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rocksdb/db/version_edit.cc
Maysam Yabandeh 73f21a7b21 Skip deleted WALs during recovery 
Summary:
This patch record the deleted WAL numbers in the manifest to ignore them and any WAL older than them during recovery. This is to avoid scenarios when we have a gap between the WAL files are fed to the recovery procedure. The gap could happen by for example out-of-order WAL deletion. Such gap could cause problems in 2PC recovery where the prepared and commit entry are placed into two separate WAL and gap in the WALs could result into not processing the WAL with the commit entry and hence breaking the 2PC recovery logic.
Closes https://github.com/facebook/rocksdb/pull/3488

Differential Revision: D6967893

Pulled By: maysamyabandeh

fbshipit-source-id: 13119feb155a08ab6d4909f437c7a750480dc8a1
2018-03-30 11:28:05 -07:00

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// 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.
#include "db/version_edit.h"
#include "db/version_set.h"
#include "rocksdb/slice.h"
#include "util/coding.h"
#include "util/event_logger.h"
#include "util/string_util.h"
#include "util/sync_point.h"
namespace rocksdb {
// Tag numbers for serialized VersionEdit. These numbers are written to
// disk and should not be changed.
enum Tag {
kComparator = 1,
kLogNumber = 2,
kNextFileNumber = 3,
kLastSequence = 4,
kCompactPointer = 5,
kDeletedFile = 6,
kNewFile = 7,
// 8 was used for large value refs
kPrevLogNumber = 9,
kDeletedLogNumber = 10,
// these are new formats divergent from open source leveldb
kNewFile2 = 100,
kNewFile3 = 102,
kNewFile4 = 103, // 4th (the latest) format version of adding files
kColumnFamily = 200, // specify column family for version edit
kColumnFamilyAdd = 201,
kColumnFamilyDrop = 202,
kMaxColumnFamily = 203,
};
enum CustomTag {
kTerminate = 1, // The end of customized fields
kNeedCompaction = 2,
// Since Manifest is not entirely currently forward-compatible, and the only
// forward-compatbile part is the CutsomtTag of kNewFile, we currently encode
// kDeletedLogNumber as part of a CustomTag as a hack. This should be removed
// when manifest becomes forward-comptabile.
kDeletedLogNumberHack = 3,
kPathId = 65,
};
// If this bit for the custom tag is set, opening DB should fail if
// we don't know this field.
uint32_t kCustomTagNonSafeIgnoreMask = 1 << 6;
uint64_t PackFileNumberAndPathId(uint64_t number, uint64_t path_id) {
assert(number <= kFileNumberMask);
return number | (path_id * (kFileNumberMask + 1));
}
void VersionEdit::Clear() {
comparator_.clear();
max_level_ = 0;
log_number_ = 0;
prev_log_number_ = 0;
last_sequence_ = 0;
next_file_number_ = 0;
max_column_family_ = 0;
deleted_log_number_ = 0;
has_comparator_ = false;
has_log_number_ = false;
has_prev_log_number_ = false;
has_next_file_number_ = false;
has_last_sequence_ = false;
has_max_column_family_ = false;
has_deleted_log_number_ = false;
deleted_files_.clear();
new_files_.clear();
column_family_ = 0;
is_column_family_add_ = 0;
is_column_family_drop_ = 0;
column_family_name_.clear();
}
bool VersionEdit::EncodeTo(std::string* dst) const {
if (has_comparator_) {
PutVarint32(dst, kComparator);
PutLengthPrefixedSlice(dst, comparator_);
}
if (has_log_number_) {
PutVarint32Varint64(dst, kLogNumber, log_number_);
}
if (has_prev_log_number_) {
PutVarint32Varint64(dst, kPrevLogNumber, prev_log_number_);
}
if (has_next_file_number_) {
PutVarint32Varint64(dst, kNextFileNumber, next_file_number_);
}
if (has_last_sequence_) {
PutVarint32Varint64(dst, kLastSequence, last_sequence_);
}
if (has_max_column_family_) {
PutVarint32Varint32(dst, kMaxColumnFamily, max_column_family_);
}
if (has_deleted_log_number_) {
// TODO(myabandeh): uncomment me when manifest is forward-compatible
// PutVarint32Varint64(dst, kDeletedLogNumber, deleted_log_number_);
// Since currently manifest is not forward compatible we encode this entry
// disguised as a kNewFile4 entry which has forward-compatible extensions.
