b00761eea6
Summary: Since we do not evict a file's blocks from block cache before that file is deleted, we require a file's cache ID prefix is both unique and non-reusable. However, the Windows functionality we were relying on only guaranteed uniqueness. That meant a newly created file could be assigned the same cache ID prefix as a deleted file. If the newly created file had block offsets matching the deleted file, full cache keys could be exactly the same, resulting in obsolete data blocks returned from cache when trying to read from the new file. We noticed this when running on FAT32 where compaction was writing out of order keys due to reading obsolete blocks from its input files. The functionality is documented as behaving the same on NTFS, although I wasn't able to repro it there. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5844 Test Plan: we had a reliable repro of out-of-order keys on FAT32 that was fixed by this change Differential Revision: D17752442 fbshipit-source-id: 95d983f9196cf415f269e19293b97341edbf7e00 |
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| db | ||
| docs | ||
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| examples | ||
| file | ||
| hdfs | ||
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| java | ||
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| AUTHORS | ||
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| CODE_OF_CONDUCT.md | ||
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| COPYING | ||
| DEFAULT_OPTIONS_HISTORY.md | ||
| DUMP_FORMAT.md | ||
| HISTORY.md | ||
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| LANGUAGE-BINDINGS.md | ||
| LICENSE.Apache | ||
| LICENSE.leveldb | ||
| Makefile | ||
| README.md | ||
| ROCKSDB_LITE.md | ||
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README.md
RocksDB: A Persistent Key-Value Store for Flash and RAM Storage
RocksDB is developed and maintained by Facebook Database Engineering Team. It is built on earlier work on LevelDB by Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com)
This code is a library that forms the core building block for a fast key-value server, especially suited for storing data on flash drives. It has a Log-Structured-Merge-Database (LSM) design with flexible tradeoffs between Write-Amplification-Factor (WAF), Read-Amplification-Factor (RAF) and Space-Amplification-Factor (SAF). It has multi-threaded compactions, making it especially suitable for storing multiple terabytes of data in a single database.
Start with example usage here: https://github.com/facebook/rocksdb/tree/master/examples
See the github wiki for more explanation.
The public interface is in include/. Callers should not include or
rely on the details of any other header files in this package. Those
internal APIs may be changed without warning.
Design discussions are conducted in https://www.facebook.com/groups/rocksdb.dev/
License
RocksDB is dual-licensed under both the GPLv2 (found in the COPYING file in the root directory) and Apache 2.0 License (found in the LICENSE.Apache file in the root directory). You may select, at your option, one of the above-listed licenses.