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-rw-r--r-- | src/rocksdb/include/rocksdb/utilities/debug.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/src/rocksdb/include/rocksdb/utilities/debug.h b/src/rocksdb/include/rocksdb/utilities/debug.h new file mode 100644 index 000000000..0e0526557 --- /dev/null +++ b/src/rocksdb/include/rocksdb/utilities/debug.h @@ -0,0 +1,48 @@ +// Copyright (c) 2017-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 "rocksdb/db.h" +#include "rocksdb/types.h" + +namespace ROCKSDB_NAMESPACE { + +// Data associated with a particular version of a key. A database may internally +// store multiple versions of a same user key due to snapshots, compaction not +// happening yet, etc. +struct KeyVersion { + KeyVersion() : user_key(""), value(""), sequence(0), type(0) {} + + KeyVersion(const std::string& _user_key, const std::string& _value, + SequenceNumber _sequence, int _type) + : user_key(_user_key), value(_value), sequence(_sequence), type(_type) {} + + std::string user_key; + std::string value; + SequenceNumber sequence; + int type; + std::string GetTypeName() const; +}; + +// Returns listing of all versions of keys in the provided user key range. +// The range is inclusive-inclusive, i.e., [`begin_key`, `end_key`], or +// `max_num_ikeys` has been reached. Since all those keys returned will be +// copied to memory, if the range covers too many keys, the memory usage +// may be huge. `max_num_ikeys` can be used to cap the memory usage. +// The result is inserted into the provided vector, `key_versions`. +Status GetAllKeyVersions(DB* db, Slice begin_key, Slice end_key, + size_t max_num_ikeys, + std::vector<KeyVersion>* key_versions); + +Status GetAllKeyVersions(DB* db, ColumnFamilyHandle* cfh, Slice begin_key, + Slice end_key, size_t max_num_ikeys, + std::vector<KeyVersion>* key_versions); + +} // namespace ROCKSDB_NAMESPACE + +#endif // ROCKSDB_LITE |