PutVarint32(dst, kNewFile4);
PutVarint32Varint64(dst, 0u, 0ull); // level and number
PutVarint64(dst, 0ull); // file size
InternalKey dummy_key(Slice("dummy_key"), 0ull, ValueType::kTypeValue);
PutLengthPrefixedSlice(dst, dummy_key.Encode()); // smallest
PutLengthPrefixedSlice(dst, dummy_key.Encode()); // largest
PutVarint64Varint64(dst, 0ull, 0ull); // smallest_seqno and largerst
PutVarint32(dst, CustomTag::kDeletedLogNumberHack);
std::string buf;
PutFixed64(&buf, deleted_log_number_);
PutLengthPrefixedSlice(dst, Slice(buf));
PutVarint32(dst, CustomTag::kTerminate);
}
for (const auto& deleted : deleted_files_) {
PutVarint32Varint32Varint64(dst, kDeletedFile, deleted.first /* level */,
deleted.second /* file number */);
}
for (size_t i = 0; i < new_files_.size(); i++) {
const FileMetaData& f = new_files_[i].second;
if (!f.smallest.Valid() || !f.largest.Valid()) {
return false;
}
bool has_customized_fields = false;
if (f.marked_for_compaction) {
PutVarint32(dst, kNewFile4);
has_customized_fields = true;
} else if (f.fd.GetPathId() == 0) {
// Use older format to make sure user can roll back the build if they
// don't config multiple DB paths.
PutVarint32(dst, kNewFile2);
} else {
PutVarint32(dst, kNewFile3);
}
PutVarint32Varint64(dst, new_files_[i].first /* level */, f.fd.GetNumber());
if (f.fd.GetPathId() != 0 && !has_customized_fields) {
// kNewFile3
PutVarint32(dst, f.fd.GetPathId());
}
PutVarint64(dst, f.fd.GetFileSize());
PutLengthPrefixedSlice(dst, f.smallest.Encode());
PutLengthPrefixedSlice(dst, f.largest.Encode());
PutVarint64Varint64(dst, f.smallest_seqno, f.largest_seqno);
if (has_customized_fields) {
// Customized fields' format:
// +-----------------------------+
// | 1st field's tag (varint32) |
// +-----------------------------+
// | 1st field's size (varint32) |
// +-----------------------------+
// | bytes for 1st field |
// | (based on size decoded) |
// +-----------------------------+
// | |
// | ...... |
// | |
// +-----------------------------+
// | last field's size (varint32)|
// +-----------------------------+
// | bytes for last field |
// | (based on size decoded) |
// +-----------------------------+
// | terminating tag (varint32) |
// +-----------------------------+
//
// Customized encoding for fields:
// tag kPathId: 1 byte as path_id
// tag kNeedCompaction:
// now only can take one char value 1 indicating need-compaction
//
if (f.fd.GetPathId() != 0) {
PutVarint32(dst, CustomTag::kPathId);
char p = static_cast<char>(f.fd.GetPathId());
PutLengthPrefixedSlice(dst, Slice(&p, 1));
}
if (f.marked_for_compaction) {
PutVarint32(dst, CustomTag::kNeedCompaction);
char p = static_cast<char>(1);
PutLengthPrefixedSlice(dst, Slice(&p, 1));
}
TEST_SYNC_POINT_CALLBACK("VersionEdit::EncodeTo:NewFile4:CustomizeFields",
dst);
PutVarint32(dst, CustomTag::kTerminate);
}
}
// 0 is default and does not need to be explicitly written
if (column_family_ != 0) {
PutVarint32Varint32(dst, kColumnFamily, column_family_);
}
if (is_column_family_add_) {
PutVarint32(dst, kColumnFamilyAdd);
PutLengthPrefixedSlice(dst, Slice(column_family_name_));
}
if (is_column_family_drop_) {
PutVarint32(dst, kColumnFamilyDrop);
}
return true;
}
static bool GetInternalKey(Slice* input, InternalKey* dst) {
Slice str;
if (GetLengthPrefixedSlice(input, &str)) {
dst->DecodeFrom(str);
return dst->Valid();
} else {
return false;
}
}
bool VersionEdit::GetLevel(Slice* input, int* level, const char** /*msg*/) {
uint32_t v;
if (GetVarint32(input, &v)) {
*level = v;
if (max_level_ < *level) {
max_level_ = *level;
}
return true;
} else {
return false;
}
}
const char* VersionEdit::DecodeNewFile4From(Slice* input) {
const char* msg = nullptr;
int level;
FileMetaData f;
uint64_t number;
uint32_t path_id = 0;
uint64_t file_size;
// Since this is the only forward-compatible part of the code, we hack new
// extension into this record. When we do, we set this boolean to distinguish
// the record from the normal NewFile records.
