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

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Zitan Chen b923dc720b BackupEngine computes table checksums only once if db session ids are available (#7110) ... Summary: BackupEngine requires computing table checksums twice when backing up table files to the `shared_checksum` directory. The repeated computation can be avoided by utilizing the db session id stored as a part of the table properties. Filenames of table files in the `shared_checksum` directory depend on the following conditions: 1. the naming scheme is `kOptionalChecksumAndDbSessionId`, 2. `db_session_id` is not empty, 3. checksum is available in the DB manifest. If 1,2,3 are satisfied, then the filenames will be of the form `<file_number>_<checksum>_<db_session_id>.sst`. If 1,2 are satisfied, then the filenames will be of the form `<file_number>_<db_session_id>.sst`. In all other cases, the filenames are of the form `<file_number>_<checksum>_<size>.sst`. Additionally, if `kOptionalChecksumAndDbSessionId` is used (and not falling back to `kChecksumAndFileSize`), the `<checksum>` appeared in the filenames is hexadecimally encoded, instead of being plain `uint32_t` value. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7110 Test Plan: backupable_db_test and manual tests. Reviewed By: ajkr Differential Revision: D22508992 Pulled By: gg814 fbshipit-source-id: 5669f0ea9ad5a097f69f6d87aca4abba15032389		5 years ago
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rocksdb	BackupEngine computes table checksums only once if db session ids are available (#7110)	5 years ago