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rocksdb/env/env.cc

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26 KiB

// 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).
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include "rocksdb/env.h"
#include <thread>
#include "env/composite_env_wrapper.h"
#include "logging/env_logger.h"
#include "memory/arena.h"
#include "options/db_options.h"
#include "port/port.h"
#include "rocksdb/options.h"
#include "rocksdb/system_clock.h"
#include "rocksdb/utilities/object_registry.h"
#include "util/autovector.h"
namespace ROCKSDB_NAMESPACE {
namespace {
class LegacySystemClock : public SystemClock {
private:
Env* env_;
public:
explicit LegacySystemClock(Env* env) : env_(env) {}
const char* Name() const override { return "Legacy System Clock"; }
// Returns the number of micro-seconds since some fixed point in time.
// It is often used as system time such as in GenericRateLimiter
// and other places so a port needs to return system time in order to work.
uint64_t NowMicros() override { return env_->NowMicros(); }
// Returns the number of nano-seconds since some fixed point in time. Only
// useful for computing deltas of time in one run.
// Default implementation simply relies on NowMicros.
// In platform-specific implementations, NowNanos() should return time points
// that are MONOTONIC.
uint64_t NowNanos() override { return env_->NowNanos(); }
uint64_t CPUMicros() override { return CPUNanos() / 1000; }
uint64_t CPUNanos() override { return env_->NowCPUNanos(); }
// Sleep/delay the thread for the prescribed number of micro-seconds.
void SleepForMicroseconds(int micros) override {
env_->SleepForMicroseconds(micros);
}
// Get the number of seconds since the Epoch, 1970-01-01 00:00:00 (UTC).
// Only overwrites *unix_time on success.
Status GetCurrentTime(int64_t* unix_time) override {
return env_->GetCurrentTime(unix_time);
}
// Converts seconds-since-Jan-01-1970 to a printable string
std::string TimeToString(uint64_t time) override {
return env_->TimeToString(time);
}
};
class LegacyFileSystemWrapper : public FileSystem {
public:
// Initialize an EnvWrapper that delegates all calls to *t
explicit LegacyFileSystemWrapper(Env* t) : target_(t) {}
~LegacyFileSystemWrapper() override {}
const char* Name() const override { return "Legacy File System"; }
// Return the target to which this Env forwards all calls
Env* target() const { return target_; }
// The following text is boilerplate that forwards all methods to target()
IOStatus NewSequentialFile(const std::string& f, const FileOptions& file_opts,
std::unique_ptr<FSSequentialFile>* r,
IODebugContext* /*dbg*/) override {
std::unique_ptr<SequentialFile> file;
Status s = target_->NewSequentialFile(f, &file, file_opts);
if (s.ok()) {
r->reset(new LegacySequentialFileWrapper(std::move(file)));
}
return status_to_io_status(std::move(s));
}
IOStatus NewRandomAccessFile(const std::string& f,
const FileOptions& file_opts,
std::unique_ptr<FSRandomAccessFile>* r,
IODebugContext* /*dbg*/) override {
std::unique_ptr<RandomAccessFile> file;
Status s = target_->NewRandomAccessFile(f, &file, file_opts);
if (s.ok()) {
r->reset(new LegacyRandomAccessFileWrapper(std::move(file)));
}
return status_to_io_status(std::move(s));
}
IOStatus NewWritableFile(const std::string& f, const FileOptions& file_opts,
std::unique_ptr<FSWritableFile>* r,
IODebugContext* /*dbg*/) override {
std::unique_ptr<WritableFile> file;
Status s = target_->NewWritableFile(f, &file, file_opts);
if (s.ok()) {
r->reset(new LegacyWritableFileWrapper(std::move(file)));
}
return status_to_io_status(std::move(s));
}
IOStatus ReopenWritableFile(const std::string& fname,
const FileOptions& file_opts,
std::unique_ptr<FSWritableFile>* result,
IODebugContext* /*dbg*/) override {
std::unique_ptr<WritableFile> file;
Status s = target_->ReopenWritableFile(fname, &file, file_opts);
if (s.ok()) {
