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Merge pull request #746 from ceph/wip-recycle

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Add Options.recycle_log_file_num for Recycling WAL Files
main
Siying Dong 9 years ago
parent 581f20fd8b a7b2bedfb0
commit 138876a62c
29 changed files with 572 additions and 225 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 5
      db/c.cc
  2. 2
      db/compaction_job_test.cc
  3. 66
      db/db_impl.cc
  4. 2
      db/db_impl.h
  5. 4
      db/db_test.cc
  6. 4
      db/db_test_util.cc
  7. 7
      db/db_test_util.h
  8. 2
      db/flush_job_test.cc
  9. 14
      db/log_format.h
  10. 125
      db/log_reader.cc
  11. 27
      db/log_reader.h
  12. 214
      db/log_test.cc
  13. 66
      db/log_writer.cc
  14. 16
      db/log_writer.h
  15. 6
      db/repair.cc
  16. 6
      db/transaction_log_impl.cc
  17. 17
      db/version_set.cc
  18. 4
      db/wal_manager.cc
  19. 5
      db/wal_manager_test.cc
  20. 2
      include/rocksdb/c.h
  21. 6
      include/rocksdb/env.h
  22. 10
      include/rocksdb/options.h
  23. 53
      java/rocksjni/options.cc
  24. 16
      tools/ldb_cmd.cc
  25. 11
      util/env.cc
  26. 44
      util/env_posix.cc
  27. 4
      util/options.cc
  28. 3
      util/options_helper.h
  29. 6
      util/options_test.cc

5
db/c.cc
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@ -1687,6 +1687,11 @@ void rocksdb_options_set_keep_log_file_num(rocksdb_options_t* opt, size_t v) {
opt->rep.keep_log_file_num = v;
}
void rocksdb_options_set_recycle_log_file_num(rocksdb_options_t* opt,
size_t v) {
opt->rep.recycle_log_file_num = v;
}
void rocksdb_options_set_soft_rate_limit(rocksdb_options_t* opt, double v) {
opt->rep.soft_rate_limit = v;
}

2
db/compaction_job_test.cc
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@ -198,7 +198,7 @@ class CompactionJobTest : public testing::Test {
unique_ptr<WritableFileWriter> file_writer(
new WritableFileWriter(std::move(file), env_options_));
{
log::Writer log(std::move(file_writer));
log::Writer log(std::move(file_writer), 0, false);
std::string record;
new_db.EncodeTo(&record);
s = log.AddRecord(record);

66
db/db_impl.cc
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@ -150,6 +150,10 @@ DBOptions SanitizeOptions(const std::string& dbname, const DBOptions& src) {
}
}
if (result.WAL_ttl_seconds > 0 || result.WAL_size_limit_MB > 0) {
result.recycle_log_file_num = false;
}
if (result.wal_dir.empty()) {
// Use dbname as default
result.wal_dir = dbname;
@ -416,7 +420,7 @@ Status DBImpl::NewDB() {
file->SetPreallocationBlockSize(db_options_.manifest_preallocation_size);
unique_ptr<WritableFileWriter> file_writer(
new WritableFileWriter(std::move(file), env_options));
log::Writer log(std::move(file_writer));
log::Writer log(std::move(file_writer), 0, false);
std::string record;
new_db.EncodeTo(&record);
s = log.AddRecord(record);
@ -601,7 +605,13 @@ void DBImpl::FindObsoleteFiles(JobContext* job_context, bool force,
// find newly obsoleted log files
while (alive_log_files_.begin()->number < min_log_number) {
auto& earliest = *alive_log_files_.begin();
if (db_options_.recycle_log_file_num > log_recycle_files.size()) {
Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
"adding log %" PRIu64 " to recycle list\n", earliest.number);
log_recycle_files.push_back(earliest.number);
} else {
job_context->log_delete_files.push_back(earliest.number);
}
total_log_size_ -= earliest.size;
alive_log_files_.pop_front();
// Current log should always stay alive since it can't have
@ -1109,28 +1119,13 @@ Status DBImpl::RecoverLogFiles(const std::vector<uint64_t>& log_numbers,
// paranoid_checks==false so that corruptions cause entire commits
// to be skipped instead of propagating bad information (like overly
// large sequence numbers).
log::Reader reader(std::move(file_reader), &reporter, true /*checksum*/,
0 /*initial_offset*/);
log::Reader reader(db_options_.info_log, std::move(file_reader), &reporter,
true /*checksum*/, 0 /*initial_offset*/, log_number);
Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
"Recovering log #%" PRIu64 " mode %d skip-recovery %d", log_number,
db_options_.wal_recovery_mode, !continue_replay_log);
// Determine if we should tolerate incomplete records at the tail end of the
// log
bool report_eof_inconsistency;
if (db_options_.wal_recovery_mode ==
WALRecoveryMode::kAbsoluteConsistency) {
// in clean shutdown we don't expect any error in the log files
report_eof_inconsistency = true;
} else {
// for other modes ignore only incomplete records in the last log file
// which is presumably due to write in progress during restart
report_eof_inconsistency = false;
// TODO krad: Evaluate if we need to move to a more strict mode where we
// restrict the inconsistency to only the last log
}
// Read all the records and add to a memtable
std::string scratch;
Slice record;
@ -1145,8 +1140,9 @@ Status DBImpl::RecoverLogFiles(const std::vector<uint64_t>& log_numbers,
}
}
while (continue_replay_log &&
reader.ReadRecord(&record, &scratch, report_eof_inconsistency) &&
while (
continue_replay_log &&
reader.ReadRecord(&record, &scratch, db_options_.wal_recovery_mode) &&
status.ok()) {
if (record.size() < 12) {
reporter.Corruption(record.size(),
@ -4072,6 +4068,12 @@ Status DBImpl::SwitchMemtable(ColumnFamilyData* cfd, WriteContext* context) {
// Do this without holding the dbmutex lock.
assert(versions_->prev_log_number() == 0);
bool creating_new_log = !log_empty_;
uint64_t recycle_log_number = 0;
if (creating_new_log && db_options_.recycle_log_file_num &&
!log_recycle_files.empty()) {
recycle_log_number = log_recycle_files.front();
log_recycle_files.pop_front();
}
uint64_t new_log_number =
creating_new_log ? versions_->NewFileNumber() : logfile_number_;
SuperVersion* new_superversion = nullptr;
@ -4082,17 +4084,28 @@ Status DBImpl::SwitchMemtable(ColumnFamilyData* cfd, WriteContext* context) {
if (creating_new_log) {
EnvOptions opt_env_opt =
env_->OptimizeForLogWrite(env_options_, db_options_);
if (recycle_log_number) {
Log(InfoLogLevel::INFO_LEVEL, db_options_.info_log,
"reusing log %" PRIu64 " from recycle list\n", recycle_log_number);
s = env_->ReuseWritableFile(
LogFileName(db_options_.wal_dir, new_log_number),
LogFileName(db_options_.wal_dir, recycle_log_number), &lfile,
opt_env_opt);
} else {
s = NewWritableFile(env_,
LogFileName(db_options_.wal_dir, new_log_number),
&lfile, opt_env_opt);
}
if (s.ok()) {
// Our final size should be less than write_buffer_size
// (compression, etc) but err on the side of caution.
lfile->SetPreallocationBlockSize(
1.1 * mutable_cf_options.write_buffer_size);
lfile->SetPreallocationBlockSize(1.1 *
mutable_cf_options.write_buffer_size);
unique_ptr<WritableFileWriter> file_writer(
new WritableFileWriter(std::move(lfile), opt_env_opt));
new_log = new log::Writer(std::move(file_writer));
new_log = new log::Writer(std::move(file_writer),
new_log_number,
db_options_.recycle_log_file_num > 0);
}
}
@ -4731,8 +4744,11 @@ Status DB::Open(const DBOptions& db_options, const std::string& dbname,
impl->logfile_number_ = new_log_number;
unique_ptr<WritableFileWriter> file_writer(
new WritableFileWriter(std::move(lfile), opt_env_options));
impl->logs_.emplace_back(new_log_number,
new log::Writer(std::move(file_writer)));
impl->logs_.emplace_back(
new_log_number,
new log::Writer(std::move(file_writer),
new_log_number,
impl->db_options_.recycle_log_file_num > 0));
// set column family handles
for (auto cf : column_families) {

2
db/db_impl.h
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@ -556,6 +556,8 @@ class DBImpl : public DB {
// * whenever there is an error in background flush or compaction
InstrumentedCondVar bg_cv_;
uint64_t logfile_number_;
std::deque<uint64_t>
log_recycle_files; // a list of log files that we can recycle
bool log_dir_synced_;
bool log_empty_;
ColumnFamilyHandleImpl* default_cf_handle_;