bool this_is_not_a_new_file_record = false;
if (GetLevel(input, &level, &msg) && GetVarint64(input, &number) &&
GetVarint64(input, &file_size) && GetInternalKey(input, &f.smallest) &&
GetInternalKey(input, &f.largest) &&
GetVarint64(input, &f.smallest_seqno) &&
GetVarint64(input, &f.largest_seqno)) {
// See comments in VersionEdit::EncodeTo() for format of customized fields
while (true) {
uint32_t custom_tag;
Slice field;
if (!GetVarint32(input, &custom_tag)) {
return "new-file4 custom field";
}
if (custom_tag == kTerminate) {
break;
}
if (!GetLengthPrefixedSlice(input, &field)) {
return "new-file4 custom field lenth prefixed slice error";
}
switch (custom_tag) {
case kPathId:
if (field.size() != 1) {
return "path_id field wrong size";
}
path_id = field[0];
if (path_id > 3) {
return "path_id wrong vaue";
}
break;
case kNeedCompaction:
if (field.size() != 1) {
return "need_compaction field wrong size";
}
f.marked_for_compaction = (field[0] == 1);
break;
case kDeletedLogNumberHack:
// This is a hack to encode kDeletedLogNumber in a forward-compatbile
// fashion.
this_is_not_a_new_file_record = true;
if (!GetFixed64(&field, &deleted_log_number_)) {
return "deleted log number malformatted";
}
has_deleted_log_number_ = true;
break;
default:
if ((custom_tag & kCustomTagNonSafeIgnoreMask) != 0) {
// Should not proceed if cannot understand it
return "new-file4 custom field not supported";
}
break;
}
}
} else {
return "new-file4 entry";
}
if (this_is_not_a_new_file_record) {
// Since this has nothing to do with NewFile, return immediately.