result->reset(new LegacyWritableFileWrapper(std::move(file)));
}
return status_to_io_status(std::move(s));
}
IOStatus ReuseWritableFile(const std::string& fname,
const std::string& old_fname,
const FileOptions& file_opts,
std::unique_ptr<FSWritableFile>* r,
IODebugContext* /*dbg*/) override {
std::unique_ptr<WritableFile> file;
Status s = target_->ReuseWritableFile(fname, old_fname, &file, file_opts);
if (s.ok()) {
r->reset(new LegacyWritableFileWrapper(std::move(file)));
}
return status_to_io_status(std::move(s));
}
IOStatus NewRandomRWFile(const std::string& fname,
const FileOptions& file_opts,
std::unique_ptr<FSRandomRWFile>* result,
IODebugContext* /*dbg*/) override {
std::unique_ptr<RandomRWFile> file;
Status s = target_->NewRandomRWFile(fname, &file, file_opts);
if (s.ok()) {
result->reset(new LegacyRandomRWFileWrapper(std::move(file)));
}
return status_to_io_status(std::move(s));
}
IOStatus NewMemoryMappedFileBuffer(
const std::string& fname,
std::unique_ptr<MemoryMappedFileBuffer>* result) override {
return status_to_io_status(
target_->NewMemoryMappedFileBuffer(fname, result));
}
IOStatus NewDirectory(const std::string& name, const IOOptions& /*io_opts*/,
std::unique_ptr<FSDirectory>* result,
IODebugContext* /*dbg*/) override {
std::unique_ptr<Directory> dir;
Status s = target_->NewDirectory(name, &dir);
if (s.ok()) {
result->reset(new LegacyDirectoryWrapper(std::move(dir)));
}
return status_to_io_status(std::move(s));
}
IOStatus FileExists(const std::string& f, const IOOptions& /*io_opts*/,
IODebugContext* /*dbg*/) override {
return status_to_io_status(target_->FileExists(f));
}
IOStatus GetChildren(const std::string& dir, const IOOptions& /*io_opts*/,
std::vector<std::string>* r,
IODebugContext* /*dbg*/) override {
return status_to_io_status(target_->GetChildren(dir, r));
}
IOStatus GetChildrenFileAttributes(const std::string& dir,
const IOOptions& /*options*/,
std::vector<FileAttributes>* result,
IODebugContext* /*dbg*/) override {
return status_to_io_status(target_->GetChildrenFileAttributes(dir, result));
}
IOStatus DeleteFile(const std::string& f, const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
return status_to_io_status(target_->DeleteFile(f));
}
IOStatus Truncate(const std::string& fname, size_t size,
const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
return status_to_io_status(target_->Truncate(fname, size));
}
IOStatus CreateDir(const std::string& d, const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
return status_to_io_status(target_->CreateDir(d));
}
IOStatus CreateDirIfMissing(const std::string& d,
const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
return status_to_io_status(target_->CreateDirIfMissing(d));
}
IOStatus DeleteDir(const std::string& d, const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
return status_to_io_status(target_->DeleteDir(d));
}
IOStatus GetFileSize(const std::string& f, const IOOptions& /*options*/,
uint64_t* s, IODebugContext* /*dbg*/) override {
return status_to_io_status(target_->GetFileSize(f, s));
}
IOStatus GetFileModificationTime(const std::string& fname,
const IOOptions& /*options*/,
uint64_t* file_mtime,
IODebugContext* /*dbg*/) override {
return status_to_io_status(
target_->GetFileModificationTime(fname, file_mtime));
}
IOStatus GetAbsolutePath(const std::string& db_path,
const IOOptions& /*options*/,
std::string* output_path,
IODebugContext* /*dbg*/) override {
return status_to_io_status(target_->GetAbsolutePath(db_path, output_path));
}
IOStatus RenameFile(const std::string& s, const std::string& t,
const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
return status_to_io_status(target_->RenameFile(s, t));
}
IOStatus LinkFile(const std::string& s, const std::string& t,
const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
return status_to_io_status(target_->LinkFile(s, t));
}
IOStatus NumFileLinks(const std::string& fname, const IOOptions& /*options*/,
