Version`s, and each `Version` keeps the set of active SST files in `VersionStorageInfo`. But WALs are a concept of DB, they are not bounded to specific column families. So logically it does not make sense to store WALs in a column family's `Version`s. Also, `Version`'s purpose is to keep reference to SST / blob files, so that they are not deleted until there is no version referencing them. But a WAL is deleted regardless of version references. So we keep the WALs in `VersionSet` for the purpose of writing out the DB state's snapshot when creating new MANIFESTs. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7164 Test Plan: make version_edit_test && ./version_edit_test make wal_edit_test && ./wal_edit_test Reviewed By: ltamasi Differential Revision: D22677936 Pulled By: cheng-chang fbshipit-source-id: 5a3b6890140e572ffd79eb37e6e4c3c32361a859
523 lines
17 KiB
C++
523 lines
17 KiB
C++
// 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.h"
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#include "test_util/sync_point.h"
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#include "test_util/testharness.h"
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#include "util/coding.h"
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#include "util/string_util.h"
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namespace ROCKSDB_NAMESPACE {
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static void TestEncodeDecode(const VersionEdit& edit) {
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std::string encoded, encoded2;
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edit.EncodeTo(&encoded);
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VersionEdit parsed;
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Status s = parsed.DecodeFrom(encoded);
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ASSERT_TRUE(s.ok()) << s.ToString();
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parsed.EncodeTo(&encoded2);
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ASSERT_EQ(encoded, encoded2);
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}
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class VersionEditTest : public testing::Test {};
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TEST_F(VersionEditTest, EncodeDecode) {
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static const uint64_t kBig = 1ull << 50;
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static const uint32_t kBig32Bit = 1ull << 30;
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VersionEdit edit;
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for (int i = 0; i < 4; i++) {
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TestEncodeDecode(edit);
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edit.AddFile(3, kBig + 300 + i, kBig32Bit + 400 + i, 0,
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InternalKey("foo", kBig + 500 + i, kTypeValue),
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InternalKey("zoo", kBig + 600 + i, kTypeDeletion),
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kBig + 500 + i, kBig + 600 + i, false, kInvalidBlobFileNumber,
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888, 678, "234", "crc32c");
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edit.DeleteFile(4, kBig + 700 + i);
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}
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edit.SetComparatorName("foo");
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edit.SetLogNumber(kBig + 100);
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edit.SetNextFile(kBig + 200);
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edit.SetLastSequence(kBig + 1000);
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TestEncodeDecode(edit);
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}
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TEST_F(VersionEditTest, EncodeDecodeNewFile4) {
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static const uint64_t kBig = 1ull << 50;
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VersionEdit edit;
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edit.AddFile(3, 300, 3, 100, InternalKey("foo", kBig + 500, kTypeValue),
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InternalKey("zoo", kBig + 600, kTypeDeletion), kBig + 500,
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kBig + 600, true, kInvalidBlobFileNumber,
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kUnknownOldestAncesterTime, kUnknownFileCreationTime,
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kUnknownFileChecksum, kUnknownFileChecksumFuncName);
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edit.AddFile(4, 301, 3, 100, InternalKey("foo", kBig + 501, kTypeValue),
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InternalKey("zoo", kBig + 601, kTypeDeletion), kBig + 501,
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kBig + 601, false, kInvalidBlobFileNumber,
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kUnknownOldestAncesterTime, kUnknownFileCreationTime,
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kUnknownFileChecksum, kUnknownFileChecksumFuncName);
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edit.AddFile(5, 302, 0, 100, InternalKey("foo", kBig + 502, kTypeValue),
