250a51a3f9
Summary: Refactor BlobDB open logic. List of changes: Major: * On reopen, mark blob files found as immutable, do not use them for writing new keys. * Not to scan the whole file to find file footer. Instead just seek to the end of the file and try to read footer. Minor: * Move most of the real logic from blob_db.cc to blob_db_impl.cc. * Not to hold shared_ptr of event listeners in global maps in blob_db.cc * Some changes to BlobFile interface. * Improve logging and error handling. Closes https://github.com/facebook/rocksdb/pull/3246 Differential Revision: D6526147 Pulled By: yiwu-arbug fbshipit-source-id: 9dc4cdd63359a2f9b696af817086949da8d06952
140 lines
4.0 KiB
C++
140 lines
4.0 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 "monitoring/statistics.h"
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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 "util/stop_watch.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, Env* env,
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Statistics* statistics, uint64_t log_number, uint64_t bpsync,
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bool use_fs, uint64_t boffset)
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: dest_(std::move(dest)),
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env_(env),
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statistics_(statistics),
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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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Status Writer::Sync() {
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StopWatch sync_sw(env_, statistics_, BLOB_DB_BLOB_FILE_SYNC_MICROS);
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Status s = dest_->Sync(use_fsync_);
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RecordTick(statistics_, BLOB_DB_BLOB_FILE_SYNCED);
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return s;
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}
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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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RecordTick(statistics_, BLOB_DB_BLOB_FILE_BYTES_WRITTEN,
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BlobLogHeader::kSize);
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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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RecordTick(statistics_, BLOB_DB_BLOB_FILE_BYTES_WRITTEN,
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BlobLogFooter::kSize);
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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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StopWatch write_sw(env_, statistics_, BLOB_DB_BLOB_FILE_WRITE_MICROS);
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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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RecordTick(statistics_, BLOB_DB_BLOB_FILE_BYTES_WRITTEN,
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BlobLogRecord::kHeaderSize + key.size() + val.size());
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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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