9c0c8f5ff6
Summary: Right now, `ldb idump` may have memory out of control if there is a big range of tombstones. Add an option to cut maxinum number of keys in GetAllKeyVersions(), and push down --max_num_ikeys from ldb. Pull Request resolved: https://github.com/facebook/rocksdb/pull/4271 Differential Revision: D9369149 Pulled By: siying fbshipit-source-id: 7cbb797b7d2fa16573495a7e84937456d3ff25bf
46 lines
1.7 KiB
C++
46 lines
1.7 KiB
C++
// Copyright (c) 2017-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#ifndef ROCKSDB_LITE
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#include "rocksdb/db.h"
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#include "rocksdb/types.h"
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namespace rocksdb {
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// Data associated with a particular version of a key. A database may internally
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// store multiple versions of a same user key due to snapshots, compaction not
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// happening yet, etc.
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struct KeyVersion {
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KeyVersion() : user_key(""), value(""), sequence(0), type(0) {}
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KeyVersion(const std::string& _user_key, const std::string& _value,
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SequenceNumber _sequence, int _type)
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: user_key(_user_key), value(_value), sequence(_sequence), type(_type) {}
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std::string user_key;
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std::string value;
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SequenceNumber sequence;
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// TODO(ajkr): we should provide a helper function that converts the int to a
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// string describing the type for easier debugging.
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int type;
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};
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// Returns listing of all versions of keys in the provided user key range.
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// The range is inclusive-inclusive, i.e., [`begin_key`, `end_key`], or
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// `max_num_ikeys` has been reached. Since all those keys returned will be
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// copied to memory, if the range covers too many keys, the memory usage
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// may be huge. `max_num_ikeys` can be used to cap the memory usage.
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// The result is inserted into the provided vector, `key_versions`.
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Status GetAllKeyVersions(DB* db, Slice begin_key, Slice end_key,
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size_t max_num_ikeys,
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std::vector<KeyVersion>* key_versions);
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} // namespace rocksdb
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#endif // ROCKSDB_LITE
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