Revision 2a0f3d0de12ddb0d538e2d221c682536acd885d1 authored by Aaron Gao on 21 February 2017, 18:11:04 UTC, committed by Facebook Github Bot on 21 February 2017, 18:24:17 UTC
Summary: reimplement the compaction expansion on lower level. Considering such a case: input level file: 1[B E] 2[F G] 3[H I] 4 [J M] output level file: 5[A C] 6[D K] 7[L O] If we initially pick file 2, now we will compact file 2 and 6. But we can safely compact 2, 3 and 6 without expanding the output level. The previous code is messy and wrong. In this diff, I first determine the input range [a, b], and output range [c, d], then we get the range [e,f] = [min(a, c), max(b, d] and put all eligible clean-cut files within [e, f] into this compaction. **Note: clean-cut means the files don't have the same user key on the boundaries of some files that are not chosen in this compaction**. Closes https://github.com/facebook/rocksdb/pull/1760 Differential Revision: D4395564 Pulled By: lightmark fbshipit-source-id: 2dc2c5c
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README.md
## RocksDB: A Persistent Key-Value Store for Flash and RAM Storage
[](https://travis-ci.org/facebook/rocksdb)
[](https://ci.appveyor.com/project/Facebook/rocksdb/branch/master)
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 specially 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](https://github.com/facebook/rocksdb/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/
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