afa2420c2b
Summary: The current Env API encompasses both storage/file operations, as well as OS related operations. Most of the APIs return a Status, which does not have enough metadata about an error, such as whether its retry-able or not, scope (i.e fault domain) of the error etc., that may be required in order to properly handle a storage error. The file APIs also do not provide enough control over the IO SLA, such as timeout, prioritization, hinting about placement and redundancy etc. This PR separates out the file/storage APIs from Env into a new FileSystem class. The APIs are updated to return an IOStatus with metadata about the error, as well as to take an IOOptions structure as input in order to allow more control over the IO. The user can set both ```options.env``` and ```options.file_system``` to specify that RocksDB should use the former for OS related operations and the latter for storage operations. Internally, a ```CompositeEnvWrapper``` has been introduced that inherits from ```Env``` and redirects individual methods to either an ```Env``` implementation or the ```FileSystem``` as appropriate. When options are sanitized during ```DB::Open```, ```options.env``` is replaced with a newly allocated ```CompositeEnvWrapper``` instance if both env and file_system have been specified. This way, the rest of the RocksDB code can continue to function as before. This PR also ports PosixEnv to the new API by splitting it into two - PosixEnv and PosixFileSystem. PosixEnv is defined as a sub-class of CompositeEnvWrapper, and threading/time functions are overridden with Posix specific implementations in order to avoid an extra level of indirection. The ```CompositeEnvWrapper``` translates ```IOStatus``` return code to ```Status```, and sets the severity to ```kSoftError``` if the io_status is retryable. The error handling code in RocksDB can then recover the DB automatically. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5761 Differential Revision: D18868376 Pulled By: anand1976 fbshipit-source-id: 39efe18a162ea746fabac6360ff529baba48486f
89 lines
3.8 KiB
C++
89 lines
3.8 KiB
C++
// 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.
|
|
#pragma once
|
|
#include <string>
|
|
#include <utility>
|
|
#include <vector>
|
|
#include "db/range_tombstone_fragmenter.h"
|
|
#include "db/table_properties_collector.h"
|
|
#include "logging/event_logger.h"
|
|
#include "options/cf_options.h"
|
|
#include "rocksdb/comparator.h"
|
|
#include "rocksdb/env.h"
|
|
#include "rocksdb/listener.h"
|
|
#include "rocksdb/options.h"
|
|
#include "rocksdb/status.h"
|
|
#include "rocksdb/table_properties.h"
|
|
#include "rocksdb/types.h"
|
|
#include "table/scoped_arena_iterator.h"
|
|
|
|
namespace rocksdb {
|
|
|
|
struct Options;
|
|
struct FileMetaData;
|
|
|
|
class Env;
|
|
struct EnvOptions;
|
|
class Iterator;
|
|
class SnapshotChecker;
|
|
class TableCache;
|
|
class VersionEdit;
|
|
class TableBuilder;
|
|
class WritableFileWriter;
|
|
class InternalStats;
|
|
|
|
// @param column_family_name Name of the column family that is also identified
|
|
// by column_family_id, or empty string if unknown. It must outlive the
|
|
// TableBuilder returned by this function.
|
|
TableBuilder* NewTableBuilder(
|
|
const ImmutableCFOptions& options, const MutableCFOptions& moptions,
|
|
const InternalKeyComparator& internal_comparator,
|
|
const std::vector<std::unique_ptr<IntTblPropCollectorFactory>>*
|
|
int_tbl_prop_collector_factories,
|
|
uint32_t column_family_id, const std::string& column_family_name,
|
|
WritableFileWriter* file, const CompressionType compression_type,
|
|
const uint64_t sample_for_compression,
|
|
const CompressionOptions& compression_opts, int level,
|
|
const bool skip_filters = false, const uint64_t creation_time = 0,
|
|
const uint64_t oldest_key_time = 0, const uint64_t target_file_size = 0,
|
|
const uint64_t file_creation_time = 0);
|
|
|
|
// Build a Table file from the contents of *iter. The generated file
|
|
// will be named according to number specified in meta. On success, the rest of
|
|
// *meta will be filled with metadata about the generated table.
|
|
// If no data is present in *iter, meta->file_size will be set to
|
|
// zero, and no Table file will be produced.
|
|
//
|
|
// @param column_family_name Name of the column family that is also identified
|
|
// by column_family_id, or empty string if unknown.
|
|
extern Status BuildTable(
|
|
const std::string& dbname, Env* env, FileSystem* fs,
|
|
const ImmutableCFOptions& options,
|
|
const MutableCFOptions& mutable_cf_options, const FileOptions& file_options,
|
|
TableCache* table_cache, InternalIterator* iter,
|
|
std::vector<std::unique_ptr<FragmentedRangeTombstoneIterator>>
|
|
range_del_iters,
|
|
FileMetaData* meta, const InternalKeyComparator& internal_comparator,
|
|
const std::vector<std::unique_ptr<IntTblPropCollectorFactory>>*
|
|
int_tbl_prop_collector_factories,
|
|
uint32_t column_family_id, const std::string& column_family_name,
|
|
std::vector<SequenceNumber> snapshots,
|
|
SequenceNumber earliest_write_conflict_snapshot,
|
|
SnapshotChecker* snapshot_checker, const CompressionType compression,
|
|
const uint64_t sample_for_compression,
|
|
const CompressionOptions& compression_opts, bool paranoid_file_checks,
|
|
InternalStats* internal_stats, TableFileCreationReason reason,
|
|
EventLogger* event_logger = nullptr, int job_id = 0,
|
|
const Env::IOPriority io_priority = Env::IO_HIGH,
|
|
TableProperties* table_properties = nullptr, int level = -1,
|
|
const uint64_t creation_time = 0, const uint64_t oldest_key_time = 0,
|
|
Env::WriteLifeTimeHint write_hint = Env::WLTH_NOT_SET,
|
|
const uint64_t file_creation_time = 0);
|
|
|
|
} // namespace rocksdb
|