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InternalKey("zoo", kBig + 602, kTypeDeletion), kBig + 502,
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kBig + 602, true, kInvalidBlobFileNumber, 666, 888,
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kUnknownFileChecksum, kUnknownFileChecksumFuncName);
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edit.AddFile(5, 303, 0, 100, InternalKey("foo", kBig + 503, kTypeBlobIndex),
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InternalKey("zoo", kBig + 603, kTypeBlobIndex), kBig + 503,
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kBig + 603, true, 1001, kUnknownOldestAncesterTime,
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kUnknownFileCreationTime, kUnknownFileChecksum,
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kUnknownFileChecksumFuncName);
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;
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edit.DeleteFile(4, 700);
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edit.SetComparatorName("foo");
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edit.SetLogNumber(kBig + 100);
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edit.SetNextFile(kBig + 200);
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edit.SetLastSequence(kBig + 1000);
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TestEncodeDecode(edit);
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std::string encoded, encoded2;
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edit.EncodeTo(&encoded);
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VersionEdit parsed;
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Status s = parsed.DecodeFrom(encoded);
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ASSERT_TRUE(s.ok()) << s.ToString();
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auto& new_files = parsed.GetNewFiles();
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ASSERT_TRUE(new_files[0].second.marked_for_compaction);
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ASSERT_TRUE(!new_files[1].second.marked_for_compaction);
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ASSERT_TRUE(new_files[2].second.marked_for_compaction);
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ASSERT_TRUE(new_files[3].second.marked_for_compaction);
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ASSERT_EQ(3u, new_files[0].second.fd.GetPathId());
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ASSERT_EQ(3u, new_files[1].second.fd.GetPathId());
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ASSERT_EQ(0u, new_files[2].second.fd.GetPathId());
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ASSERT_EQ(0u, new_files[3].second.fd.GetPathId());
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ASSERT_EQ(kInvalidBlobFileNumber,
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new_files[0].second.oldest_blob_file_number);
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ASSERT_EQ(kInvalidBlobFileNumber,
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new_files[1].second.oldest_blob_file_number);
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ASSERT_EQ(kInvalidBlobFileNumber,
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new_files[2].second.oldest_blob_file_number);
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ASSERT_EQ(1001, new_files[3].second.oldest_blob_file_number);
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}
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TEST_F(VersionEditTest, ForwardCompatibleNewFile4) {
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static const uint64_t kBig = 1ull << 50;
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VersionEdit edit;
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edit.AddFile(3, 300, 3, 100, InternalKey("foo", kBig + 500, kTypeValue),
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InternalKey("zoo", kBig + 600, kTypeDeletion), kBig + 500,
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kBig + 600, true, kInvalidBlobFileNumber,
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kUnknownOldestAncesterTime, kUnknownFileCreationTime,
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kUnknownFileChecksum, kUnknownFileChecksumFuncName);
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edit.AddFile(4, 301, 3, 100, InternalKey("foo", kBig + 501, kTypeValue),
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InternalKey("zoo", kBig + 601, kTypeDeletion), kBig + 501,
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kBig + 601, false, kInvalidBlobFileNumber, 686, 868, "234",
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"crc32c");
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edit.DeleteFile(4, 700);
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edit.SetComparatorName("foo");
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edit.SetLogNumber(kBig + 100);
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edit.SetNextFile(kBig + 200);
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edit.SetLastSequence(kBig + 1000);
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std::string encoded;
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// Call back function to add extra customized builds.