4
db/db_test.cc
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@ -5072,7 +5072,9 @@ class RecoveryTestHelper {
ASSERT_OK(db_options.env->NewWritableFile(fname, &file, env_options));
unique_ptr<WritableFileWriter> file_writer(
new WritableFileWriter(std::move(file), env_options));
current_log_writer.reset(new log::Writer(std::move(file_writer)));
current_log_writer.reset(new log::Writer(
std::move(file_writer), current_log_number,
db_options.recycle_log_file_num > 0));
for (int i = 0; i < kKeysPerWALFile; i++) {
std::string key = "key" + ToString(count++);

4
db/db_test_util.cc
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@ -340,6 +340,10 @@ Options DBTestBase::CurrentOptions(
options.row_cache = NewLRUCache(1024 * 1024);
break;
}
case kRecycleLogFiles: {
options.recycle_log_file_num = 2;
break;
}
case kLevelSubcompactions: {
options.max_subcompactions = 4;
break;

7
db/db_test_util.h
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@ -437,9 +437,10 @@ class DBTestBase : public testing::Test {
kFIFOCompaction = 26,
kOptimizeFiltersForHits = 27,
kRowCache = 28,
kLevelSubcompactions = 29,
kUniversalSubcompactions = 30,
kEnd = 29
kRecycleLogFiles = 29,
kLevelSubcompactions = 30,
kUniversalSubcompactions = 31,
kEnd = 30
};
int option_config_;

2
db/flush_job_test.cc
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@ -61,7 +61,7 @@ class FlushJobTest : public testing::Test {
unique_ptr<WritableFileWriter> file_writer(
new WritableFileWriter(std::move(file), EnvOptions()));
{
log::Writer log(std::move(file_writer));
log::Writer log(std::move(file_writer), 0, false);
std::string record;
new_db.EncodeTo(&record);
s = log.AddRecord(record);

14
db/log_format.h
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@ -22,14 +22,24 @@ enum RecordType {
// For fragments
kFirstType = 2,
kMiddleType = 3,
kLastType = 4
kLastType = 4,
// For recycled log files
kRecyclableFullType = 5,
kRecyclableFirstType = 6,
kRecyclableMiddleType = 7,
kRecyclableLastType = 8,
};
static const int kMaxRecordType = kLastType;
static const int kMaxRecordType = kRecyclableLastType;
static const unsigned int kBlockSize = 32768;
// Header is checksum (4 bytes), type (1 byte), length (2 bytes).
static const int kHeaderSize = 4 + 1 + 2;
// Recyclable header is checksum (4 bytes), type (1 byte), log number
// (4 bytes), length (2 bytes).
static const int kRecyclableHeaderSize = 4 + 1 + 4 + 2;
} // namespace log
} // namespace rocksdb

125
db/log_reader.cc
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@ -21,9 +21,12 @@ namespace log {
Reader::Reporter::~Reporter() {
}
Reader::Reader(unique_ptr<SequentialFileReader>&& _file, Reporter* reporter,
bool checksum, uint64_t initial_offset)
: file_(std::move(_file)),
Reader::Reader(std::shared_ptr<Logger> info_log,
unique_ptr<SequentialFileReader>&& _file,
Reporter* reporter, bool checksum, uint64_t initial_offset,
uint64_t log_num)
: info_log_(info_log),
file_(std::move(_file)),
reporter_(reporter),
checksum_(checksum),
backing_store_(new char[kBlockSize]),
@ -33,7 +36,8 @@ Reader::Reader(unique_ptr<SequentialFileReader>&& _file, Reporter* reporter,
eof_offset_(0),
last_record_offset_(0),
end_of_buffer_offset_(0),
initial_offset_(initial_offset) {}
initial_offset_(initial_offset),
log_number_(log_num) {}
Reader::~Reader() {
delete[] backing_store_;
@ -62,8 +66,15 @@ bool Reader::SkipToInitialBlock() {
return true;
}
// For kAbsoluteConsistency, on clean shutdown we don't expect any error
// in the log files. For other modes, we can ignore only incomplete records
// in the last log file, which are presumably due to a write in progress
// during restart (or from log recycling).
//
// TODO krad: Evaluate if we need to move to a more strict mode where we
// restrict the inconsistency to only the last log
bool Reader::ReadRecord(Slice* record, std::string* scratch,
const bool report_eof_inconsistency) {
WALRecoveryMode wal_recovery_mode) {
if (last_record_offset_ < initial_offset_) {
if (!SkipToInitialBlock()) {
return false;
@ -80,10 +91,11 @@ bool Reader::ReadRecord(Slice* record, std::string* scratch,
Slice fragment;
while (true) {
uint64_t physical_record_offset = end_of_buffer_offset_ - buffer_.size();
const unsigned int record_type =
ReadPhysicalRecord(&fragment, report_eof_inconsistency);
size_t drop_size;
const unsigned int record_type = ReadPhysicalRecord(&fragment, &drop_size);
switch (record_type) {
case kFullType:
case kRecyclableFullType:
if (in_fragmented_record && !scratch->empty()) {
// Handle bug in earlier versions of log::Writer where
// it could emit an empty kFirstType record at the tail end
@ -98,6 +110,7 @@ bool Reader::ReadRecord(Slice* record, std::string* scratch,
return true;
case kFirstType:
case kRecyclableFirstType:
if (in_fragmented_record && !scratch->empty()) {
// Handle bug in earlier versions of log::Writer where
// it could emit an empty kFirstType record at the tail end
@ -111,6 +124,7 @@ bool Reader::ReadRecord(Slice* record, std::string* scratch,
break;
case kMiddleType:
case kRecyclableMiddleType:
if (!in_fragmented_record) {
ReportCorruption(fragment.size(),
"missing start of fragmented record(1)");
@ -120,6 +134,7 @@ bool Reader::ReadRecord(Slice* record, std::string* scratch,
break;
case kLastType:
case kRecyclableLastType:
if (!in_fragmented_record) {
ReportCorruption(fragment.size(),
"missing start of fragmented record(2)");
@ -131,9 +146,17 @@ bool Reader::ReadRecord(Slice* record, std::string* scratch,
}
break;
case kBadHeader:
if (wal_recovery_mode == WALRecoveryMode::kAbsoluteConsistency) {
// in clean shutdown we don't expect any error in the log files
ReportCorruption(drop_size, "truncated header");
}
// fall-thru
case kEof:
if (in_fragmented_record) {
if (report_eof_inconsistency) {
if (wal_recovery_mode == WALRecoveryMode::kAbsoluteConsistency) {
// in clean shutdown we don't expect any error in the log files
ReportCorruption(scratch->size(), "error reading trailing data");
}
// This can be caused by the writer dying immediately after
@ -143,6 +166,23 @@ bool Reader::ReadRecord(Slice* record, std::string* scratch,
}
return false;
case kOldRecord:
if (wal_recovery_mode != WALRecoveryMode::kSkipAnyCorruptedRecords) {
// Treat a record from a previous instance of the log as EOF.
if (in_fragmented_record) {
if (wal_recovery_mode == WALRecoveryMode::kAbsoluteConsistency) {
// in clean shutdown we don't expect any error in the log files
ReportCorruption(scratch->size(), "error reading trailing data");
}
// This can be caused by the writer dying immediately after
// writing a physical record but before completing the next; don't
// treat it as a corruption, just ignore the entire logical record.
scratch->clear();
}
return false;
}
// fall-thru
case kBadRecord:
if (in_fragmented_record) {
ReportCorruption(scratch->size(), "error in middle of record");
@ -244,10 +284,7 @@ void Reader::ReportDrop(size_t bytes, const Status& reason) {
}
}
unsigned int Reader::ReadPhysicalRecord(Slice* result,
const bool report_eof_inconsistency) {
while (true) {
if (buffer_.size() < (size_t)kHeaderSize) {
bool Reader::ReadMore(size_t* drop_size, int *error) {
if (!eof_ && !read_error_) {
// Last read was a full read, so this is a trailer to skip
buffer_.clear();
@ -257,23 +294,39 @@ unsigned int Reader::ReadPhysicalRecord(Slice* result,
buffer_.clear();
ReportDrop(kBlockSize, status);
read_error_ = true;
return kEof;
*error = kEof;
return false;
} else if (buffer_.size() < (size_t)kBlockSize) {
eof_ = true;
eof_offset_ = buffer_.size();
}
continue;
return true;
} else {
// Note that if buffer_ is non-empty, we have a truncated header at the
// end of the file, which can be caused by the writer crashing in the
// middle of writing the header. Unless explicitly requested we don't
// considering this an error, just report EOF.
if (buffer_.size() && report_eof_inconsistency) {
ReportCorruption(buffer_.size(), "truncated header");
if (buffer_.size()) {
*drop_size = buffer_.size();
buffer_.clear();
*error = kBadHeader;
return false;
}
buffer_.clear();
return kEof;
*error = kEof;
return false;
}
}
unsigned int Reader::ReadPhysicalRecord(Slice* result, size_t* drop_size) {
while (true) {
// We need at least the minimum header size
if (buffer_.size() < (size_t)kHeaderSize) {
int r;
if (!ReadMore(drop_size, &r)) {
return r;
}
continue;
}
// Parse the header
@ -282,18 +335,34 @@ unsigned int Reader::ReadPhysicalRecord(Slice* result,
const uint32_t b = static_cast<uint32_t>(header[5]) & 0xff;
const unsigned int type = header[6];
const uint32_t length = a | (b << 8);
if (kHeaderSize + length > buffer_.size()) {
size_t drop_size = buffer_.size();
int header_size = kHeaderSize;
if (type >= kRecyclableFullType && type <= kRecyclableLastType) {
header_size = kRecyclableHeaderSize;
// We need enough for the larger header
if (buffer_.size() < (size_t)kRecyclableHeaderSize) {
int r;
if (!ReadMore(drop_size, &r)) {
return r;
}
continue;
}
const uint32_t log_num = DecodeFixed32(header + 7);
if (log_num != log_number_) {
return kOldRecord;
}
}
if (header_size + length > buffer_.size()) {
*drop_size = buffer_.size();
buffer_.clear();
if (!eof_) {
ReportCorruption(drop_size, "bad record length");
ReportCorruption(*drop_size, "bad record length");
return kBadRecord;
}
// If the end of the file has been reached without reading |length| bytes
// of payload, assume the writer died in the middle of writing the record.
// Don't report a corruption unless requested.
if (drop_size && report_eof_inconsistency) {
ReportCorruption(drop_size, "truncated header");
if (*drop_size) {
return kBadHeader;
}
return kEof;
}
@ -311,29 +380,29 @@ unsigned int Reader::ReadPhysicalRecord(Slice* result,
// Check crc
if (checksum_) {
uint32_t expected_crc = crc32c::Unmask(DecodeFixed32(header));
uint32_t actual_crc = crc32c::Value(header + 6, 1 + length);
uint32_t actual_crc = crc32c::Value(header + 6, length + header_size - 6);
if (actual_crc != expected_crc) {
// Drop the rest of the buffer since "length" itself may have
// been corrupted and if we trust it, we could find some
// fragment of a real log record that just happens to look
// like a valid log record.
size_t drop_size = buffer_.size();
*drop_size = buffer_.size();
buffer_.clear();
ReportCorruption(drop_size, "checksum mismatch");
ReportCorruption(*drop_size, "checksum mismatch");
return kBadRecord;
}
}
buffer_.remove_prefix(kHeaderSize + length);
buffer_.remove_prefix(header_size + length);
// Skip physical record that started before initial_offset_
if (end_of_buffer_offset_ - buffer_.size() - kHeaderSize - length <
if (end_of_buffer_offset_ - buffer_.size() - header_size - length <
initial_offset_) {
result->clear();
return kBadRecord;
}
*result = Slice(header + kHeaderSize, length);
*result = Slice(header + header_size, length);
return type;
}
}

