mirror of https://github.com/facebook/rocksdb.git
96 lines
3.3 KiB
C++
96 lines
3.3 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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#pragma once
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#include <string>
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#include "port/port.h"
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#include "rocksdb/sst_file_manager.h"
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#include "util/delete_scheduler.h"
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namespace rocksdb {
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class Env;
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class Logger;
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// SstFileManager is used to track SST files in the DB and control there
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// deletion rate.
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// All SstFileManager public functions are thread-safe.
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class SstFileManagerImpl : public SstFileManager {
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public:
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explicit SstFileManagerImpl(Env* env, std::shared_ptr<Logger> logger,
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const std::string& trash_dir,
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int64_t rate_bytes_per_sec);
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~SstFileManagerImpl();
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// DB will call OnAddFile whenever a new sst file is added.
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Status OnAddFile(const std::string& file_path);
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// DB will call OnDeleteFile whenever an sst file is deleted.
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Status OnDeleteFile(const std::string& file_path);
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// DB will call OnMoveFile whenever an sst file is move to a new path.
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Status OnMoveFile(const std::string& old_path, const std::string& new_path);
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// Update the maximum allowed space that should be used by RocksDB, if
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// the total size of the SST files exceeds max_allowed_space, writes to
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// RocksDB will fail.
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//
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// Setting max_allowed_space to 0 will disable this feature, maximum allowed
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// space will be infinite (Default value).
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//
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// thread-safe.
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void SetMaxAllowedSpaceUsage(uint64_t max_allowed_space) override;
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// Return true if the total size of SST files exceeded the maximum allowed
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// space usage.
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//
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// thread-safe.
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bool IsMaxAllowedSpaceReached() override;
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// Return the total size of all tracked files.
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uint64_t GetTotalSize() override;
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// Return a map containing all tracked files and there corresponding sizes.
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std::unordered_map<std::string, uint64_t> GetTrackedFiles() override;
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// Return delete rate limit in bytes per second.
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virtual int64_t GetDeleteRateBytesPerSecond() override;
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// Move file to trash directory and schedule it's deletion.
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virtual Status ScheduleFileDeletion(const std::string& file_path);
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// Wait for all files being deleteing in the background to finish or for
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// destructor to be called.
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virtual void WaitForEmptyTrash();
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private:
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// REQUIRES: mutex locked
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void OnAddFileImpl(const std::string& file_path, uint64_t file_size);
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// REQUIRES: mutex locked
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void OnDeleteFileImpl(const std::string& file_path);
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Env* env_;
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std::shared_ptr<Logger> logger_;
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// Mutex to protect tracked_files_, total_files_size_
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port::Mutex mu_;
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// The summation of the sizes of all files in tracked_files_ map
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uint64_t total_files_size_;
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// A map containing all tracked files and there sizes
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// file_path => file_size
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std::unordered_map<std::string, uint64_t> tracked_files_;
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// The maximum allowed space (in bytes) for sst files.
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uint64_t max_allowed_space_;
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// DeleteScheduler used to throttle file deletition, if SstFileManagerImpl was
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// created with rate_bytes_per_sec == 0 or trash_dir == "", delete_scheduler_
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// rate limiting will be disabled and will simply delete the files.
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DeleteScheduler delete_scheduler_;
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};
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} // namespace rocksdb
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