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bool first = true;
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ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
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"VersionEdit::EncodeTo:NewFile4:CustomizeFields", [&](void* arg) {
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std::string* str = reinterpret_cast<std::string*>(arg);
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PutVarint32(str, 33);
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const std::string str1 = "random_string";
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PutLengthPrefixedSlice(str, str1);
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if (first) {
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first = false;
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PutVarint32(str, 22);
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const std::string str2 = "s";
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PutLengthPrefixedSlice(str, str2);
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}
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});
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ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
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edit.EncodeTo(&encoded);
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ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
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VersionEdit parsed;
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Status s = parsed.DecodeFrom(encoded);
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ASSERT_TRUE(s.ok()) << s.ToString();
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ASSERT_TRUE(!first);
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auto& new_files = parsed.GetNewFiles();
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ASSERT_TRUE(new_files[0].second.marked_for_compaction);
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ASSERT_TRUE(!new_files[1].second.marked_for_compaction);
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ASSERT_EQ(3u, new_files[0].second.fd.GetPathId());
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ASSERT_EQ(3u, new_files[1].second.fd.GetPathId());
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ASSERT_EQ(1u, parsed.GetDeletedFiles().size());
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}
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TEST_F(VersionEditTest, NewFile4NotSupportedField) {
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static const uint64_t kBig = 1ull << 50;
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VersionEdit edit;
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edit.AddFile(3, 300, 3, 100, InternalKey("foo", kBig + 500, kTypeValue),
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InternalKey("zoo", kBig + 600, kTypeDeletion), kBig + 500,
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kBig + 600, true, kInvalidBlobFileNumber,
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kUnknownOldestAncesterTime, kUnknownFileCreationTime,
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kUnknownFileChecksum, kUnknownFileChecksumFuncName);
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edit.SetComparatorName("foo");
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edit.SetLogNumber(kBig + 100);
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edit.SetNextFile(kBig + 200);
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edit.SetLastSequence(kBig + 1000);
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std::string encoded;
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// Call back function to add extra customized builds.
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ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->SetCallBack(
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"VersionEdit::EncodeTo:NewFile4:CustomizeFields", [&](void* arg) {
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std::string* str = reinterpret_cast<std::string*>(arg);
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const std::string str1 = "s";
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PutLengthPrefixedSlice(str, str1);
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});
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ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->EnableProcessing();
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edit.EncodeTo(&encoded);
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ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
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VersionEdit parsed;
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Status s = parsed.DecodeFrom(encoded);
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ASSERT_NOK(s);
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}
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TEST_F(VersionEditTest, EncodeEmptyFile) {
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VersionEdit edit;
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edit.AddFile(0, 0, 0, 0, InternalKey(), InternalKey(), 0, 0, false,
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kInvalidBlobFileNumber, kUnknownOldestAncesterTime,
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kUnknownFileCreationTime, kUnknownFileChecksum,
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kUnknownFileChecksumFuncName);
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std::string buffer;
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ASSERT_TRUE(!edit.EncodeTo(&buffer));
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}
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TEST_F(VersionEditTest, ColumnFamilyTest) {
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VersionEdit edit;
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edit.SetColumnFamily(2);
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edit.AddColumnFamily("column_family");
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edit.SetMaxColumnFamily(5);
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TestEncodeDecode(edit);
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edit.Clear();
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edit.SetColumnFamily(3);
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edit.DropColumnFamily();
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TestEncodeDecode(edit);
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}
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TEST_F(VersionEditTest, MinLogNumberToKeep) {
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VersionEdit edit;
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edit.SetMinLogNumberToKeep(13);
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TestEncodeDecode(edit);
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edit.Clear();
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edit.SetMinLogNumberToKeep(23);
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TestEncodeDecode(edit);
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}
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TEST_F(VersionEditTest, AtomicGroupTest) {
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VersionEdit edit;
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edit.MarkAtomicGroup(1);
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TestEncodeDecode(edit);
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}
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TEST_F(VersionEditTest, IgnorableField) {
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VersionEdit ve;
