dafa584fd1
Summary: This allows the wrapper classes to own the wrapped object and eliminates confusion as to ownership. Previously, many classes implemented their own ownership solutions. Fixes https://github.com/facebook/rocksdb/issues/8606 Pull Request resolved: https://github.com/facebook/rocksdb/pull/8618 Reviewed By: pdillinger Differential Revision: D30136064 Pulled By: mrambacher fbshipit-source-id: d0bf471df8818dbb1770a86335fe98f761cca193
153 lines
5.4 KiB
C++
153 lines
5.4 KiB
C++
// Copyright (c) Facebook, Inc. and its affiliates. 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 "tools/simulated_hybrid_file_system.h"
|
|
|
|
#include <algorithm>
|
|
#include <sstream>
|
|
#include <string>
|
|
|
|
#include "rocksdb/rate_limiter.h"
|
|
|
|
namespace ROCKSDB_NAMESPACE {
|
|
|
|
const int kLatencyAddedPerRequestUs = 15000;
|
|
const int64_t kRequestPerSec = 100;
|
|
const int64_t kDummyBytesPerRequest = 1024 * 1024;
|
|
|
|
// The metadata file format: each line is a full filename of a file which is
|
|
// warm
|
|
SimulatedHybridFileSystem::SimulatedHybridFileSystem(
|
|
const std::shared_ptr<FileSystem>& base,
|
|
const std::string& metadata_file_name)
|
|
: FileSystemWrapper(base),
|
|
// Limit to 100 requests per second.
|
|
rate_limiter_(NewGenericRateLimiter(
|
|
kDummyBytesPerRequest * kRequestPerSec /* rate_bytes_per_sec */,
|
|
1000 /* refill_period_us */)),
|
|
metadata_file_name_(metadata_file_name),
|
|
name_("SimulatedHybridFileSystem: " + std::string(target()->Name())) {
|
|
IOStatus s = base->FileExists(metadata_file_name, IOOptions(), nullptr);
|
|
if (s.IsNotFound()) {
|
|
return;
|
|
}
|
|
std::string metadata;
|
|
s = ReadFileToString(base.get(), metadata_file_name, &metadata);
|
|
if (!s.ok()) {
|
|
fprintf(stderr, "Error reading from file %s: %s",
|
|
metadata_file_name.c_str(), s.ToString().c_str());
|
|
// Exit rather than assert as this file system is built to run with
|
|
// benchmarks, which usually run on release mode.
|
|
std::exit(1);
|
|
}
|
|
std::istringstream input;
|
|
input.str(metadata);
|
|
std::string line;
|
|
while (std::getline(input, line)) {
|
|
fprintf(stderr, "Warm file %s\n", line.c_str());
|
|
warm_file_set_.insert(line);
|
|
}
|
|
}
|
|
|
|
// Need to write out the metadata file to file. See comment of
|
|
// SimulatedHybridFileSystem::SimulatedHybridFileSystem() for format of the
|
|
// file.
|
|
SimulatedHybridFileSystem::~SimulatedHybridFileSystem() {
|
|
std::string metadata;
|
|
for (const auto& f : warm_file_set_) {
|
|
metadata += f;
|
|
metadata += "\n";
|
|
}
|
|
IOStatus s = WriteStringToFile(target(), metadata, metadata_file_name_, true);
|
|
if (!s.ok()) {
|
|
fprintf(stderr, "Error writing to file %s: %s", metadata_file_name_.c_str(),
|
|
s.ToString().c_str());
|
|
}
|
|
}
|
|
|
|
IOStatus SimulatedHybridFileSystem::NewRandomAccessFile(
|
|
const std::string& fname, const FileOptions& file_opts,
|
|
std::unique_ptr<FSRandomAccessFile>* result, IODebugContext* dbg) {
|
|
Temperature temperature = Temperature::kUnknown;
|
|
{
|
|
const std::lock_guard<std::mutex> lock(mutex_);
|
|
if (warm_file_set_.find(fname) != warm_file_set_.end()) {
|
|
temperature = Temperature::kWarm;
|
|
}
|
|
}
|
|
IOStatus s = target()->NewRandomAccessFile(fname, file_opts, result, dbg);
|
|
result->reset(
|
|
new SimulatedHybridRaf(std::move(*result), rate_limiter_, temperature));
|
|
return s;
|
|
}
|
|
|
|
IOStatus SimulatedHybridFileSystem::NewWritableFile(
|
|
const std::string& fname, const FileOptions& file_opts,
|
|
std::unique_ptr<FSWritableFile>* result, IODebugContext* dbg) {
|
|
if (file_opts.temperature == Temperature::kWarm) {
|
|
const std::lock_guard<std::mutex> lock(mutex_);
|
|
fprintf(stderr, "warm file %s\n", fname.c_str());
|
|
warm_file_set_.insert(fname);
|
|
}
|
|
return target()->NewWritableFile(fname, file_opts, result, dbg);
|
|
}
|
|
|
|
IOStatus SimulatedHybridFileSystem::DeleteFile(const std::string& fname,
|
|
const IOOptions& options,
|
|
IODebugContext* dbg) {
|
|
{
|
|
const std::lock_guard<std::mutex> lock(mutex_);
|
|
warm_file_set_.erase(fname);
|
|
}
|
|
return target()->DeleteFile(fname, options, dbg);
|
|
}
|
|
|
|
IOStatus SimulatedHybridRaf::Read(uint64_t offset, size_t n,
|
|
const IOOptions& options, Slice* result,
|
|
char* scratch, IODebugContext* dbg) const {
|
|
if (temperature_ == Temperature::kWarm) {
|
|
Env::Default()->SleepForMicroseconds(kLatencyAddedPerRequestUs);
|
|
RequestRateLimit(1);
|
|
}
|
|
return target()->Read(offset, n, options, result, scratch, dbg);
|
|
}
|
|
|
|
IOStatus SimulatedHybridRaf::MultiRead(FSReadRequest* reqs, size_t num_reqs,
|
|
const IOOptions& options,
|
|
IODebugContext* dbg) {
|
|
if (temperature_ == Temperature::kWarm) {
|
|
RequestRateLimit(static_cast<int64_t>(num_reqs));
|
|
Env::Default()->SleepForMicroseconds(kLatencyAddedPerRequestUs *
|
|
static_cast<int>(num_reqs));
|
|
}
|
|
return target()->MultiRead(reqs, num_reqs, options, dbg);
|
|
}
|
|
|
|
IOStatus SimulatedHybridRaf::Prefetch(uint64_t offset, size_t n,
|
|
const IOOptions& options,
|
|
IODebugContext* dbg) {
|
|
if (temperature_ == Temperature::kWarm) {
|
|
RequestRateLimit(1);
|
|
Env::Default()->SleepForMicroseconds(kLatencyAddedPerRequestUs);
|
|
}
|
|
return target()->Prefetch(offset, n, options, dbg);
|
|
}
|
|
|
|
void SimulatedHybridRaf::RequestRateLimit(int64_t num_requests) const {
|
|
int64_t left = num_requests * kDummyBytesPerRequest;
|
|
const int64_t kMaxToRequest = kDummyBytesPerRequest / 100;
|
|
while (left > 0) {
|
|
int64_t to_request = std::min(kMaxToRequest, left);
|
|
rate_limiter_->Request(to_request, Env::IOPriority::IO_LOW, nullptr);
|
|
left -= to_request;
|
|
}
|
|
}
|
|
|
|
} // namespace ROCKSDB_NAMESPACE
|
|
|
|
#endif // ROCKSDB_LITE
|