mirror of
https://github.com/facebook/rocksdb.git
synced 2024-11-27 20:43:57 +00:00
02693f64fc
Summary: Implements ValidateSnapshot for WritePrepared txns and also adds a unit test to clarify the contract of this function. Closes https://github.com/facebook/rocksdb/pull/3101 Differential Revision: D6199405 Pulled By: maysamyabandeh fbshipit-source-id: ace509934c307ea5d26f4bbac5f836d7c80fd240
83 lines
2.7 KiB
C++
83 lines
2.7 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).
|
|
|
|
#pragma once
|
|
|
|
#ifndef ROCKSDB_LITE
|
|
|
|
#include <string>
|
|
#include <unordered_map>
|
|
|
|
#include "db/read_callback.h"
|
|
|
|
#include "rocksdb/db.h"
|
|
#include "rocksdb/slice.h"
|
|
#include "rocksdb/status.h"
|
|
#include "rocksdb/types.h"
|
|
|
|
namespace rocksdb {
|
|
|
|
struct TransactionKeyMapInfo {
|
|
// Earliest sequence number that is relevant to this transaction for this key
|
|
SequenceNumber seq;
|
|
|
|
uint32_t num_writes;
|
|
uint32_t num_reads;
|
|
|
|
bool exclusive;
|
|
|
|
explicit TransactionKeyMapInfo(SequenceNumber seq_no)
|
|
: seq(seq_no), num_writes(0), num_reads(0), exclusive(false) {}
|
|
};
|
|
|
|
using TransactionKeyMap =
|
|
std::unordered_map<uint32_t,
|
|
std::unordered_map<std::string, TransactionKeyMapInfo>>;
|
|
|
|
class DBImpl;
|
|
struct SuperVersion;
|
|
class WriteBatchWithIndex;
|
|
|
|
class TransactionUtil {
|
|
public:
|
|
// Verifies there have been no commits to this key in the db since this
|
|
// sequence number.
|
|
//
|
|
// If cache_only is true, then this function will not attempt to read any
|
|
// SST files. This will make it more likely this function will
|
|
// return an error if it is unable to determine if there are any conflicts.
|
|
//
|
|
// Returns OK on success, BUSY if there is a conflicting write, or other error
|
|
// status for any unexpected errors.
|
|
static Status CheckKeyForConflicts(DBImpl* db_impl,
|
|
ColumnFamilyHandle* column_family,
|
|
const std::string& key,
|
|
SequenceNumber snap_seq, bool cache_only,
|
|
ReadCallback* snap_checker = nullptr);
|
|
|
|
// For each key,SequenceNumber pair in the TransactionKeyMap, this function
|
|
// will verify there have been no writes to the key in the db since that
|
|
// sequence number.
|
|
//
|
|
// Returns OK on success, BUSY if there is a conflicting write, or other error
|
|
// status for any unexpected errors.
|
|
//
|
|
// REQUIRED: this function should only be called on the write thread or if the
|
|
// mutex is held.
|
|
static Status CheckKeysForConflicts(DBImpl* db_impl,
|
|
const TransactionKeyMap& keys,
|
|
bool cache_only);
|
|
|
|
private:
|
|
static Status CheckKey(DBImpl* db_impl, SuperVersion* sv,
|
|
SequenceNumber earliest_seq, SequenceNumber snap_seq,
|
|
const std::string& key, bool cache_only,
|
|
ReadCallback* snap_checker = nullptr);
|
|
};
|
|
|
|
} // namespace rocksdb
|
|
|
|
#endif // ROCKSDB_LITE
|