9e82540901
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.
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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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#ifndef ROCKSDB_LITE
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#include "utilities/blob_db/blob_log_writer.h"
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#include <cstdint>
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#include <string>
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#include "rocksdb/env.h"
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#include "util/coding.h"
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#include "util/file_reader_writer.h"
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#include "utilities/blob_db/blob_log_format.h"
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namespace rocksdb {
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namespace blob_db {
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Writer::Writer(unique_ptr<WritableFileWriter>&& dest, uint64_t log_number,
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uint64_t bpsync, bool use_fs, uint64_t boffset)
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: dest_(std::move(dest)),
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log_number_(log_number),
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block_offset_(boffset),
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bytes_per_sync_(bpsync),
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next_sync_offset_(0),
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use_fsync_(use_fs),
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last_elem_type_(kEtNone) {}
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void Writer::Sync() { dest_->Sync(use_fsync_); }
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Status Writer::WriteHeader(BlobLogHeader& header) {
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assert(block_offset_ == 0);
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assert(last_elem_type_ == kEtNone);
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std::string str;
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header.EncodeTo(&str);
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Status s = dest_->Append(Slice(str));
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if (s.ok()) {
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block_offset_ += str.size();
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s = dest_->Flush();
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}
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last_elem_type_ = kEtFileHdr;
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return s;
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}
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Status Writer::AppendFooter(BlobLogFooter& footer) {
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assert(block_offset_ != 0);
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assert(last_elem_type_ == kEtFileHdr || last_elem_type_ == kEtRecord);
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std::string str;
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footer.EncodeTo(&str);
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Status s = dest_->Append(Slice(str));
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if (s.ok()) {
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block_offset_ += str.size();
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s = dest_->Close();
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dest_.reset();
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}
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last_elem_type_ = kEtFileFooter;
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return s;
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}
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Status Writer::AddRecord(const Slice& key, const Slice& val,
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uint64_t expiration, uint64_t* key_offset,
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uint64_t* blob_offset) {
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assert(block_offset_ != 0);
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assert(last_elem_type_ == kEtFileHdr || last_elem_type_ == kEtRecord);
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std::string buf;
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ConstructBlobHeader(&buf, key, val, expiration);
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Status s = EmitPhysicalRecord(buf, key, val, key_offset, blob_offset);
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return s;
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}
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Status Writer::AddRecord(const Slice& key, const Slice& val,
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uint64_t* key_offset, uint64_t* blob_offset) {
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assert(block_offset_ != 0);
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assert(last_elem_type_ == kEtFileHdr || last_elem_type_ == kEtRecord);
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std::string buf;
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ConstructBlobHeader(&buf, key, val, 0);
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Status s = EmitPhysicalRecord(buf, key, val, key_offset, blob_offset);
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return s;
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}
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void Writer::ConstructBlobHeader(std::string* buf, const Slice& key,
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const Slice& val, uint64_t expiration) {
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BlobLogRecord record;
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record.key = key;
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record.value = val;
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record.expiration = expiration;
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record.EncodeHeaderTo(buf);
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}
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Status Writer::EmitPhysicalRecord(const std::string& headerbuf,
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const Slice& key, const Slice& val,
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uint64_t* key_offset, uint64_t* blob_offset) {
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Status s = dest_->Append(Slice(headerbuf));
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if (s.ok()) {
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s = dest_->Append(key);
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}
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if (s.ok()) {
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s = dest_->Append(val);
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}
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if (s.ok()) {
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s = dest_->Flush();
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}
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*key_offset = block_offset_ + BlobLogRecord::kHeaderSize;
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*blob_offset = *key_offset + key.size();
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block_offset_ = *blob_offset + val.size();
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last_elem_type_ = kEtRecord;
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return s;
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}
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} // namespace blob_db
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} // namespace rocksdb
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#endif // ROCKSDB_LITE
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