fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph

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Levi Tamasi 22655a398b Introduce a blob file reader class (#7461) ... Summary: The patch adds a class called `BlobFileReader` that can be used to retrieve blobs using the information available in blob references (e.g. blob file number, offset, and size). This will come in handy when implementing blob support for `Get`, `MultiGet`, and iterators, and also for compaction/garbage collection. When a `BlobFileReader` object is created (using the factory method `Create`), it first checks whether the specified file is potentially valid by comparing the file size against the combined size of the blob file header and footer (files smaller than the threshold are considered malformed). Then, it opens the file, and reads and verifies the header and footer. The verification involves magic number/CRC checks as well as checking for unexpected header/footer fields, e.g. incorrect column family ID or TTL blob files. Blobs can be retrieved using `GetBlob`. `GetBlob` validates the offset and compression type passed by the caller (because of the presence of the header and footer, the specified offset cannot be too close to the start/end of the file; also, the compression type has to match the one in the blob file header), and retrieves and potentially verifies and uncompresses the blob. In particular, when `ReadOptions::verify_checksums` is set, `BlobFileReader` reads the blob record header as well (as opposed to just the blob itself) and verifies the key/value size, the key itself, as well as the CRC of the blob record header and the key/value pair. In addition, the patch exposes the compression type from `BlobIndex` (both using an accessor and via `DebugString`), and adds a blob file read latency histogram to `InternalStats` that can be used with `BlobFileReader`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7461 Test Plan: `make check` Reviewed By: riversand963 Differential Revision: D23999219 Pulled By: ltamasi fbshipit-source-id: deb6b1160d251258b308d5156e2ec063c3e12e5e		4 years ago
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blob_constants.h	Move BlobDB related files under db/ to db/blob/ (#6519)	4 years ago
blob_file_addition.cc	Move BlobDB related files under db/ to db/blob/ (#6519)	4 years ago
blob_file_addition.h	Move BlobDB related files under db/ to db/blob/ (#6519)	4 years ago
blob_file_addition_test.cc	Move BlobDB related files under db/ to db/blob/ (#6519)	4 years ago
blob_file_builder.cc	Integrate blob file writing with the flush logic (#7345)	4 years ago
blob_file_builder.h	Integrate blob file writing with the flush logic (#7345)	4 years ago
blob_file_builder_test.cc	Integrate blob file writing with the flush logic (#7345)	4 years ago
blob_file_garbage.cc	Move BlobDB related files under db/ to db/blob/ (#6519)	4 years ago
blob_file_garbage.h	Move BlobDB related files under db/ to db/blob/ (#6519)	4 years ago
blob_file_garbage_test.cc	Move BlobDB related files under db/ to db/blob/ (#6519)	4 years ago
blob_file_meta.cc	Maintain the set of linked SSTs in BlobFileMetaData (#6945)	4 years ago
blob_file_meta.h	Maintain the set of linked SSTs in BlobFileMetaData (#6945)	4 years ago
blob_file_reader.cc	Introduce a blob file reader class (#7461)	4 years ago
blob_file_reader.h	Introduce a blob file reader class (#7461)	4 years ago
blob_file_reader_test.cc	Introduce a blob file reader class (#7461)	4 years ago
blob_index.h	Introduce a blob file reader class (#7461)	4 years ago
blob_log_format.cc	Introduce a blob file reader class (#7461)	4 years ago
blob_log_format.h	Introduce a blob file reader class (#7461)	4 years ago
blob_log_reader.cc	Add a blob file builder class that can be used in background jobs (#7306)	4 years ago
blob_log_reader.h	Add a blob file builder class that can be used in background jobs (#7306)	4 years ago
blob_log_writer.cc	Add a blob file builder class that can be used in background jobs (#7306)	4 years ago
blob_log_writer.h	Add a blob file builder class that can be used in background jobs (#7306)	4 years ago
db_blob_index_test.cc	Whole DBTest to skip fsync (#7274)	4 years ago