27
db/log_reader.h
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@ -14,10 +14,12 @@
#include "db/log_format.h"
#include "rocksdb/slice.h"
#include "rocksdb/status.h"
#include "rocksdb/options.h"
namespace rocksdb {
class SequentialFileReader;
class Logger;
using std::unique_ptr;
namespace log {
@ -51,8 +53,10 @@ class Reader {
//
// The Reader will start reading at the first record located at physical
// position >= initial_offset within the file.
Reader(unique_ptr<SequentialFileReader>&& file, Reporter* reporter,
bool checksum, uint64_t initial_offset);
Reader(std::shared_ptr<Logger> info_log,
unique_ptr<SequentialFileReader>&& file,
Reporter* reporter, bool checksum, uint64_t initial_offset,
uint64_t log_num);
~Reader();
@ -62,7 +66,8 @@ class Reader {
// will only be valid until the next mutating operation on this
// reader or the next mutation to *scratch.
bool ReadRecord(Slice* record, std::string* scratch,
bool report_eof_inconsistency = false);
WALRecoveryMode wal_recovery_mode =
WALRecoveryMode::kTolerateCorruptedTailRecords);
// Returns the physical offset of the last record returned by ReadRecord.
//
@ -84,6 +89,7 @@ class Reader {
SequentialFileReader* file() { return file_.get(); }
private:
std::shared_ptr<Logger> info_log_;
const unique_ptr<SequentialFileReader> file_;
Reporter* const reporter_;
bool const checksum_;
@ -104,6 +110,9 @@ class Reader {
// Offset at which to start looking for the first record to return
uint64_t const initial_offset_;
// which log number this is
uint64_t const log_number_;
// Extend record types with the following special values
enum {
kEof = kMaxRecordType + 1,
@ -112,7 +121,11 @@ class Reader {
// * The record has an invalid CRC (ReadPhysicalRecord reports a drop)
// * The record is a 0-length record (No drop is reported)
// * The record is below constructor's initial_offset (No drop is reported)
kBadRecord = kMaxRecordType + 2
kBadRecord = kMaxRecordType + 2,
// Returned when we fail to read a valid header.
kBadHeader = kMaxRecordType + 3,
// Returned when we read an old record from a previous user of the log.
kOldRecord = kMaxRecordType + 4,
};
// Skips all blocks that are completely before "initial_offset_".
@ -121,8 +134,10 @@ class Reader {
bool SkipToInitialBlock();
// Return type, or one of the preceding special values
unsigned int ReadPhysicalRecord(Slice* result,
bool report_eof_inconsistency = false);
unsigned int ReadPhysicalRecord(Slice* result, size_t* drop_size);
// Read some more
bool ReadMore(size_t* drop_size, int *error);
// Reports dropped bytes to the reporter.
// buffer_ must be updated to remove the dropped bytes prior to invocation.

