6f62322fe4
Summary: The patch adds a couple of classes to represent metadata about blob files: `SharedBlobFileMetaData` contains the information elements that are immutable (once the blob file is closed), e.g. blob file number, total number and size of blob files, checksum method/value, while `BlobFileMetaData` contains attributes that can vary across versions like the amount of garbage in the file. There is a single `SharedBlobFileMetaData` for each blob file, which is jointly owned by the `BlobFileMetaData` objects that point to it; `BlobFileMetaData` objects, in turn, are owned by `Version`s and can also be shared if the (immutable _and_ mutable) state of the blob file is the same in two versions. In addition, the patch adds the blob file metadata to `VersionStorageInfo`, and extends `VersionBuilder` so that it can apply blob file related `VersionEdit`s (i.e. those containing `BlobFileAddition`s and/or `BlobFileGarbage`), and save blob file metadata to a new `VersionStorageInfo`. Consistency checks are also extended to ensure that table files point to blob files that are part of the `Version`, and that all blob files that are part of any given `Version` have at least some _non_-garbage data in them. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6597 Test Plan: `make check` Reviewed By: riversand963 Differential Revision: D20656803 Pulled By: ltamasi fbshipit-source-id: f1f74d135045b3b42d0146f03ee576ef0a4bfd80
53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
// Copyright (c) 2011-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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#include "db/blob/blob_file_meta.h"
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#include <ostream>
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#include <sstream>
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namespace ROCKSDB_NAMESPACE {
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SharedBlobFileMetaData::~SharedBlobFileMetaData() {
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// TODO: add the blob file to the list of obsolete files here
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}
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std::string SharedBlobFileMetaData::DebugString() const {
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std::ostringstream oss;
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oss << (*this);
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return oss.str();
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}
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std::ostream& operator<<(std::ostream& os,
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const SharedBlobFileMetaData& shared_meta) {
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os << "blob_file_number: " << shared_meta.GetBlobFileNumber()
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<< " total_blob_count: " << shared_meta.GetTotalBlobCount()
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<< " total_blob_bytes: " << shared_meta.GetTotalBlobBytes()
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<< " checksum_method: " << shared_meta.GetChecksumMethod()
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<< " checksum_value: " << shared_meta.GetChecksumValue();
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return os;
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}
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std::string BlobFileMetaData::DebugString() const {
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std::ostringstream oss;
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oss << (*this);
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return oss.str();
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}
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std::ostream& operator<<(std::ostream& os, const BlobFileMetaData& meta) {
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const auto& shared_meta = meta.GetSharedMeta();
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assert(shared_meta);
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os << (*shared_meta) << " garbage_blob_count: " << meta.GetGarbageBlobCount()
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<< " garbage_blob_bytes: " << meta.GetGarbageBlobBytes();
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return os;
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}
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} // namespace ROCKSDB_NAMESPACE
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