return nullptr;
}
f.fd = FileDescriptor(number, path_id, file_size);
new_files_.push_back(std::make_pair(level, f));
return nullptr;
}
Status VersionEdit::DecodeFrom(const Slice& src) {
Clear();
Slice input = src;
const char* msg = nullptr;
uint32_t tag;
// Temporary storage for parsing
int level;
FileMetaData f;
Slice str;
InternalKey key;
while (msg == nullptr && GetVarint32(&input, &tag)) {
switch (tag) {
case kComparator:
if (GetLengthPrefixedSlice(&input, &str)) {
comparator_ = str.ToString();
has_comparator_ = true;
} else {
msg = "comparator name";
}
break;
case kLogNumber:
if (GetVarint64(&input, &log_number_)) {
has_log_number_ = true;
} else {
msg = "log number";
}
break;
case kPrevLogNumber:
if (GetVarint64(&input, &prev_log_number_)) {
has_prev_log_number_ = true;
} else {
msg = "previous log number";
}
break;
case kNextFileNumber:
if (GetVarint64(&input, &next_file_number_)) {
has_next_file_number_ = true;
} else {
msg = "next file number";
}
break;
case kLastSequence:
if (GetVarint64(&input, &last_sequence_)) {
has_last_sequence_ = true;
} else {
msg = "last sequence number";
}
break;
case kMaxColumnFamily:
if (GetVarint32(&input, &max_column_family_)) {
has_max_column_family_ = true;
} else {
msg = "max column family";
}
break;
case kDeletedLogNumber:
if (GetVarint64(&input, &deleted_log_number_)) {
has_deleted_log_number_ = true;
} else {
msg = "deleted log number";
}
break;
case kCompactPointer:
if (GetLevel(&input, &level, &msg) &&
GetInternalKey(&input, &key)) {
// we don't use compact pointers anymore,
// but we should not fail if they are still
// in manifest
} else {
if (!msg) {
msg = "compaction pointer";
}
}
break;
case kDeletedFile: {
uint64_t number;
if (GetLevel(&input, &level, &msg) && GetVarint64(&input, &number)) {
deleted_files_.insert(std::make_pair(level, number));
} else {
if (!msg) {
msg = "deleted file";
}
}
break;
}
case kNewFile: {
uint64_t number;
uint64_t file_size;
if (GetLevel(&input, &level, &msg) && GetVarint64(&input, &number) &&
GetVarint64(&input, &file_size) &&
GetInternalKey(&input, &f.smallest) &&
GetInternalKey(&input, &f.largest)) {
f.fd = FileDescriptor(number, 0, file_size);
new_files_.push_back(std::make_pair(level, f));
} else {
if (!msg) {
msg = "new-file entry";
}
}
break;
}
case kNewFile2: {
uint64_t number;
uint64_t file_size;
if (GetLevel(&input, &level, &msg) && GetVarint64(&input, &number) &&
GetVarint64(&input, &file_size) &&
GetInternalKey(&input, &f.smallest) &&
GetInternalKey(&input, &f.largest) &&
GetVarint64(&input, &f.smallest_seqno) &&
GetVarint64(&input, &f.largest_seqno)) {
f.fd = FileDescriptor(number, 0, file_size);
new_files_.push_back(std::make_pair(level, f));
} else {
if (!msg) {
msg = "new-file2 entry";
}
}
break;
}
case kNewFile3: {
uint64_t number;
uint32_t path_id;
uint64_t file_size;
if (GetLevel(&input, &level, &msg) && GetVarint64(&input, &number) &&
GetVarint32(&input, &path_id) && GetVarint64(&input, &file_size) &&
GetInternalKey(&input, &f.smallest) &&
GetInternalKey(&input, &f.largest) &&
GetVarint64(&input, &f.smallest_seqno) &&
GetVarint64(&input, &f.largest_seqno)) {
f.fd = FileDescriptor(number, path_id, file_size);
new_files_.push_back(std::make_pair(level, f));
} else {
if (!msg) {
msg = "new-file3 entry";
}
}
break;
}
case kNewFile4: {
msg = DecodeNewFile4From(&input);
break;
}
case kColumnFamily:
if (!GetVarint32(&input, &column_family_)) {
if (!msg) {
msg = "set column family id";
}
}
break;
case kColumnFamilyAdd:
if (GetLengthPrefixedSlice(&input, &str)) {
is_column_family_add_ = true;
column_family_name_ = str.ToString();
} else {
if (!msg) {
msg = "column family add";
