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Mention sst_dump cmd=recompress changes (#5807)

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Summary:
As requested by siying in https://github.com/facebook/rocksdb/pull/5791#issuecomment-531417468
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5807

Differential Revision: D17399349

fbshipit-source-id: 5986c3894f356becd393fee0f1aeadcd9affc798
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Peter (Stig) Edwards 2019-09-16 10:42:55 -07:00 committed by Facebook Github Bot
parent b931f84e56
commit 54fc617891
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@ -10,6 +10,7 @@
* VerifyChecksum() by default will issue readahead. Allow ReadOptions to be passed in to those functions to override the readhead size. For checksum verifying before external SST file ingestion, a new option IngestExternalFileOptions.verify_checksums_readahead_size, is added for this readahead setting.
* When user uses options.force_consistency_check in RocksDb, instead of crashing the process, we now pass the error back to the users without killing the process.
* Add an option `memtable_insert_hint_per_batch` to WriteOptions. If it is true, each WriteBatch will maintain its own insert hints for each memtable in concurrent write. See include/rocksdb/options.h for more details.
* The `sst_dump` command line tool `recompress` command now displays how many blocks were compressed and how many were not, in particular how many were not compressed because the compression ratio was not met (12.5% threshold for GoodCompressionRatio), as seen in the `number.block.not_compressed` counter stat since version 6.0.0.
### Public API Change
* Added max_write_buffer_size_to_maintain option to better control memory usage of immutable memtables.
* Added a lightweight API GetCurrentWalFile() to get last live WAL filename and size. Meant to be used as a helper for backup/restore tooling in a larger ecosystem such as MySQL with a MyRocks storage engine.