214
db/log_test.cc
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@ -43,7 +43,7 @@ static std::string RandomSkewedString(int i, Random* rnd) {
return BigString(NumberString(i), rnd->Skewed(17));
}
class LogTest : public testing::Test {
class LogTest : public ::testing::TestWithParam<int> {
private:
class StringSource : public SequentialFile {
public:
@ -153,19 +153,26 @@ class LogTest : public testing::Test {
// Record metadata for testing initial offset functionality
static size_t initial_offset_record_sizes_[];
static uint64_t initial_offset_last_record_offsets_[];
uint64_t initial_offset_last_record_offsets_[4];
public:
LogTest()
: reader_contents_(),
dest_holder_(
test::GetWritableFileWriter(
dest_holder_(test::GetWritableFileWriter(
new test::StringSink(&reader_contents_))),
source_holder_(
test::GetSequentialFileReader(new StringSource(reader_contents_))),
writer_(std::move(dest_holder_)),
reader_(std::move(source_holder_), &report_, true /*checksum*/,
0 /*initial_offset*/) {}
writer_(std::move(dest_holder_), 123, GetParam()),
reader_(NULL, std::move(source_holder_), &report_, true /*checksum*/,
0 /*initial_offset*/, 123) {
int header_size = GetParam() ? kRecyclableHeaderSize : kHeaderSize;
initial_offset_last_record_offsets_[0] = 0;
initial_offset_last_record_offsets_[1] = header_size + 10000;
initial_offset_last_record_offsets_[2] = 2 * (header_size + 10000);
initial_offset_last_record_offsets_[3] = 2 * (header_size + 10000) +
(2 * log::kBlockSize - 1000) +
3 * header_size;
}
void Write(const std::string& msg) {
writer_.AddRecord(Slice(msg));
@ -175,10 +182,11 @@ class LogTest : public testing::Test {
return dest_contents().size();
}
std::string Read(const bool report_eof_inconsistency = false) {
std::string Read(const WALRecoveryMode wal_recovery_mode =
WALRecoveryMode::kTolerateCorruptedTailRecords) {
std::string scratch;
Slice record;
if (reader_.ReadRecord(&record, &scratch, report_eof_inconsistency)) {
if (reader_.ReadRecord(&record, &scratch, wal_recovery_mode)) {
return record.ToString();
} else {
return "EOF";
@ -200,9 +208,11 @@ class LogTest : public testing::Test {
dest->Drop(bytes);
}
void FixChecksum(int header_offset, int len) {
void FixChecksum(int header_offset, int len, bool recyclable) {
// Compute crc of type/len/data
uint32_t crc = crc32c::Value(&dest_contents()[header_offset+6], 1 + len);
int header_size = recyclable ? kRecyclableHeaderSize : kHeaderSize;
uint32_t crc = crc32c::Value(&dest_contents()[header_offset + 6],
header_size - 6 + len);
crc = crc32c::Mask(crc);
EncodeFixed32(&dest_contents()[header_offset], crc);
}
@ -259,8 +269,8 @@ class LogTest : public testing::Test {
unique_ptr<SequentialFileReader> file_reader(
test::GetSequentialFileReader(new StringSource(reader_contents_)));
unique_ptr<Reader> offset_reader(
new Reader(std::move(file_reader), &report_, true /*checksum*/,
WrittenBytes() + offset_past_end));
new Reader(NULL, std::move(file_reader), &report_,
true /*checksum*/, WrittenBytes() + offset_past_end, 123));
Slice record;
std::string scratch;
ASSERT_TRUE(!offset_reader->ReadRecord(&record, &scratch));
@ -271,8 +281,9 @@ class LogTest : public testing::Test {
WriteInitialOffsetLog();
unique_ptr<SequentialFileReader> file_reader(
test::GetSequentialFileReader(new StringSource(reader_contents_)));
unique_ptr<Reader> offset_reader(new Reader(
std::move(file_reader), &report_, true /*checksum*/, initial_offset));
unique_ptr<Reader> offset_reader(
new Reader(NULL, std::move(file_reader), &report_,
true /*checksum*/, initial_offset, 123));
Slice record;
std::string scratch;
ASSERT_TRUE(offset_reader->ReadRecord(&record, &scratch));
@ -291,16 +302,9 @@ size_t LogTest::initial_offset_record_sizes_[] =
2 * log::kBlockSize - 1000, // Span three blocks
1};
uint64_t LogTest::initial_offset_last_record_offsets_[] =
{0,
kHeaderSize + 10000,
2 * (kHeaderSize + 10000),
2 * (kHeaderSize + 10000) +
(2 * log::kBlockSize - 1000) + 3 * kHeaderSize};
TEST_F(LogTest, Empty) { ASSERT_EQ("EOF", Read()); }
TEST_P(LogTest, Empty) { ASSERT_EQ("EOF", Read()); }
TEST_F(LogTest, ReadWrite) {
TEST_P(LogTest, ReadWrite) {
Write("foo");
Write("bar");
Write("");
@ -313,7 +317,7 @@ TEST_F(LogTest, ReadWrite) {
ASSERT_EQ("EOF", Read()); // Make sure reads at eof work
}
TEST_F(LogTest, ManyBlocks) {
TEST_P(LogTest, ManyBlocks) {
for (int i = 0; i < 100000; i++) {
Write(NumberString(i));
}
@ -323,7 +327,7 @@ TEST_F(LogTest, ManyBlocks) {
ASSERT_EQ("EOF", Read());
}
TEST_F(LogTest, Fragmentation) {
TEST_P(LogTest, Fragmentation) {
Write("small");
Write(BigString("medium", 50000));
Write(BigString("large", 100000));
@ -333,11 +337,12 @@ TEST_F(LogTest, Fragmentation) {
ASSERT_EQ("EOF", Read());
}
TEST_F(LogTest, MarginalTrailer) {
TEST_P(LogTest, MarginalTrailer) {
// Make a trailer that is exactly the same length as an empty record.
const int n = kBlockSize - 2*kHeaderSize;
int header_size = GetParam() ? kRecyclableHeaderSize : kHeaderSize;
const int n = kBlockSize - 2 * header_size;
Write(BigString("foo", n));
ASSERT_EQ((unsigned int)(kBlockSize - kHeaderSize), WrittenBytes());
ASSERT_EQ((unsigned int)(kBlockSize - header_size), WrittenBytes());
Write("");
Write("bar");
ASSERT_EQ(BigString("foo", n), Read());
@ -346,11 +351,12 @@ TEST_F(LogTest, MarginalTrailer) {
ASSERT_EQ("EOF", Read());
}
TEST_F(LogTest, MarginalTrailer2) {
TEST_P(LogTest, MarginalTrailer2) {
// Make a trailer that is exactly the same length as an empty record.
const int n = kBlockSize - 2*kHeaderSize;
int header_size = GetParam() ? kRecyclableHeaderSize : kHeaderSize;
const int n = kBlockSize - 2 * header_size;
Write(BigString("foo", n));
ASSERT_EQ((unsigned int)(kBlockSize - kHeaderSize), WrittenBytes());
ASSERT_EQ((unsigned int)(kBlockSize - header_size), WrittenBytes());
Write("bar");
ASSERT_EQ(BigString("foo", n), Read());
ASSERT_EQ("bar", Read());
@ -359,10 +365,11 @@ TEST_F(LogTest, MarginalTrailer2) {
ASSERT_EQ("", ReportMessage());
}
TEST_F(LogTest, ShortTrailer) {
const int n = kBlockSize - 2*kHeaderSize + 4;
TEST_P(LogTest, ShortTrailer) {
int header_size = GetParam() ? kRecyclableHeaderSize : kHeaderSize;
const int n = kBlockSize - 2 * header_size + 4;
Write(BigString("foo", n));
ASSERT_EQ((unsigned int)(kBlockSize - kHeaderSize + 4), WrittenBytes());
ASSERT_EQ((unsigned int)(kBlockSize - header_size + 4), WrittenBytes());
Write("");
Write("bar");
ASSERT_EQ(BigString("foo", n), Read());
@ -371,15 +378,16 @@ TEST_F(LogTest, ShortTrailer) {
ASSERT_EQ("EOF", Read());
}
TEST_F(LogTest, AlignedEof) {
const int n = kBlockSize - 2*kHeaderSize + 4;
TEST_P(LogTest, AlignedEof) {
int header_size = GetParam() ? kRecyclableHeaderSize : kHeaderSize;
const int n = kBlockSize - 2 * header_size + 4;
Write(BigString("foo", n));
ASSERT_EQ((unsigned int)(kBlockSize - kHeaderSize + 4), WrittenBytes());
ASSERT_EQ((unsigned int)(kBlockSize - header_size + 4), WrittenBytes());
ASSERT_EQ(BigString("foo", n), Read());
ASSERT_EQ("EOF", Read());
}
TEST_F(LogTest, RandomRead) {
TEST_P(LogTest, RandomRead) {
const int N = 500;
Random write_rnd(301);
for (int i = 0; i < N; i++) {
@ -394,7 +402,7 @@ TEST_F(LogTest, RandomRead) {
// Tests of all the error paths in log_reader.cc follow:
TEST_F(LogTest, ReadError) {
TEST_P(LogTest, ReadError) {
Write("foo");
ForceError();
ASSERT_EQ("EOF", Read());
@ -402,17 +410,17 @@ TEST_F(LogTest, ReadError) {
ASSERT_EQ("OK", MatchError("read error"));
}
TEST_F(LogTest, BadRecordType) {
TEST_P(LogTest, BadRecordType) {
Write("foo");
// Type is stored in header[6]
IncrementByte(6, 100);
FixChecksum(0, 3);
FixChecksum(0, 3, false);
ASSERT_EQ("EOF", Read());
ASSERT_EQ(3U, DroppedBytes());
ASSERT_EQ("OK", MatchError("unknown record type"));
}
TEST_F(LogTest, TruncatedTrailingRecordIsIgnored) {
TEST_P(LogTest, TruncatedTrailingRecordIsIgnored) {
Write("foo");
ShrinkSize(4); // Drop all payload as well as a header byte
ASSERT_EQ("EOF", Read());
@ -421,17 +429,18 @@ TEST_F(LogTest, TruncatedTrailingRecordIsIgnored) {
ASSERT_EQ("", ReportMessage());
}
TEST_F(LogTest, TruncatedTrailingRecordIsNotIgnored) {
TEST_P(LogTest, TruncatedTrailingRecordIsNotIgnored) {
Write("foo");
ShrinkSize(4); // Drop all payload as well as a header byte
ASSERT_EQ("EOF", Read(/*report_eof_inconsistency*/ true));
ASSERT_EQ("EOF", Read(WALRecoveryMode::kAbsoluteConsistency));
// Truncated last record is ignored, not treated as an error
ASSERT_GT(DroppedBytes(), 0U);
ASSERT_EQ("OK", MatchError("Corruption: truncated header"));
}
TEST_F(LogTest, BadLength) {
