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57 lines
1.9 KiB
C++
57 lines
1.9 KiB
C++
#pragma once
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#include "config_core.h"
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#if USE_ROCKSDB
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#include <Storages/MergeTree/IPartMetadataManager.h>
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#include <Storages/MergeTree/MergeTreeMetadataCache.h>
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namespace DB
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{
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/// PartMetadataManagerWithCache stores metadatas of part in RocksDB as cache layer to speed up
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/// loading process of merge tree table.
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class PartMetadataManagerWithCache : public IPartMetadataManager
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{
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public:
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PartMetadataManagerWithCache(const IMergeTreeDataPart * part_, const MergeTreeMetadataCachePtr & cache_);
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~PartMetadataManagerWithCache() override = default;
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/// First read the metadata from RocksDB cache, then from disk.
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std::unique_ptr<SeekableReadBuffer> read(const String & file_name) const override;
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/// First judge existence of the metadata in RocksDB cache, then in disk.
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bool exists(const String & file_name) const override;
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/// Delete all metadatas in part from RocksDB cache.
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void deleteAll(bool include_projection) override;
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/// Assert all metadatas in part from RocksDB cache are deleted.
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void assertAllDeleted(bool include_projection) const override;
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/// Update all metadatas in part from RocksDB cache.
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/// Need to be called after part directory is renamed.
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void updateAll(bool include_projection) override;
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/// Check if all metadatas in part from RocksDB cache are up to date.
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std::unordered_map<String, uint128> check() const override;
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private:
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/// Get cache key from path of metadata file.
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/// Format: <disk_name>:relative/full/path/of/metadata/file
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String getKeyFromFilePath(const String & file_path) const;
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/// Get metadata file path from cache key.
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String getFilePathFromKey(const String & key) const;
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/// Get cache keys and checksums of corresponding metadata in a part(including projection parts)
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void getKeysAndCheckSums(Strings & keys, std::vector<uint128> & checksums) const;
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MergeTreeMetadataCachePtr cache;
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};
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}
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#endif
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