uint64_t* count, IODebugContext* /*dbg*/) override {
return status_to_io_status(target_->NumFileLinks(fname, count));
}
IOStatus AreFilesSame(const std::string& first, const std::string& second,
const IOOptions& /*options*/, bool* res,
IODebugContext* /*dbg*/) override {
return status_to_io_status(target_->AreFilesSame(first, second, res));
}
IOStatus LockFile(const std::string& f, const IOOptions& /*options*/,
FileLock** l, IODebugContext* /*dbg*/) override {
return status_to_io_status(target_->LockFile(f, l));
}
IOStatus UnlockFile(FileLock* l, const IOOptions& /*options*/,
IODebugContext* /*dbg*/) override {
return status_to_io_status(target_->UnlockFile(l));
}
IOStatus GetTestDirectory(const IOOptions& /*options*/, std::string* path,
IODebugContext* /*dbg*/) override {
return status_to_io_status(target_->GetTestDirectory(path));
}
IOStatus NewLogger(const std::string& fname, const IOOptions& /*options*/,
std::shared_ptr<Logger>* result,
IODebugContext* /*dbg*/) override {
return status_to_io_status(target_->NewLogger(fname, result));
}
void SanitizeFileOptions(FileOptions* opts) const override {
target_->SanitizeEnvOptions(opts);
}
FileOptions OptimizeForLogRead(
const FileOptions& file_options) const override {
return target_->OptimizeForLogRead(file_options);
}
FileOptions OptimizeForManifestRead(
const FileOptions& file_options) const override {
return target_->OptimizeForManifestRead(file_options);
}
FileOptions OptimizeForLogWrite(const FileOptions& file_options,
const DBOptions& db_options) const override {
return target_->OptimizeForLogWrite(file_options, db_options);
}
FileOptions OptimizeForManifestWrite(
const FileOptions& file_options) const override {
return target_->OptimizeForManifestWrite(file_options);
}
FileOptions OptimizeForCompactionTableWrite(
const FileOptions& file_options,
const ImmutableDBOptions& immutable_ops) const override {
return target_->OptimizeForCompactionTableWrite(file_options,
immutable_ops);
}
FileOptions OptimizeForCompactionTableRead(
const FileOptions& file_options,
const ImmutableDBOptions& db_options) const override {
return target_->OptimizeForCompactionTableRead(file_options, db_options);
}
#ifdef GetFreeSpace
#undef GetFreeSpace
#endif
IOStatus GetFreeSpace(const std::string& path, const IOOptions& /*options*/,
uint64_t* diskfree, IODebugContext* /*dbg*/) override {
return status_to_io_status(target_->GetFreeSpace(path, diskfree));
}
IOStatus IsDirectory(const std::string& path, const IOOptions& /*options*/,
bool* is_dir, IODebugContext* /*dbg*/) override {
return status_to_io_status(target_->IsDirectory(path, is_dir));
}
private:
Env* target_;
};
} // end anonymous namespace
Env::Env() : thread_status_updater_(nullptr) {
file_system_ = std::make_shared<LegacyFileSystemWrapper>(this);
system_clock_ = std::make_shared<LegacySystemClock>(this);
}
Env::Env(const std::shared_ptr<FileSystem>& fs)
: thread_status_updater_(nullptr), file_system_(fs) {
system_clock_ = std::make_shared<LegacySystemClock>(this);
}
Env::Env(const std::shared_ptr<FileSystem>& fs,
const std::shared_ptr<SystemClock>& clock)
: thread_status_updater_(nullptr), file_system_(fs), system_clock_(clock) {}
Env::~Env() {
}
Status Env::NewLogger(const std::string& fname,
std::shared_ptr<Logger>* result) {
return NewEnvLogger(fname, this, result);
}
Status Env::LoadEnv(const std::string& value, Env** result) {
Env* env = *result;
Status s;
#ifndef ROCKSDB_LITE
s = ObjectRegistry::NewInstance()->NewStaticObject<Env>(value, &env);
#else
s = Status::NotSupported("Cannot load environment in LITE mode", value);
#endif
if (s.ok()) {
*result = env;
}
return s;
}
Status Env::LoadEnv(const std::string& value, Env** result,
std::shared_ptr<Env>* guard) {
assert(result);
Status s;
#ifndef ROCKSDB_LITE
Env* env = nullptr;
std::unique_ptr<Env> uniq_guard;
std::string err_msg;
assert(guard != nullptr);
env = ObjectRegistry::NewInstance()->NewObject<Env>(value, &uniq_guard,