const int kPayloadSize = kBlockSize - kHeaderSize;
TEST_P(LogTest, BadLength) {
int header_size = GetParam() ? kRecyclableHeaderSize : kHeaderSize;
const int kPayloadSize = kBlockSize - header_size;
Write(BigString("bar", kPayloadSize));
Write("foo");
// Least significant size byte is stored in header[4].
@ -441,7 +450,7 @@ TEST_F(LogTest, BadLength) {
ASSERT_EQ("OK", MatchError("bad record length"));
}
TEST_F(LogTest, BadLengthAtEndIsIgnored) {
TEST_P(LogTest, BadLengthAtEndIsIgnored) {
Write("foo");
ShrinkSize(1);
ASSERT_EQ("EOF", Read());
@ -449,63 +458,63 @@ TEST_F(LogTest, BadLengthAtEndIsIgnored) {
ASSERT_EQ("", ReportMessage());
}
TEST_F(LogTest, BadLengthAtEndIsNotIgnored) {
TEST_P(LogTest, BadLengthAtEndIsNotIgnored) {
Write("foo");
ShrinkSize(1);
ASSERT_EQ("EOF", Read(/*report_eof_inconsistency=*/true));
ASSERT_EQ("EOF", Read(WALRecoveryMode::kAbsoluteConsistency));
ASSERT_GT(DroppedBytes(), 0U);
ASSERT_EQ("OK", MatchError("Corruption: truncated header"));
}
TEST_F(LogTest, ChecksumMismatch) {
Write("foo");
IncrementByte(0, 10);
TEST_P(LogTest, ChecksumMismatch) {
Write("foooooo");
IncrementByte(0, 14);
ASSERT_EQ("EOF", Read());
ASSERT_EQ(10U, DroppedBytes());
ASSERT_EQ(14U + 4 * !!GetParam(), DroppedBytes());
ASSERT_EQ("OK", MatchError("checksum mismatch"));
}
TEST_F(LogTest, UnexpectedMiddleType) {
TEST_P(LogTest, UnexpectedMiddleType) {
Write("foo");
SetByte(6, kMiddleType);
FixChecksum(0, 3);
SetByte(6, GetParam() ? kRecyclableMiddleType : kMiddleType);
FixChecksum(0, 3, !!GetParam());
ASSERT_EQ("EOF", Read());
ASSERT_EQ(3U, DroppedBytes());
ASSERT_EQ("OK", MatchError("missing start"));
}
TEST_F(LogTest, UnexpectedLastType) {
TEST_P(LogTest, UnexpectedLastType) {
Write("foo");
SetByte(6, kLastType);
FixChecksum(0, 3);
SetByte(6, GetParam() ? kRecyclableLastType : kLastType);
FixChecksum(0, 3, !!GetParam());
ASSERT_EQ("EOF", Read());
ASSERT_EQ(3U, DroppedBytes());
ASSERT_EQ("OK", MatchError("missing start"));
}
TEST_F(LogTest, UnexpectedFullType) {
TEST_P(LogTest, UnexpectedFullType) {
Write("foo");
Write("bar");
SetByte(6, kFirstType);
FixChecksum(0, 3);
SetByte(6, GetParam() ? kRecyclableFirstType : kFirstType);
FixChecksum(0, 3, !!GetParam());
ASSERT_EQ("bar", Read());
ASSERT_EQ("EOF", Read());
ASSERT_EQ(3U, DroppedBytes());
ASSERT_EQ("OK", MatchError("partial record without end"));
}
TEST_F(LogTest, UnexpectedFirstType) {
TEST_P(LogTest, UnexpectedFirstType) {
Write("foo");
Write(BigString("bar", 100000));
SetByte(6, kFirstType);
FixChecksum(0, 3);
SetByte(6, GetParam() ? kRecyclableFirstType : kFirstType);
FixChecksum(0, 3, !!GetParam());
ASSERT_EQ(BigString("bar", 100000), Read());
ASSERT_EQ("EOF", Read());
ASSERT_EQ(3U, DroppedBytes());
ASSERT_EQ("OK", MatchError("partial record without end"));
}
TEST_F(LogTest, MissingLastIsIgnored) {
TEST_P(LogTest, MissingLastIsIgnored) {
Write(BigString("bar", kBlockSize));
// Remove the LAST block, including header.
ShrinkSize(14);
@ -514,16 +523,16 @@ TEST_F(LogTest, MissingLastIsIgnored) {
ASSERT_EQ(0U, DroppedBytes());
}
TEST_F(LogTest, MissingLastIsNotIgnored) {
TEST_P(LogTest, MissingLastIsNotIgnored) {
Write(BigString("bar", kBlockSize));
// Remove the LAST block, including header.
ShrinkSize(14);
ASSERT_EQ("EOF", Read(/*report_eof_inconsistency=*/true));
ASSERT_EQ("EOF", Read(WALRecoveryMode::kAbsoluteConsistency));
ASSERT_GT(DroppedBytes(), 0U);
ASSERT_EQ("OK", MatchError("Corruption: error reading trailing data"));
}
TEST_F(LogTest, PartialLastIsIgnored) {
TEST_P(LogTest, PartialLastIsIgnored) {
Write(BigString("bar", kBlockSize));
// Cause a bad record length in the LAST block.
ShrinkSize(1);
@ -532,18 +541,18 @@ TEST_F(LogTest, PartialLastIsIgnored) {
ASSERT_EQ(0U, DroppedBytes());
}
TEST_F(LogTest, PartialLastIsNotIgnored) {
TEST_P(LogTest, PartialLastIsNotIgnored) {
Write(BigString("bar", kBlockSize));
// Cause a bad record length in the LAST block.
ShrinkSize(1);
ASSERT_EQ("EOF", Read(/*report_eof_inconsistency=*/true));
ASSERT_EQ("EOF", Read(WALRecoveryMode::kAbsoluteConsistency));
ASSERT_GT(DroppedBytes(), 0U);
ASSERT_EQ("OK", MatchError(
"Corruption: truncated headerCorruption: "
"error reading trailing data"));
}
TEST_F(LogTest, ErrorJoinsRecords) {
TEST_P(LogTest, ErrorJoinsRecords) {
// Consider two fragmented records:
// first(R1) last(R1) first(R2) last(R2)
// where the middle two fragments disappear. We do not want
@ -566,46 +575,60 @@ TEST_F(LogTest, ErrorJoinsRecords) {
ASSERT_GE(dropped, 2 * kBlockSize);
}
TEST_F(LogTest, ReadStart) { CheckInitialOffsetRecord(0, 0); }
TEST_P(LogTest, ReadStart) { CheckInitialOffsetRecord(0, 0); }
TEST_F(LogTest, ReadSecondOneOff) { CheckInitialOffsetRecord(1, 1); }
TEST_P(LogTest, ReadSecondOneOff) { CheckInitialOffsetRecord(1, 1); }
TEST_F(LogTest, ReadSecondTenThousand) { CheckInitialOffsetRecord(10000, 1); }
TEST_P(LogTest, ReadSecondTenThousand) { CheckInitialOffsetRecord(10000, 1); }
TEST_F(LogTest, ReadSecondStart) { CheckInitialOffsetRecord(10007, 1); }
TEST_P(LogTest, ReadSecondStart) {
int header_size = GetParam() ? kRecyclableHeaderSize : kHeaderSize;
CheckInitialOffsetRecord(10000 + header_size, 1);
}
TEST_F(LogTest, ReadThirdOneOff) { CheckInitialOffsetRecord(10008, 2); }
TEST_P(LogTest, ReadThirdOneOff) {
int header_size = GetParam() ? kRecyclableHeaderSize : kHeaderSize;
CheckInitialOffsetRecord(10000 + header_size + 1, 2);
}
TEST_F(LogTest, ReadThirdStart) { CheckInitialOffsetRecord(20014, 2); }
TEST_P(LogTest, ReadThirdStart) {
int header_size = GetParam() ? kRecyclableHeaderSize : kHeaderSize;
CheckInitialOffsetRecord(20000 + 2 * header_size, 2);
}
TEST_F(LogTest, ReadFourthOneOff) { CheckInitialOffsetRecord(20015, 3); }
TEST_P(LogTest, ReadFourthOneOff) {
int header_size = GetParam() ? kRecyclableHeaderSize : kHeaderSize;
CheckInitialOffsetRecord(20000 + 2 * header_size + 1, 3);
}
TEST_F(LogTest, ReadFourthFirstBlockTrailer) {
TEST_P(LogTest, ReadFourthFirstBlockTrailer) {
CheckInitialOffsetRecord(log::kBlockSize - 4, 3);
}
TEST_F(LogTest, ReadFourthMiddleBlock) {
TEST_P(LogTest, ReadFourthMiddleBlock) {
CheckInitialOffsetRecord(log::kBlockSize + 1, 3);
}
TEST_F(LogTest, ReadFourthLastBlock) {
TEST_P(LogTest, ReadFourthLastBlock) {
CheckInitialOffsetRecord(2 * log::kBlockSize + 1, 3);
}
TEST_F(LogTest, ReadFourthStart) {
TEST_P(LogTest, ReadFourthStart) {
int header_size = GetParam() ? kRecyclableHeaderSize : kHeaderSize;
CheckInitialOffsetRecord(
2 * (kHeaderSize + 1000) + (2 * log::kBlockSize - 1000) + 3 * kHeaderSize,
2 * (header_size + 1000) + (2 * log::kBlockSize - 1000) + 3 * header_size,
3);
}
TEST_F(LogTest, ReadEnd) { CheckOffsetPastEndReturnsNoRecords(0); }
TEST_P(LogTest, ReadEnd) { CheckOffsetPastEndReturnsNoRecords(0); }
TEST_F(LogTest, ReadPastEnd) { CheckOffsetPastEndReturnsNoRecords(5); }
TEST_P(LogTest, ReadPastEnd) { CheckOffsetPastEndReturnsNoRecords(5); }
TEST_F(LogTest, ClearEofSingleBlock) {
TEST_P(LogTest, ClearEofSingleBlock) {
Write("foo");
Write("bar");
ForceEOF(3 + kHeaderSize + 2);
int header_size = GetParam() ? kRecyclableHeaderSize : kHeaderSize;
ForceEOF(3 + header_size + 2);
ASSERT_EQ("foo", Read());
UnmarkEOF();
ASSERT_EQ("bar", Read());
@ -617,12 +640,13 @@ TEST_F(LogTest, ClearEofSingleBlock) {
ASSERT_TRUE(IsEOF());
}
TEST_F(LogTest, ClearEofMultiBlock) {
TEST_P(LogTest, ClearEofMultiBlock) {
size_t num_full_blocks = 5;
size_t n = (kBlockSize - kHeaderSize) * num_full_blocks + 25;
int header_size = GetParam() ? kRecyclableHeaderSize : kHeaderSize;
size_t n = (kBlockSize - header_size) * num_full_blocks + 25;
Write(BigString("foo", n));
Write(BigString("bar", n));
ForceEOF(n + num_full_blocks * kHeaderSize + 10);
ForceEOF(n + num_full_blocks * header_size + header_size + 3);
ASSERT_EQ(BigString("foo", n), Read());
ASSERT_TRUE(IsEOF());
UnmarkEOF();
@ -634,7 +658,7 @@ TEST_F(LogTest, ClearEofMultiBlock) {
ASSERT_TRUE(IsEOF());
}
TEST_F(LogTest, ClearEofError) {
TEST_P(LogTest, ClearEofError) {
// If an error occurs during Read() in UnmarkEOF(), the records contained
// in the buffer should be returned on subsequent calls of ReadRecord()
// until no more full records are left, whereafter ReadRecord() should return
@ -652,7 +676,7 @@ TEST_F(LogTest, ClearEofError) {
ASSERT_EQ("EOF", Read());
}
TEST_F(LogTest, ClearEofError2) {
TEST_P(LogTest, ClearEofError2) {
Write("foo");
Write("bar");
UnmarkEOF();
@ -666,6 +690,8 @@ TEST_F(LogTest, ClearEofError2) {
ASSERT_EQ("OK", MatchError("read error"));
}
INSTANTIATE_TEST_CASE_P(bool, LogTest, ::testing::Values(0, 2));
} // namespace log
} // namespace rocksdb