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std::string encoded;
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// Size of ignorable field is too large
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PutVarint32Varint64(&encoded, 2 /* kLogNumber */, 66);
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// This is a customized ignorable tag
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PutVarint32Varint64(&encoded,
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0x2710 /* A field with kTagSafeIgnoreMask set */,
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5 /* fieldlength 5 */);
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encoded += "abc"; // Only fills 3 bytes,
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ASSERT_NOK(ve.DecodeFrom(encoded));
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encoded.clear();
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// Error when seeing unidentified tag that is not ignorable
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PutVarint32Varint64(&encoded, 2 /* kLogNumber */, 66);
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// This is a customized ignorable tag
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PutVarint32Varint64(&encoded, 666 /* A field with kTagSafeIgnoreMask unset */,
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3 /* fieldlength 3 */);
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encoded += "abc"; // Fill 3 bytes
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PutVarint32Varint64(&encoded, 3 /* next file number */, 88);
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ASSERT_NOK(ve.DecodeFrom(encoded));
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// Safely ignore an identified but safely ignorable entry
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encoded.clear();
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PutVarint32Varint64(&encoded, 2 /* kLogNumber */, 66);
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// This is a customized ignorable tag
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PutVarint32Varint64(&encoded,
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0x2710 /* A field with kTagSafeIgnoreMask set */,
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3 /* fieldlength 3 */);
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encoded += "abc"; // Fill 3 bytes
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PutVarint32Varint64(&encoded, 3 /* kNextFileNumber */, 88);
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ASSERT_OK(ve.DecodeFrom(encoded));
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ASSERT_TRUE(ve.HasLogNumber());
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ASSERT_TRUE(ve.HasNextFile());
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ASSERT_EQ(66, ve.GetLogNumber());
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ASSERT_EQ(88, ve.GetNextFile());
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}
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TEST_F(VersionEditTest, DbId) {
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VersionEdit edit;
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edit.SetDBId("ab34-cd12-435f-er00");
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TestEncodeDecode(edit);
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edit.Clear();
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edit.SetDBId("34ba-cd12-435f-er01");
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TestEncodeDecode(edit);
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}
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TEST_F(VersionEditTest, BlobFileAdditionAndGarbage) {
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VersionEdit edit;
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const std::string checksum_method_prefix = "Hash";
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const std::string checksum_value_prefix = "Value";
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for (uint64_t blob_file_number = 1; blob_file_number <= 10;
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++blob_file_number) {
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const uint64_t total_blob_count = blob_file_number << 10;
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const uint64_t total_blob_bytes = blob_file_number << 20;
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std::string checksum_method(checksum_method_prefix);
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AppendNumberTo(&checksum_method, blob_file_number);
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std::string checksum_value(checksum_value_prefix);
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AppendNumberTo(&checksum_value, blob_file_number);
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edit.AddBlobFile(blob_file_number, total_blob_count, total_blob_bytes,
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checksum_method, checksum_value);
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const uint64_t garbage_blob_count = total_blob_count >> 2;
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const uint64_t garbage_blob_bytes = total_blob_bytes >> 1;
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edit.AddBlobFileGarbage(blob_file_number, garbage_blob_count,
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garbage_blob_bytes);
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}
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TestEncodeDecode(edit);
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}
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TEST_F(VersionEditTest, AddWalEncodeDecode) {
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VersionEdit edit;
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for (uint64_t log_number = 1; log_number <= 20; log_number++) {
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WalMetadata meta(rand() % 100);
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bool has_size = rand() % 2 == 0;
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if (has_size) {
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meta.SetSizeInBytes(rand() % 1000);
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}
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edit.AddWal(log_number, meta);
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}
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TestEncodeDecode(edit);
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}
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TEST_F(VersionEditTest, AddWalDecodeBadLogNumber) {
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std::string encoded;
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PutVarint32(&encoded, Tag::kWalAddition);
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{
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// No log number.
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VersionEdit edit;
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Status s = edit.DecodeFrom(encoded);
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ASSERT_TRUE(s.IsCorruption());
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ASSERT_TRUE(s.ToString().find("Error decoding WAL log number") !=
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std::string::npos)
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<< s.ToString();
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}
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{
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// log number should be varint64,
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// but we only encode 128 which is not a valid representation of varint64.