&err_msg);
if (!env) {
s = Status::NotFound(std::string("Cannot load ") + Env::Type() + ": " +
value);
env = Env::Default();
}
if (s.ok() && uniq_guard) {
guard->reset(uniq_guard.release());
*result = guard->get();
} else {
*result = env;
}
#else
(void)result;
(void)guard;
s = Status::NotSupported("Cannot load environment in LITE mode", value);
#endif
return s;
}
std::string Env::PriorityToString(Env::Priority priority) {
switch (priority) {
case Env::Priority::BOTTOM:
return "Bottom";
case Env::Priority::LOW:
return "Low";
case Env::Priority::HIGH:
return "High";
case Env::Priority::USER:
return "User";
case Env::Priority::TOTAL:
assert(false);
}
return "Invalid";
}
uint64_t Env::GetThreadID() const {
std::hash<std::thread::id> hasher;
return hasher(std::this_thread::get_id());
}
Status Env::ReuseWritableFile(const std::string& fname,
const std::string& old_fname,
std::unique_ptr<WritableFile>* result,
const EnvOptions& options) {
Status s = RenameFile(old_fname, fname);
if (!s.ok()) {
return s;
}
return NewWritableFile(fname, result, options);
}
Status Env::GetChildrenFileAttributes(const std::string& dir,
std::vector<FileAttributes>* result) {
assert(result != nullptr);
std::vector<std::string> child_fnames;
Status s = GetChildren(dir, &child_fnames);
if (!s.ok()) {
return s;
}
result->resize(child_fnames.size());
size_t result_size = 0;
for (size_t i = 0; i < child_fnames.size(); ++i) {
const std::string path = dir + "/" + child_fnames[i];
if (!(s = GetFileSize(path, &(*result)[result_size].size_bytes)).ok()) {
if (FileExists(path).IsNotFound()) {
// The file may have been deleted since we listed the directory
continue;
}
return s;
}
(*result)[result_size].name = std::move(child_fnames[i]);
result_size++;
}
result->resize(result_size);
return Status::OK();
}
Status Env::GetHostNameString(std::string* result) {
std::array<char, kMaxHostNameLen> hostname_buf;
Status s = GetHostName(hostname_buf.data(), hostname_buf.size());
if (s.ok()) {
hostname_buf[hostname_buf.size() - 1] = '\0';
result->assign(hostname_buf.data());
}
return s;
}
SequentialFile::~SequentialFile() {
}
RandomAccessFile::~RandomAccessFile() {
}
WritableFile::~WritableFile() {
}
MemoryMappedFileBuffer::~MemoryMappedFileBuffer() {}
Logger::~Logger() {}
Status Logger::Close() {
if (!closed_) {
closed_ = true;
return CloseImpl();
} else {
return Status::OK();
}
}
Status Logger::CloseImpl() { return Status::NotSupported(); }
FileLock::~FileLock() {
}
void LogFlush(Logger *info_log) {
if (info_log) {
info_log->Flush();
}
}
static void Logv(Logger *info_log, const char* format, va_list ap) {
if (info_log && info_log->GetInfoLogLevel() <= InfoLogLevel::INFO_LEVEL) {
info_log->Logv(InfoLogLevel::INFO_LEVEL, format, ap);
}
}
void Log(Logger* info_log, const char* format, ...) {
va_list ap;
va_start(ap, format);
Logv(info_log, format, ap);
va_end(ap);
}
void Logger::Logv(const InfoLogLevel log_level, const char* format, va_list ap) {
static const char* kInfoLogLevelNames[5] = { "DEBUG", "INFO", "WARN",
"ERROR", "FATAL" };
if (log_level < log_level_) {
return;
}
if (log_level == InfoLogLevel::INFO_LEVEL) {
// Doesn't print log level if it is INFO level.
// This is to avoid unexpected performance regression after we add
// the feature of log level. All the logs before we add the feature
// are INFO level. We don't want to add extra costs to those existing
// logging.
Logv(format, ap);
} else if (log_level == InfoLogLevel::HEADER_LEVEL) {
LogHeader(format, ap);
} else {
char new_format[500];
snprintf(new_format, sizeof(new_format) - 1, "[%s] %s",
kInfoLogLevelNames[log_level], format);
Logv(new_format, ap);
}
if (log_level >= InfoLogLevel::WARN_LEVEL &&
log_level != InfoLogLevel::HEADER_LEVEL) {
// Log messages with severity of warning or higher should be rare and are
// sometimes followed by an unclean crash. We want to be sure important
// messages are not lost in an application buffer when that happens.
