3ebb7ba7b9
Summary: Changing blob file format and some code cleanup around the change. The change with blob log format are: * Remove timestamp field in blob file header, blob file footer and blob records. The field is not being use and often confuse with expiration field. * Blob file header now come with column family id, which always equal to default column family id. It leaves room for future support of column family. * Compression field in blob file header now is a standalone byte (instead of compact encode with flags field) * Blob file footer now come with its own crc. * Key length now being uint64_t instead of uint32_t * Blob CRC now checksum both key and value (instead of value only). * Some reordering of the fields. The list of cleanups: * Better inline comments in blob_log_format.h * rename ttlrange_t and snrange_t to ExpirationRange and SequenceRange respectively. * simplify blob_db::Reader * Move crc checking logic to inside blob_log_format.cc Closes https://github.com/facebook/rocksdb/pull/3081 Differential Revision: D6171304 Pulled By: yiwu-arbug fbshipit-source-id: e4373e0d39264441b7e2fbd0caba93ddd99ea2af
122 lines
3.4 KiB
C++
122 lines
3.4 KiB
C++
// 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).
|
|
#ifndef ROCKSDB_LITE
|
|
|
|
#include "utilities/blob_db/blob_log_writer.h"
|
|
|
|
#include <cstdint>
|
|
#include <string>
|
|
#include "rocksdb/env.h"
|
|
#include "util/coding.h"
|
|
#include "util/file_reader_writer.h"
|
|
#include "utilities/blob_db/blob_log_format.h"
|
|
|
|
namespace rocksdb {
|
|
namespace blob_db {
|
|
|
|
Writer::Writer(unique_ptr<WritableFileWriter>&& dest, uint64_t log_number,
|
|
uint64_t bpsync, bool use_fs, uint64_t boffset)
|
|
: dest_(std::move(dest)),
|
|
log_number_(log_number),
|
|
block_offset_(boffset),
|
|
bytes_per_sync_(bpsync),
|
|
next_sync_offset_(0),
|
|
use_fsync_(use_fs),
|
|
last_elem_type_(kEtNone) {}
|
|
|
|
void Writer::Sync() { dest_->Sync(use_fsync_); }
|
|
|
|
Status Writer::WriteHeader(BlobLogHeader& header) {
|
|
assert(block_offset_ == 0);
|
|
assert(last_elem_type_ == kEtNone);
|
|
std::string str;
|
|
header.EncodeTo(&str);
|
|
|
|
Status s = dest_->Append(Slice(str));
|
|
if (s.ok()) {
|
|
block_offset_ += str.size();
|
|
s = dest_->Flush();
|
|
}
|
|
last_elem_type_ = kEtFileHdr;
|
|
return s;
|
|
}
|
|
|
|
Status Writer::AppendFooter(BlobLogFooter& footer) {
|
|
assert(block_offset_ != 0);
|
|
assert(last_elem_type_ == kEtFileHdr || last_elem_type_ == kEtRecord);
|
|
|
|
std::string str;
|
|
footer.EncodeTo(&str);
|
|
|
|
Status s = dest_->Append(Slice(str));
|
|
if (s.ok()) {
|
|
block_offset_ += str.size();
|
|
s = dest_->Close();
|
|
dest_.reset();
|
|
}
|
|
|
|
last_elem_type_ = kEtFileFooter;
|
|
return s;
|
|
}
|
|
|
|
Status Writer::AddRecord(const Slice& key, const Slice& val,
|
|
uint64_t expiration, uint64_t* key_offset,
|
|
uint64_t* blob_offset) {
|
|
assert(block_offset_ != 0);
|
|
assert(last_elem_type_ == kEtFileHdr || last_elem_type_ == kEtRecord);
|
|
|
|
std::string buf;
|
|
ConstructBlobHeader(&buf, key, val, expiration);
|
|
|
|
Status s = EmitPhysicalRecord(buf, key, val, key_offset, blob_offset);
|
|
return s;
|
|
}
|
|
|
|
Status Writer::AddRecord(const Slice& key, const Slice& val,
|
|
uint64_t* key_offset, uint64_t* blob_offset) {
|
|
assert(block_offset_ != 0);
|
|
assert(last_elem_type_ == kEtFileHdr || last_elem_type_ == kEtRecord);
|
|
|
|
std::string buf;
|
|
ConstructBlobHeader(&buf, key, val, 0);
|
|
|
|
Status s = EmitPhysicalRecord(buf, key, val, key_offset, blob_offset);
|
|
return s;
|
|
}
|
|
|
|
void Writer::ConstructBlobHeader(std::string* buf, const Slice& key,
|
|
const Slice& val, uint64_t expiration) {
|
|
BlobLogRecord record;
|
|
record.key = key;
|
|
record.value = val;
|
|
record.expiration = expiration;
|
|
record.EncodeHeaderTo(buf);
|
|
}
|
|
|
|
Status Writer::EmitPhysicalRecord(const std::string& headerbuf,
|
|
const Slice& key, const Slice& val,
|
|
uint64_t* key_offset, uint64_t* blob_offset) {
|
|
Status s = dest_->Append(Slice(headerbuf));
|
|
if (s.ok()) {
|
|
s = dest_->Append(key);
|
|
}
|
|
if (s.ok()) {
|
|
s = dest_->Append(val);
|
|
}
|
|
if (s.ok()) {
|
|
s = dest_->Flush();
|
|
}
|
|
|
|
*key_offset = block_offset_ + BlobLogRecord::kHeaderSize;
|
|
*blob_offset = *key_offset + key.size();
|
|
block_offset_ = *blob_offset + val.size();
|
|
last_elem_type_ = kEtRecord;
|
|
return s;
|
|
}
|
|
|
|
} // namespace blob_db
|
|
} // namespace rocksdb
|
|
#endif // ROCKSDB_LITE
|