}
}
break;
case kColumnFamilyDrop:
is_column_family_drop_ = true;
break;
default:
msg = "unknown tag";
break;
}
}
if (msg == nullptr && !input.empty()) {
msg = "invalid tag";
}
Status result;
if (msg != nullptr) {
result = Status::Corruption("VersionEdit", msg);
}
return result;
}
std::string VersionEdit::DebugString(bool hex_key) const {
std::string r;
r.append("VersionEdit {");
if (has_comparator_) {
r.append("\n Comparator: ");
r.append(comparator_);
}
if (has_log_number_) {
r.append("\n LogNumber: ");
AppendNumberTo(&r, log_number_);
}
if (has_prev_log_number_) {
r.append("\n PrevLogNumber: ");
AppendNumberTo(&r, prev_log_number_);
}
if (has_next_file_number_) {
r.append("\n NextFileNumber: ");
AppendNumberTo(&r, next_file_number_);
}
if (has_last_sequence_) {
r.append("\n LastSeq: ");
AppendNumberTo(&r, last_sequence_);
}
for (DeletedFileSet::const_iterator iter = deleted_files_.begin();
iter != deleted_files_.end();
++iter) {
r.append("\n DeleteFile: ");
AppendNumberTo(&r, iter->first);
r.append(" ");
AppendNumberTo(&r, iter->second);
}
for (size_t i = 0; i < new_files_.size(); i++) {
const FileMetaData& f = new_files_[i].second;
r.append("\n AddFile: ");
AppendNumberTo(&r, new_files_[i].first);
r.append(" ");
AppendNumberTo(&r, f.fd.GetNumber());
r.append(" ");
AppendNumberTo(&r, f.fd.GetFileSize());
r.append(" ");
r.append(f.smallest.DebugString(hex_key));
r.append(" .. ");
r.append(f.largest.DebugString(hex_key));
}
r.append("\n ColumnFamily: ");
AppendNumberTo(&r, column_family_);
if (is_column_family_add_) {
r.append("\n ColumnFamilyAdd: ");
r.append(column_family_name_);
}
if (is_column_family_drop_) {
r.append("\n ColumnFamilyDrop");
}
if (has_max_column_family_) {
r.append("\n MaxColumnFamily: ");
AppendNumberTo(&r, max_column_family_);
}
if (has_deleted_log_number_) {
r.append("\n DeletedLogNumber: ");
AppendNumberTo(&r, deleted_log_number_);
}
r.append("\n}\n");
return r;
}
std::string VersionEdit::DebugJSON(int edit_num, bool hex_key) const {
JSONWriter jw;
jw << "EditNumber" << edit_num;
if (has_comparator_) {
jw << "Comparator" << comparator_;
}
if (has_log_number_) {
jw << "LogNumber" << log_number_;
}
if (has_prev_log_number_) {
jw << "PrevLogNumber" << prev_log_number_;
}
if (has_next_file_number_) {
jw << "NextFileNumber" << next_file_number_;
}
if (has_last_sequence_) {
jw << "LastSeq" << last_sequence_;
}
if (!deleted_files_.empty()) {
jw << "DeletedFiles";
jw.StartArray();
for (DeletedFileSet::const_iterator iter = deleted_files_.begin();
iter != deleted_files_.end();
++iter) {
jw.StartArrayedObject();
jw << "Level" << iter->first;
jw << "FileNumber" << iter->second;
jw.EndArrayedObject();
}
jw.EndArray();
}
if (!new_files_.empty()) {
jw << "AddedFiles";
jw.StartArray();
for (size_t i = 0; i < new_files_.size(); i++) {
jw.StartArrayedObject();
jw << "Level" << new_files_[i].first;
const FileMetaData& f = new_files_[i].second;
jw << "FileNumber" << f.fd.GetNumber();
jw << "FileSize" << f.fd.GetFileSize();
jw << "SmallestIKey" << f.smallest.DebugString(hex_key);
jw << "LargestIKey" << f.largest.DebugString(hex_key);
jw.EndArrayedObject();
}
jw.EndArray();
}
jw << "ColumnFamily" << column_family_;
if (is_column_family_add_) {
jw << "ColumnFamilyAdd" << column_family_name_;
}
if (is_column_family_drop_) {
jw << "ColumnFamilyDrop" << column_family_name_;
}
if (has_max_column_family_) {
jw << "MaxColumnFamily" << max_column_family_;
}
if (has_deleted_log_number_) {
jw << "DeletedLogNumber" << deleted_log_number_;
}
jw.EndObject();
return jw.Get();
}
} // namespace rocksdb
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