Flush();
}
}
static void Logv(const InfoLogLevel log_level, Logger *info_log, const char *format, va_list ap) {
if (info_log && info_log->GetInfoLogLevel() <= log_level) {
if (log_level == InfoLogLevel::HEADER_LEVEL) {
info_log->LogHeader(format, ap);
} else {
info_log->Logv(log_level, format, ap);
}
}
}
void Log(const InfoLogLevel log_level, Logger* info_log, const char* format,
...) {
va_list ap;
va_start(ap, format);
Logv(log_level, info_log, format, ap);
va_end(ap);
}
static void Headerv(Logger *info_log, const char *format, va_list ap) {
if (info_log) {
info_log->LogHeader(format, ap);
}
}
void Header(Logger* info_log, const char* format, ...) {
va_list ap;
va_start(ap, format);
Headerv(info_log, format, ap);
va_end(ap);
}
static void Debugv(Logger* info_log, const char* format, va_list ap) {
if (info_log && info_log->GetInfoLogLevel() <= InfoLogLevel::DEBUG_LEVEL) {
info_log->Logv(InfoLogLevel::DEBUG_LEVEL, format, ap);
}
}
void Debug(Logger* info_log, const char* format, ...) {
va_list ap;
va_start(ap, format);
Debugv(info_log, format, ap);
va_end(ap);
}
static void Infov(Logger* info_log, const char* format, va_list ap) {
if (info_log && info_log->GetInfoLogLevel() <= InfoLogLevel::INFO_LEVEL) {
info_log->Logv(InfoLogLevel::INFO_LEVEL, format, ap);
}
}
void Info(Logger* info_log, const char* format, ...) {
va_list ap;
va_start(ap, format);
Infov(info_log, format, ap);
va_end(ap);
}
static void Warnv(Logger* info_log, const char* format, va_list ap) {
if (info_log && info_log->GetInfoLogLevel() <= InfoLogLevel::WARN_LEVEL) {
info_log->Logv(InfoLogLevel::WARN_LEVEL, format, ap);
}
}
void Warn(Logger* info_log, const char* format, ...) {
va_list ap;
va_start(ap, format);
Warnv(info_log, format, ap);
va_end(ap);
}
static void Errorv(Logger* info_log, const char* format, va_list ap) {
if (info_log && info_log->GetInfoLogLevel() <= InfoLogLevel::ERROR_LEVEL) {
info_log->Logv(InfoLogLevel::ERROR_LEVEL, format, ap);
}
}
void Error(Logger* info_log, const char* format, ...) {
va_list ap;
va_start(ap, format);
Errorv(info_log, format, ap);
va_end(ap);
}
static void Fatalv(Logger* info_log, const char* format, va_list ap) {
if (info_log && info_log->GetInfoLogLevel() <= InfoLogLevel::FATAL_LEVEL) {
info_log->Logv(InfoLogLevel::FATAL_LEVEL, format, ap);
}
}
void Fatal(Logger* info_log, const char* format, ...) {
va_list ap;
va_start(ap, format);
Fatalv(info_log, format, ap);
va_end(ap);
}
void LogFlush(const std::shared_ptr<Logger>& info_log) {
LogFlush(info_log.get());
}
void Log(const InfoLogLevel log_level, const std::shared_ptr<Logger>& info_log,
const char* format, ...) {
va_list ap;
va_start(ap, format);
Logv(log_level, info_log.get(), format, ap);
va_end(ap);
}
void Header(const std::shared_ptr<Logger>& info_log, const char* format, ...) {
va_list ap;
va_start(ap, format);
Headerv(info_log.get(), format, ap);
va_end(ap);
}
void Debug(const std::shared_ptr<Logger>& info_log, const char* format, ...) {
va_list ap;
va_start(ap, format);
Debugv(info_log.get(), format, ap);
va_end(ap);
}
void Info(const std::shared_ptr<Logger>& info_log, const char* format, ...) {
va_list ap;
va_start(ap, format);
Infov(info_log.get(), format, ap);
va_end(ap);
}
void Warn(const std::shared_ptr<Logger>& info_log, const char* format, ...) {
va_list ap;
va_start(ap, format);
Warnv(info_log.get(), format, ap);
va_end(ap);
}
void Error(const std::shared_ptr<Logger>& info_log, const char* format, ...) {
va_list ap;
va_start(ap, format);
Errorv(info_log.get(), format, ap);
va_end(ap);
}
void Fatal(const std::shared_ptr<Logger>& info_log, const char* format, ...) {
va_list ap;
va_start(ap, format);
Fatalv(info_log.get(), format, ap);
va_end(ap);
}