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char c = 0;
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unsigned char* ptr = reinterpret_cast<unsigned char*>(&c);
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*ptr = 128;
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encoded.append(1, c);
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VersionEdit edit;
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Status s = edit.DecodeFrom(encoded);
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ASSERT_TRUE(s.IsCorruption());
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ASSERT_TRUE(s.ToString().find("Error decoding WAL log number") !=
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std::string::npos)
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<< s.ToString();
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}
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}
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TEST_F(VersionEditTest, AddWalDecodeBadTag) {
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constexpr WalNumber kLogNumber = 100;
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constexpr uint64_t kSizeInBytes = 100;
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std::string encoded_without_tag;
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PutVarint32(&encoded_without_tag, Tag::kWalAddition);
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PutVarint64(&encoded_without_tag, kLogNumber);
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{
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// No tag.
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VersionEdit edit;
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Status s = edit.DecodeFrom(encoded_without_tag);
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ASSERT_TRUE(s.IsCorruption());
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ASSERT_TRUE(s.ToString().find("Error decoding tag") != std::string::npos)
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<< s.ToString();
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}
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{
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// Only has size tag, no terminate tag.
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std::string encoded_with_size = encoded_without_tag;
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PutVarint32(&encoded_with_size,
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static_cast<uint32_t>(WalAdditionTag::kSize));
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PutVarint64(&encoded_with_size, kSizeInBytes);
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VersionEdit edit;
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Status s = edit.DecodeFrom(encoded_with_size);
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ASSERT_TRUE(s.IsCorruption());
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ASSERT_TRUE(s.ToString().find("Error decoding tag") != std::string::npos)
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<< s.ToString();
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}
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{
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// Only has terminate tag.
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std::string encoded_with_terminate = encoded_without_tag;
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PutVarint32(&encoded_with_terminate,
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static_cast<uint32_t>(WalAdditionTag::kTerminate));
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VersionEdit edit;
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ASSERT_OK(edit.DecodeFrom(encoded_with_terminate));
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auto& wal_addition = edit.GetWalAdditions()[0];
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ASSERT_EQ(wal_addition.GetLogNumber(), kLogNumber);
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ASSERT_FALSE(wal_addition.GetMetadata().HasSize());
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}
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}
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TEST_F(VersionEditTest, AddWalDecodeNoSize) {
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constexpr WalNumber kLogNumber = 100;
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std::string encoded;
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PutVarint32(&encoded, Tag::kWalAddition);
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PutVarint64(&encoded, kLogNumber);
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PutVarint32(&encoded, static_cast<uint32_t>(WalAdditionTag::kSize));
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// No real size after the size tag.
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{
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// Without terminate tag.
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VersionEdit edit;
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Status s = edit.DecodeFrom(encoded);
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ASSERT_TRUE(s.IsCorruption());
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ASSERT_TRUE(s.ToString().find("Error decoding WAL file size") !=
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std::string::npos)
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<< s.ToString();
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}
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{
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// With terminate tag.
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PutVarint32(&encoded, static_cast<uint32_t>(WalAdditionTag::kTerminate));
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VersionEdit edit;
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Status s = edit.DecodeFrom(encoded);
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ASSERT_TRUE(s.IsCorruption());
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// The terminate tag is misunderstood as the size.