66
db/log_writer.cc
Unescape View File

@ -18,8 +18,12 @@
namespace rocksdb {
namespace log {
Writer::Writer(unique_ptr<WritableFileWriter>&& dest)
: dest_(std::move(dest)), block_offset_(0) {
Writer::Writer(unique_ptr<WritableFileWriter>&& dest,
uint64_t log_number, bool recycle_log_files)
: dest_(std::move(dest)),
block_offset_(0),
log_number_(log_number),
recycle_log_files_(recycle_log_files) {
for (int i = 0; i <= kMaxRecordType; i++) {
char t = static_cast<char>(i);
type_crc_[i] = crc32c::Value(&t, 1);
@ -33,6 +37,10 @@ Status Writer::AddRecord(const Slice& slice) {
const char* ptr = slice.data();
size_t left = slice.size();
// Header size varies depending on whether we are recycling or not.
const int header_size =
recycle_log_files_ ? kRecyclableHeaderSize : kHeaderSize;
// Fragment the record if necessary and emit it. Note that if slice
// is empty, we still want to iterate once to emit a single
// zero-length record
@ -41,32 +49,34 @@ Status Writer::AddRecord(const Slice& slice) {
do {
const int leftover = kBlockSize - block_offset_;
assert(leftover >= 0);
if (leftover < kHeaderSize) {
if (leftover < header_size) {
// Switch to a new block
if (leftover > 0) {
// Fill the trailer (literal below relies on kHeaderSize being 7)
assert(kHeaderSize == 7);
dest_->Append(Slice("\x00\x00\x00\x00\x00\x00", leftover));
// Fill the trailer (literal below relies on kHeaderSize and
// kRecyclableHeaderSize being <= 11)
assert(header_size <= 11);
dest_->Append(
Slice("\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", leftover));
}
block_offset_ = 0;
}
// Invariant: we never leave < kHeaderSize bytes in a block.
assert(static_cast<int>(kBlockSize) - block_offset_ >= kHeaderSize);
// Invariant: we never leave < header_size bytes in a block.
assert(static_cast<int>(kBlockSize) - block_offset_ >= header_size);
const size_t avail = kBlockSize - block_offset_ - kHeaderSize;
const size_t avail = kBlockSize - block_offset_ - header_size;
const size_t fragment_length = (left < avail) ? left : avail;
RecordType type;
const bool end = (left == fragment_length);
if (begin && end) {
type = kFullType;
type = recycle_log_files_ ? kRecyclableFullType : kFullType;
} else if (begin) {
type = kFirstType;
type = recycle_log_files_ ? kRecyclableFirstType : kFirstType;
} else if (end) {
type = kLastType;
type = recycle_log_files_ ? kRecyclableLastType : kLastType;
} else {
type = kMiddleType;
type = recycle_log_files_ ? kRecyclableMiddleType : kMiddleType;
}
s = EmitPhysicalRecord(type, ptr, fragment_length);
@ -79,28 +89,48 @@ Status Writer::AddRecord(const Slice& slice) {
Status Writer::EmitPhysicalRecord(RecordType t, const char* ptr, size_t n) {
assert(n <= 0xffff); // Must fit in two bytes
assert(block_offset_ + kHeaderSize + n <= kBlockSize);
size_t header_size;
char buf[kRecyclableHeaderSize];
// Format the header
char buf[kHeaderSize];
buf[4] = static_cast<char>(n & 0xff);
buf[5] = static_cast<char>(n >> 8);
buf[6] = static_cast<char>(t);
uint32_t crc = type_crc_[t];
if (t < kRecyclableFullType) {
// Legacy record format
assert(block_offset_ + kHeaderSize + n <= kBlockSize);
header_size = kHeaderSize;
} else {
// Recyclable record format
assert(block_offset_ + kRecyclableHeaderSize + n <= kBlockSize);
header_size = kRecyclableHeaderSize;
// Only encode low 32-bits of the 64-bit log number. This means
// we will fail to detect an old record if we recycled a log from
// ~4 billion logs ago, but that is effectively impossible, and
// even if it were we'dbe far more likely to see a false positive
// on the 32-bit CRC.
EncodeFixed32(buf + 7, static_cast<uint32_t>(log_number_));
crc = crc32c::Extend(crc, buf + 7, 4);
}
// Compute the crc of the record type and the payload.
uint32_t crc = crc32c::Extend(type_crc_[t], ptr, n);
crc = crc32c::Extend(crc, ptr, n);
crc = crc32c::Mask(crc); // Adjust for storage
EncodeFixed32(buf, crc);
// Write the header and the payload
Status s = dest_->Append(Slice(buf, kHeaderSize));
Status s = dest_->Append(Slice(buf, header_size));
if (s.ok()) {
s = dest_->Append(Slice(ptr, n));
if (s.ok()) {
s = dest_->Flush();
}
}
block_offset_ += kHeaderSize + n;
block_offset_ += header_size + n;
return s;
}

16
db/log_writer.h
Unescape View File

@ -43,7 +43,7 @@ namespace log {
* Data is written out in kBlockSize chunks. If next record does not fit
* into the space left, the leftover space will be padded with \0.
*
* Record format:
* Legacy record format:
*
* +---------+-----------+-----------+--- ... ---+
* |CRC (4B) | Size (2B) | Type (1B) | Payload |
@ -57,13 +57,23 @@ namespace log {
* blocks that are larger than kBlockSize
* Payload = Byte stream as long as specified by the payload size
*
* Recyclable record format:
*
* +---------+-----------+-----------+----------------+--- ... ---+
* |CRC (4B) | Size (2B) | Type (1B) | Log number (4B)| Payload |
* +---------+-----------+-----------+----------------+--- ... ---+
*
* Same as above, with the addition of
* Log number = 32bit log file number, so that we can distinguish between
* records written by the most recent log writer vs a previous one.
*/
class Writer {
public:
// Create a writer that will append data to "*dest".
// "*dest" must be initially empty.
// "*dest" must remain live while this Writer is in use.
explicit Writer(unique_ptr<WritableFileWriter>&& dest);
explicit Writer(unique_ptr<WritableFileWriter>&& dest,
uint64_t log_number, bool recycle_log_files);
~Writer();
Status AddRecord(const Slice& slice);
@ -74,6 +84,8 @@ class Writer {
private:
unique_ptr<WritableFileWriter> dest_;
int block_offset_; // Current offset in block
uint64_t log_number_;
bool recycle_log_files_;
// crc32c values for all supported record types. These are
// pre-computed to reduce the overhead of computing the crc of the