void Log(const std::shared_ptr<Logger>& info_log, const char* format, ...) {
va_list ap;
va_start(ap, format);
Logv(info_log.get(), format, ap);
va_end(ap);
}
Status WriteStringToFile(Env* env, const Slice& data, const std::string& fname,
bool should_sync) {
const auto& fs = env->GetFileSystem();
return WriteStringToFile(fs.get(), data, fname, should_sync);
}
Status ReadFileToString(Env* env, const std::string& fname, std::string* data) {
const auto& fs = env->GetFileSystem();
return ReadFileToString(fs.get(), fname, data);
}
EnvWrapper::~EnvWrapper() {
}
namespace { // anonymous namespace
void AssignEnvOptions(EnvOptions* env_options, const DBOptions& options) {
env_options->use_mmap_reads = options.allow_mmap_reads;
env_options->use_mmap_writes = options.allow_mmap_writes;
env_options->use_direct_reads = options.use_direct_reads;
env_options->set_fd_cloexec = options.is_fd_close_on_exec;
env_options->bytes_per_sync = options.bytes_per_sync;
env_options->compaction_readahead_size = options.compaction_readahead_size;
env_options->random_access_max_buffer_size =
options.random_access_max_buffer_size;
env_options->rate_limiter = options.rate_limiter.get();
env_options->writable_file_max_buffer_size =
options.writable_file_max_buffer_size;
env_options->allow_fallocate = options.allow_fallocate;
env_options->strict_bytes_per_sync = options.strict_bytes_per_sync;
options.env->SanitizeEnvOptions(env_options);
}
}
EnvOptions Env::OptimizeForLogWrite(const EnvOptions& env_options,
const DBOptions& db_options) const {
EnvOptions optimized_env_options(env_options);
optimized_env_options.bytes_per_sync = db_options.wal_bytes_per_sync;
optimized_env_options.writable_file_max_buffer_size =
db_options.writable_file_max_buffer_size;
return optimized_env_options;
}
EnvOptions Env::OptimizeForManifestWrite(const EnvOptions& env_options) const {
return env_options;
}
EnvOptions Env::OptimizeForLogRead(const EnvOptions& env_options) const {
EnvOptions optimized_env_options(env_options);
optimized_env_options.use_direct_reads = false;
return optimized_env_options;
}
EnvOptions Env::OptimizeForManifestRead(const EnvOptions& env_options) const {
EnvOptions optimized_env_options(env_options);
optimized_env_options.use_direct_reads = false;
return optimized_env_options;
}
EnvOptions Env::OptimizeForCompactionTableWrite(
const EnvOptions& env_options, const ImmutableDBOptions& db_options) const {
EnvOptions optimized_env_options(env_options);
optimized_env_options.use_direct_writes =
db_options.use_direct_io_for_flush_and_compaction;
return optimized_env_options;
}
EnvOptions Env::OptimizeForCompactionTableRead(
const EnvOptions& env_options, const ImmutableDBOptions& db_options) const {
EnvOptions optimized_env_options(env_options);
optimized_env_options.use_direct_reads = db_options.use_direct_reads;
return optimized_env_options;
}
EnvOptions::EnvOptions(const DBOptions& options) {
AssignEnvOptions(this, options);
}
EnvOptions::EnvOptions() {
DBOptions options;
AssignEnvOptions(this, options);
}
Status NewEnvLogger(const std::string& fname, Env* env,
std::shared_ptr<Logger>* result) {
EnvOptions options;
// TODO: Tune the buffer size.
options.writable_file_max_buffer_size = 1024 * 1024;
std::unique_ptr<WritableFile> writable_file;
const auto status = env->NewWritableFile(fname, &writable_file, options);
if (!status.ok()) {
return status;
}
*result = std::make_shared<EnvLogger>(
NewLegacyWritableFileWrapper(std::move(writable_file)), fname, options,
env);
return Status::OK();
}
const std::shared_ptr<FileSystem>& Env::GetFileSystem() const {
return file_system_;
}
const std::shared_ptr<SystemClock>& Env::GetSystemClock() const {
return system_clock_;
}
} // namespace ROCKSDB_NAMESPACE