|
|
ASSERT_TRUE(s.ToString().find("Error decoding tag") != std::string::npos)
|
|
<< s.ToString();
|
|
}
|
|
}
|
|
|
|
TEST_F(VersionEditTest, AddWalDebug) {
|
|
constexpr int n = 2;
|
|
constexpr std::array<uint64_t, n> kLogNumbers{{10, 20}};
|
|
constexpr std::array<uint64_t, n> kSizeInBytes{{100, 200}};
|
|
|
|
VersionEdit edit;
|
|
for (int i = 0; i < n; i++) {
|
|
edit.AddWal(kLogNumbers[i], WalMetadata(kSizeInBytes[i]));
|
|
}
|
|
|
|
const WalAdditions& wals = edit.GetWalAdditions();
|
|
|
|
ASSERT_TRUE(edit.HasWalAddition());
|
|
ASSERT_EQ(wals.size(), n);
|
|
for (int i = 0; i < n; i++) {
|
|
const WalAddition& wal = wals[i];
|
|
ASSERT_EQ(wal.GetLogNumber(), kLogNumbers[i]);
|
|
ASSERT_EQ(wal.GetMetadata().GetSizeInBytes(), kSizeInBytes[i]);
|
|
}
|
|
|
|
std::string expected_str = "VersionEdit {\n";
|
|
for (int i = 0; i < n; i++) {
|
|
std::stringstream ss;
|
|
ss << " WalAddition: log_number: " << kLogNumbers[i]
|
|
<< " size_in_bytes: " << kSizeInBytes[i] << "\n";
|
|
expected_str += ss.str();
|
|
}
|
|
expected_str += " ColumnFamily: 0\n}\n";
|
|
ASSERT_EQ(edit.DebugString(true), expected_str);
|
|
|
|
std::string expected_json = "{\"EditNumber\": 4, \"WalAdditions\": [";
|
|
for (int i = 0; i < n; i++) {
|
|
std::stringstream ss;
|
|
ss << "{\"LogNumber\": " << kLogNumbers[i] << ", "
|
|
<< "\"SizeInBytes\": " << kSizeInBytes[i] << "}";
|
|
if (i < n - 1) ss << ", ";
|
|
expected_json += ss.str();
|
|
}
|
|
expected_json += "], \"ColumnFamily\": 0}";
|
|
ASSERT_EQ(edit.DebugJSON(4, true), expected_json);
|
|
}
|
|
|
|
TEST_F(VersionEditTest, DeleteWalEncodeDecode) {
|
|
VersionEdit edit;
|
|
for (uint64_t log_number = 1; log_number <= 20; log_number++) {
|
|
edit.DeleteWal(log_number);
|
|
}
|
|
TestEncodeDecode(edit);
|
|
}
|
|
|
|
TEST_F(VersionEditTest, DeleteWalDebug) {
|
|
constexpr int n = 2;
|
|
constexpr std::array<uint64_t, n> kLogNumbers{{10, 20}};
|
|
|
|
VersionEdit edit;
|
|
for (int i = 0; i < n; i++) {
|
|
edit.DeleteWal(kLogNumbers[i]);
|
|
}
|
|
|
|
const WalDeletions& wals = edit.GetWalDeletions();
|
|
|
|
ASSERT_TRUE(edit.HasWalDeletion());
|
|
ASSERT_EQ(wals.size(), n);
|
|
for (int i = 0; i < n; i++) {
|
|
const WalDeletion& wal = wals[i];
|
|
ASSERT_EQ(wal.GetLogNumber(), kLogNumbers[i]);
|
|
}
|
|
|
|
std::string expected_str = "VersionEdit {\n";
|
|
for (int i = 0; i < n; i++) {
|
|
std::stringstream ss;
|
|
ss << " WalDeletion: log_number: " << kLogNumbers[i] << "\n";
|
|
expected_str += ss.str();
|
|
}
|
|
expected_str += " ColumnFamily: 0\n}\n";
|
|
ASSERT_EQ(edit.DebugString(true), expected_str);
|
|
|
|
std::string expected_json = "{\"EditNumber\": 4, \"WalDeletions\": [";
|
|
for (int i = 0; i < n; i++) {
|
|
std::stringstream ss;
|
|
ss << "{\"LogNumber\": " << kLogNumbers[i] << "}";
|
|
if (i < n - 1) ss << ", ";
|
|
expected_json += ss.str();
|
|
}
|
|
expected_json += "], \"ColumnFamily\": 0}";
|
|
ASSERT_EQ(edit.DebugJSON(4, true), expected_json);
|
|
}
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|
|
|
|
int main(int argc, char** argv) {
|
|
::testing::InitGoogleTest(&argc, argv);
|
|
return RUN_ALL_TESTS();
|
|
}
|