6
db/repair.cc
Unescape View File

@ -249,8 +249,8 @@ class Repairer {
// corruptions cause entire commits to be skipped instead of
// propagating bad information (like overly large sequence
// numbers).
log::Reader reader(std::move(lfile_reader), &reporter,
true /*enable checksum*/, 0 /*initial_offset*/);
log::Reader reader(options_.info_log, std::move(lfile_reader), &reporter,
true /*enable checksum*/, 0 /*initial_offset*/, log);
// Read all the records and add to a memtable
std::string scratch;
@ -413,7 +413,7 @@ class Repairer {
{
unique_ptr<WritableFileWriter> file_writer(
new WritableFileWriter(std::move(file), env_options));
log::Writer log(std::move(file_writer));
log::Writer log(std::move(file_writer), 0, false);
std::string record;
edit_->EncodeTo(&record);
status = log.AddRecord(record);

6
db/transaction_log_impl.cc
Unescape View File

@ -262,8 +262,10 @@ Status TransactionLogIteratorImpl::OpenLogReader(const LogFile* logFile) {
return s;
}
assert(file);
currentLogReader_.reset(new log::Reader(std::move(file), &reporter_,
read_options_.verify_checksums_, 0));
currentLogReader_.reset(new log::Reader(options_->info_log,
std::move(file), &reporter_,
read_options_.verify_checksums_, 0,
logFile->LogNumber()));
return Status::OK();
}
} // namespace rocksdb

17
db/version_set.cc
Unescape View File

@ -2126,7 +2126,7 @@ Status VersionSet::LogAndApply(ColumnFamilyData* column_family_data,
unique_ptr<WritableFileWriter> file_writer(
new WritableFileWriter(std::move(descriptor_file), opt_env_opts));
descriptor_log_.reset(new log::Writer(std::move(file_writer)));
descriptor_log_.reset(new log::Writer(std::move(file_writer), 0, false));
s = WriteSnapshot(descriptor_log_.get());
}
}
@ -2390,8 +2390,8 @@ Status VersionSet::Recover(
{
VersionSet::LogReporter reporter;
reporter.status = &s;
log::Reader reader(std::move(manifest_file_reader), &reporter,
true /*checksum*/, 0 /*initial_offset*/);
log::Reader reader(NULL, std::move(manifest_file_reader), &reporter,
true /*checksum*/, 0 /*initial_offset*/, 0);
Slice record;
std::string scratch;
while (reader.ReadRecord(&record, &scratch) && s.ok()) {
@ -2643,8 +2643,8 @@ Status VersionSet::ListColumnFamilies(std::vector<std::string>* column_families,
column_family_names.insert({0, kDefaultColumnFamilyName});
VersionSet::LogReporter reporter;
reporter.status = &s;
log::Reader reader(std::move(file_reader), &reporter, true /*checksum*/,
0 /*initial_offset*/);
log::Reader reader(NULL, std::move(file_reader), &reporter, true /*checksum*/,
0 /*initial_offset*/, 0);
Slice record;
std::string scratch;
while (reader.ReadRecord(&record, &scratch) && s.ok()) {
@ -2801,8 +2801,8 @@ Status VersionSet::DumpManifest(Options& options, std::string& dscname,
{
VersionSet::LogReporter reporter;
reporter.status = &s;
log::Reader reader(std::move(file_reader), &reporter, true /*checksum*/,
0 /*initial_offset*/);
log::Reader reader(NULL, std::move(file_reader), &reporter,
true /*checksum*/, 0 /*initial_offset*/, 0);
Slice record;
std::string scratch;
while (reader.ReadRecord(&record, &scratch) && s.ok()) {
@ -3054,7 +3054,8 @@ bool VersionSet::ManifestContains(uint64_t manifest_file_num,
}
file_reader.reset(new SequentialFileReader(std::move(file)));
}
log::Reader reader(std::move(file_reader), nullptr, true /*checksum*/, 0);
log::Reader reader(NULL, std::move(file_reader), nullptr,
true /*checksum*/, 0, 0);
Slice r;
std::string scratch;
bool result = false;

4
db/wal_manager.cc
Unescape View File

@ -448,8 +448,8 @@ Status WalManager::ReadFirstLine(const std::string& fname,
reporter.fname = fname.c_str();
reporter.status = &status;
reporter.ignore_error = !db_options_.paranoid_checks;
log::Reader reader(std::move(file_reader), &reporter, true /*checksum*/,
0 /*initial_offset*/);
log::Reader reader(db_options_.info_log, std::move(file_reader), &reporter,
true /*checksum*/, 0 /*initial_offset*/, *sequence);
std::string scratch;
Slice record;

5
db/wal_manager_test.cc
Unescape View File

@ -77,7 +77,7 @@ class WalManagerTest : public testing::Test {
ASSERT_OK(env_->NewWritableFile(fname, &file, env_options_));
unique_ptr<WritableFileWriter> file_writer(
new WritableFileWriter(std::move(file), env_options_));
current_log_writer_.reset(new log::Writer(std::move(file_writer)));
current_log_writer_.reset(new log::Writer(std::move(file_writer), 0, false));
}
void CreateArchiveLogs(int num_logs, int entries_per_log) {
@ -127,7 +127,8 @@ TEST_F(WalManagerTest, ReadFirstRecordCache) {
unique_ptr<WritableFileWriter> file_writer(
new WritableFileWriter(std::move(file), EnvOptions()));
log::Writer writer(std::move(file_writer));
log::Writer writer(std::move(file_writer), 1,
db_options_.recycle_log_file_num > 0);
WriteBatch batch;
batch.Put("foo", "bar");
WriteBatchInternal::SetSequence(&batch, 10);

2
include/rocksdb/c.h
Unescape View File

@ -572,6 +572,8 @@ extern ROCKSDB_LIBRARY_API void rocksdb_options_set_log_file_time_to_roll(
rocksdb_options_t*, size_t);
extern ROCKSDB_LIBRARY_API void rocksdb_options_set_keep_log_file_num(
rocksdb_options_t*, size_t);
extern ROCKSDB_LIBRARY_API void rocksdb_options_set_recycle_log_file_num(
rocksdb_options_t*, size_t);
extern ROCKSDB_LIBRARY_API void rocksdb_options_set_soft_rate_limit(
rocksdb_options_t*, double);
extern ROCKSDB_LIBRARY_API void rocksdb_options_set_hard_rate_limit(

6
include/rocksdb/env.h
Unescape View File

@ -139,6 +139,12 @@ class Env {
unique_ptr<WritableFile>* result,
const EnvOptions& options) = 0;
// Reuse an existing file by renaming it and opening it as writable.
virtual Status ReuseWritableFile(const std::string& fname,
const std::string& old_fname,
unique_ptr<WritableFile>* result,
const EnvOptions& options);
// Create an object that represents a directory. Will fail if directory
// doesn't exist. If the directory exists, it will open the directory
// and create a new Directory object.

10
include/rocksdb/options.h
Unescape View File

@ -957,6 +957,16 @@ struct DBOptions {
// Default: 1000
size_t keep_log_file_num;
// Recycle log files.
// If non-zero, we will reuse previously written log files for new
// logs, overwriting the old data. The value indicates how many
// such files we will keep around at any point in time for later
// use. This is more efficient because the blocks are already
// allocated and fdatasync does not need to update the inode after
// each write.
// Default: 0
size_t recycle_log_file_num;
// manifest file is rolled over on reaching this limit.
// The older manifest file be deleted.
// The default value is MAX_INT so that roll-over does not take place.

