ac1d69da31
(Based on a suggestion by cmumford.) "open" benchmark on my workstation speeds up significantly since we can now avoid three fdatasync calls and a compaction per open: Before: ~80000 microseconds After: ~130 microseconds Details: (1) Added Options::reuse_logs (currently defaults to false) to control new behavior. The intention is to change the default to true after some baking. (2) Added Env::NewAppendableFile() whose default implementation returns a not-supported error. (3) VersionSet::Recovery attempts to reuse the MANIFEST from which it is recovering. (4) DBImpl recovery attempts to reuse the last log file and memtable. (5) db_test.cc now tests a new configuration that sets reuse_logs to true. (6) fault_injection_test also tests a reuse_logs==true config. (7) Added a new recovery_test.
101 lines
2.2 KiB
C++
101 lines
2.2 KiB
C++
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "leveldb/env.h"
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namespace leveldb {
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Env::~Env() {
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}
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Status Env::NewAppendableFile(const std::string& fname, WritableFile** result) {
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return Status::NotSupported("NewAppendableFile", fname);
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}
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SequentialFile::~SequentialFile() {
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}
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RandomAccessFile::~RandomAccessFile() {
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}
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WritableFile::~WritableFile() {
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}
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Logger::~Logger() {
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}
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FileLock::~FileLock() {
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}
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void Log(Logger* info_log, const char* format, ...) {
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if (info_log != NULL) {
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va_list ap;
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va_start(ap, format);
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info_log->Logv(format, ap);
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va_end(ap);
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}
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}
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static Status DoWriteStringToFile(Env* env, const Slice& data,
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const std::string& fname,
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bool should_sync) {
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WritableFile* file;
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Status s = env->NewWritableFile(fname, &file);
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if (!s.ok()) {
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return s;
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}
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s = file->Append(data);
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if (s.ok() && should_sync) {
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s = file->Sync();
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}
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if (s.ok()) {
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s = file->Close();
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}
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delete file; // Will auto-close if we did not close above
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if (!s.ok()) {
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env->DeleteFile(fname);
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}
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return s;
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}
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Status WriteStringToFile(Env* env, const Slice& data,
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const std::string& fname) {
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return DoWriteStringToFile(env, data, fname, false);
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}
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Status WriteStringToFileSync(Env* env, const Slice& data,
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const std::string& fname) {
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return DoWriteStringToFile(env, data, fname, true);
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}
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Status ReadFileToString(Env* env, const std::string& fname, std::string* data) {
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data->clear();
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SequentialFile* file;
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Status s = env->NewSequentialFile(fname, &file);
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if (!s.ok()) {
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return s;
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}
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static const int kBufferSize = 8192;
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char* space = new char[kBufferSize];
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while (true) {
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Slice fragment;
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s = file->Read(kBufferSize, &fragment, space);
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if (!s.ok()) {
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break;
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}
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data->append(fragment.data(), fragment.size());
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if (fragment.empty()) {
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break;
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}
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}
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delete[] space;
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delete file;
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return s;
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}
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EnvWrapper::~EnvWrapper() {
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}
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} // namespace leveldb
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