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rocksdb/util/delete_scheduler_impl.cc

229 lines
6.3 KiB

// Copyright (c) 2015, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
#include <thread>
#include <vector>
#include "port/port.h"
#include "rocksdb/env.h"
#include "util/delete_scheduler_impl.h"
#include "util/mutexlock.h"
#include "util/sync_point.h"
namespace rocksdb {
DeleteSchedulerImpl::DeleteSchedulerImpl(Env* env, const std::string& trash_dir,
int64_t rate_bytes_per_sec,
std::shared_ptr<Logger> info_log)
: env_(env),
trash_dir_(trash_dir),
rate_bytes_per_sec_(rate_bytes_per_sec),
pending_files_(0),
closing_(false),
cv_(&mu_),
info_log_(info_log) {
if (rate_bytes_per_sec_ == 0) {
// Rate limiting is disabled
bg_thread_.reset();
} else {
bg_thread_.reset(
new std::thread(&DeleteSchedulerImpl::BackgroundEmptyTrash, this));
}
}
DeleteSchedulerImpl::~DeleteSchedulerImpl() {
{
MutexLock l(&mu_);
closing_ = true;
cv_.SignalAll();
}
if (bg_thread_) {
bg_thread_->join();
}
}
Status DeleteSchedulerImpl::DeleteFile(const std::string& file_path) {
if (rate_bytes_per_sec_ == 0) {
// Rate limiting is disabled
return env_->DeleteFile(file_path);
}
// Move file to trash
std::string path_in_trash;
Status s = MoveToTrash(file_path, &path_in_trash);
if (!s.ok()) {
Log(InfoLogLevel::ERROR_LEVEL, info_log_,
"Failed to move %s to trash directory (%s)", file_path.c_str(),
trash_dir_.c_str());
return env_->DeleteFile(file_path);
}
// Add file to delete queue
{
MutexLock l(&mu_);
queue_.push(path_in_trash);
pending_files_++;
if (pending_files_ == 1) {
cv_.SignalAll();
}
}
return s;
}
std::map<std::string, Status> DeleteSchedulerImpl::GetBackgroundErrors() {
MutexLock l(&mu_);
return bg_errors_;
}
Status DeleteSchedulerImpl::MoveToTrash(const std::string& file_path,
std::string* path_in_trash) {
Status s;
// Figure out the name of the file in trash folder
size_t idx = file_path.rfind("/");
if (idx == std::string::npos || idx == file_path.size() - 1) {
return Status::InvalidArgument("file_path is corrupted");
}
*path_in_trash = trash_dir_ + file_path.substr(idx);
std::string unique_suffix = "";
if (*path_in_trash == file_path) {
// This file is already in trash
return s;
}
// TODO(tec) : Implement Env::RenameFileIfNotExist and remove
// file_move_mu mutex.
MutexLock l(&file_move_mu_);
while (true) {
s = env_->FileExists(*path_in_trash + unique_suffix);
if (s.IsNotFound()) {
// We found a path for our file in trash
*path_in_trash += unique_suffix;
s = env_->RenameFile(file_path, *path_in_trash);
break;
} else if (s.ok()) {
// Name conflict, generate new random suffix
unique_suffix = env_->GenerateUniqueId();
} else {
// Error during FileExists call, we cannot continue
break;
}
}
return s;
}
void DeleteSchedulerImpl::BackgroundEmptyTrash() {
TEST_SYNC_POINT("DeleteSchedulerImpl::BackgroundEmptyTrash");
while (true) {
MutexLock l(&mu_);
while (queue_.empty() && !closing_) {
cv_.Wait();
}
if (closing_) {
return;
}
// Delete all files in queue_
uint64_t start_time = env_->NowMicros();
uint64_t total_deleted_bytes = 0;
while (!queue_.empty() && !closing_) {
std::string path_in_trash = queue_.front();
queue_.pop();
// We dont need to hold the lock while deleting the file
mu_.Unlock();
uint64_t deleted_bytes = 0;
// Delete file from trash and update total_penlty value
Status s = DeleteTrashFile(path_in_trash, &deleted_bytes);
total_deleted_bytes += deleted_bytes;
mu_.Lock();
if (!s.ok()) {
bg_errors_[path_in_trash] = s;
}
// Apply penlty if necessary
uint64_t total_penlty =
((total_deleted_bytes * kMicrosInSecond) / rate_bytes_per_sec_);
while (!closing_ && !cv_.TimedWait(start_time + total_penlty)) {}
pending_files_--;
if (pending_files_ == 0) {
// Unblock TEST_WaitForEmptyTrash since there are no more files waiting
// to be deleted
cv_.SignalAll();
}
}
}
}
Status DeleteSchedulerImpl::DeleteTrashFile(const std::string& path_in_trash,
uint64_t* deleted_bytes) {
uint64_t file_size;
Status s = env_->GetFileSize(path_in_trash, &file_size);
if (s.ok()) {
TEST_SYNC_POINT("DeleteSchedulerImpl::DeleteTrashFile:DeleteFile");
s = env_->DeleteFile(path_in_trash);
}
if (!s.ok()) {
// Error while getting file size or while deleting
Log(InfoLogLevel::ERROR_LEVEL, info_log_,
"Failed to delete %s from trash -- %s", path_in_trash.c_str(),
s.ToString().c_str());
*deleted_bytes = 0;
} else {
*deleted_bytes = file_size;
}
return s;
}
void DeleteSchedulerImpl::TEST_WaitForEmptyTrash() {
MutexLock l(&mu_);
while (pending_files_ > 0 && !closing_) {
cv_.Wait();
}
}
DeleteScheduler* NewDeleteScheduler(Env* env, const std::string& trash_dir,
int64_t rate_bytes_per_sec,
std::shared_ptr<Logger> info_log,
bool delete_exisitng_trash,
Status* status) {
DeleteScheduler* res =
new DeleteSchedulerImpl(env, trash_dir, rate_bytes_per_sec, info_log);
Status s;
if (trash_dir != "") {
s = env->CreateDirIfMissing(trash_dir);
if (s.ok() && delete_exisitng_trash) {
std::vector<std::string> files_in_trash;
s = env->GetChildren(trash_dir, &files_in_trash);
if (s.ok()) {
for (const std::string& trash_file : files_in_trash) {
if (trash_file == "." || trash_file == "..") {
continue;
}
Status file_delete = res->DeleteFile(trash_dir + "/" + trash_file);
if (s.ok() && !file_delete.ok()) {
s = file_delete;
}
}
}
}
}
if (status) {
*status = s;
}
return res;
}
} // namespace rocksdb