53
java/rocksjni/options.cc
Unescape View File

@ -576,6 +576,33 @@ void Java_org_rocksdb_Options_setKeepLogFileNum(
}
}
/*
* Class: org_rocksdb_Options
* Method: recycleLogFiles
* Signature: (J)J
*/
jlong Java_org_rocksdb_Options_recycleLogFileNum(JNIEnv* env, jobject jobj,
jlong jhandle) {
return reinterpret_cast<rocksdb::Options*>(jhandle)->recycle_log_file_num;
}
/*
* Class: org_rocksdb_Options
* Method: setRecycleLogFiles
* Signature: (JJ)V
*/
void Java_org_rocksdb_Options_setRecycleLogFiles(JNIEnv* env, jobject jobj,
jlong jhandle,
jlong recycle_log_file_num) {
rocksdb::Status s = rocksdb::check_if_jlong_fits_size_t(recycle_log_file_num);
if (s.ok()) {
reinterpret_cast<rocksdb::Options*>(jhandle)->recycle_log_file_num =
recycle_log_file_num;
} else {
rocksdb::IllegalArgumentExceptionJni::ThrowNew(env, s);
}
}
/*
* Class: org_rocksdb_Options
* Method: maxManifestFileSize
@ -3533,6 +3560,32 @@ jlong Java_org_rocksdb_DBOptions_keepLogFileNum(
return reinterpret_cast<rocksdb::DBOptions*>(jhandle)->keep_log_file_num;
}
/*
* Class: org_rocksdb_DBOptions
* Method: setRecycleLogFiles
* Signature: (JJ)V
*/
void Java_org_rocksdb_DBOptions_setRecycleLogFileNum(
JNIEnv* env, jobject jobj, jlong jhandle, jlong recycle_log_file_num) {
rocksdb::Status s = rocksdb::check_if_jlong_fits_size_t(recycle_log_file_num);
if (s.ok()) {
reinterpret_cast<rocksdb::DBOptions*>(jhandle)->recycle_log_file_num =
recycle_log_file_num;
} else {
rocksdb::IllegalArgumentExceptionJni::ThrowNew(env, s);
}
}
/*
* Class: org_rocksdb_DBOptions
* Method: recycleLogFiles
* Signature: (J)J
*/
jlong Java_org_rocksdb_DBOptions_recycleLogFileNum(JNIEnv* env, jobject jobj,
jlong jhandle) {
return reinterpret_cast<rocksdb::DBOptions*>(jhandle)->recycle_log_file_num;
}
/*
* Class: org_rocksdb_DBOptions
* Method: setMaxManifestFileSize

16
tools/ldb_cmd.cc
Unescape View File

@ -1438,7 +1438,21 @@ void DumpWalFile(std::string wal_file, bool print_header, bool print_values,
}
} else {
StdErrReporter reporter;
log::Reader reader(move(wal_file_reader), &reporter, true, 0);
uint64_t log_number;
FileType type;
// we need the log number, but ParseFilename expects dbname/NNN.log.
string sanitized = wal_file;
size_t lastslash = sanitized.rfind('/');
if (lastslash != std::string::npos)
sanitized = sanitized.substr(lastslash + 1);
if (!ParseFileName(sanitized, &log_number, &type)) {
// bogus input, carry on as best we can
log_number = 0;
}
DBOptions db_options;
log::Reader reader(db_options.info_log, move(wal_file_reader), &reporter,
true, 0, log_number);
string scratch;
WriteBatch batch;
Slice record;

11
util/env.cc
Unescape View File

@ -27,6 +27,17 @@ uint64_t Env::GetThreadID() const {
return hasher(std::this_thread::get_id());
}
Status Env::ReuseWritableFile(const std::string& fname,
const std::string& old_fname,
unique_ptr<WritableFile>* result,
const EnvOptions& options) {
Status s = RenameFile(old_fname, fname);
if (!s.ok()) {
return s;
}
return NewWritableFile(fname, result, options);
}
SequentialFile::~SequentialFile() {
}

44
util/env_posix.cc
Unescape View File

@ -205,6 +205,50 @@ class PosixEnv : public Env {
return s;
}
virtual Status ReuseWritableFile(const std::string& fname,
const std::string& old_fname,
unique_ptr<WritableFile>* result,
const EnvOptions& options) override {
result->reset();
Status s;
int fd = -1;
do {
IOSTATS_TIMER_GUARD(open_nanos);
fd = open(old_fname.c_str(), O_RDWR, 0644);
} while (fd < 0 && errno == EINTR);
if (fd < 0) {
s = IOError(fname, errno);
} else {
SetFD_CLOEXEC(fd, &options);
// rename into place
if (rename(old_fname.c_str(), fname.c_str()) != 0) {
Status r = IOError(old_fname, errno);
close(fd);
return r;
}
if (options.use_mmap_writes) {
if (!checkedDiskForMmap_) {
// this will be executed once in the program's lifetime.
// do not use mmapWrite on non ext-3/xfs/tmpfs systems.
if (!SupportsFastAllocate(fname)) {
forceMmapOff = true;
}
checkedDiskForMmap_ = true;
}
}
if (options.use_mmap_writes && !forceMmapOff) {
result->reset(new PosixMmapFile(fname, fd, page_size_, options));
} else {
// disable mmap writes
EnvOptions no_mmap_writes_options = options;
no_mmap_writes_options.use_mmap_writes = false;
result->reset(new PosixWritableFile(fname, fd, no_mmap_writes_options));
}
}
return s;
}
virtual Status NewDirectory(const std::string& name,
unique_ptr<Directory>* result) override {
result->reset();

4
util/options.cc
Unescape View File

@ -231,6 +231,7 @@ DBOptions::DBOptions()
max_log_file_size(0),
log_file_time_to_roll(0),
keep_log_file_num(1000),
recycle_log_file_num(0),
max_manifest_file_size(std::numeric_limits<uint64_t>::max()),
table_cache_numshardbits(4),
WAL_ttl_seconds(0),
@ -285,6 +286,7 @@ DBOptions::DBOptions(const Options& options)
max_log_file_size(options.max_log_file_size),
log_file_time_to_roll(options.log_file_time_to_roll),
keep_log_file_num(options.keep_log_file_num),
recycle_log_file_num(options.recycle_log_file_num),
max_manifest_file_size(options.max_manifest_file_size),
table_cache_numshardbits(options.table_cache_numshardbits),
WAL_ttl_seconds(options.WAL_ttl_seconds),
@ -338,6 +340,8 @@ void DBOptions::Dump(Logger* log) const {
log_file_time_to_roll);
Header(log, " Options.keep_log_file_num: %" ROCKSDB_PRIszt,
keep_log_file_num);
Header(log, " Options.recycle_log_file_num: %" ROCKSDB_PRIszt,
recycle_log_file_num);
Header(log, " Options.allow_os_buffer: %d", allow_os_buffer);
Header(log, " Options.allow_mmap_reads: %d", allow_mmap_reads);
Header(log, " Options.allow_fallocate: %d", allow_fallocate);

3
util/options_helper.h
Unescape View File

@ -207,6 +207,9 @@ static std::unordered_map<std::string, OptionTypeInfo> db_options_type_info = {
{"keep_log_file_num",
{offsetof(struct DBOptions, keep_log_file_num), OptionType::kSizeT,
OptionVerificationType::kNormal}},
{"recycle_log_file_num",
{offsetof(struct DBOptions, recycle_log_file_num), OptionType::kSizeT,
OptionVerificationType::kNormal}},
{"log_file_time_to_roll",
{offsetof(struct DBOptions, log_file_time_to_roll), OptionType::kSizeT,
OptionVerificationType::kNormal}},

6
util/options_test.cc
Unescape View File

@ -323,6 +323,7 @@ TEST_F(OptionsTest, GetOptionsFromMapTest) {
{"max_log_file_size", "37"},
{"log_file_time_to_roll", "38"},
{"keep_log_file_num", "39"},
{"recycle_log_file_num", "5"},
{"max_manifest_file_size", "40"},
{"table_cache_numshardbits", "41"},
{"WAL_ttl_seconds", "43"},
@ -339,7 +340,8 @@ TEST_F(OptionsTest, GetOptionsFromMapTest) {
{"new_table_reader_for_compaction_inputs", "true"},
{"compaction_readahead_size", "100"},
{"bytes_per_sync", "47"},
{"wal_bytes_per_sync", "48"}, };
{"wal_bytes_per_sync", "48"},
};
ColumnFamilyOptions base_cf_opt;
ColumnFamilyOptions new_cf_opt;
@ -431,6 +433,7 @@ TEST_F(OptionsTest, GetOptionsFromMapTest) {
ASSERT_EQ(new_db_opt.max_log_file_size, 37U);
ASSERT_EQ(new_db_opt.log_file_time_to_roll, 38U);
ASSERT_EQ(new_db_opt.keep_log_file_num, 39U);
ASSERT_EQ(new_db_opt.recycle_log_file_num, 5U);
ASSERT_EQ(new_db_opt.max_manifest_file_size, static_cast<uint64_t>(40));
ASSERT_EQ(new_db_opt.table_cache_numshardbits, 41);
ASSERT_EQ(new_db_opt.WAL_ttl_seconds, static_cast<uint64_t>(43));
@ -692,6 +695,7 @@ void RandomInitDBOptions(DBOptions* db_opt, Random* rnd) {
db_opt->skip_stats_update_on_db_open = rnd->Uniform(2);
db_opt->use_adaptive_mutex = rnd->Uniform(2);
db_opt->use_fsync = rnd->Uniform(2);
db_opt->recycle_log_file_num = rnd->Uniform(2);
// int options
db_opt->max_background_compactions = rnd->Uniform(100);

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