229640f88d
Summary: In final polishing of https://github.com/facebook/rocksdb/issues/8297 (after most manual testing), I broke my own caching layer by sanitizing an input parameter with std::min(0, x) instead of std::max(0, x). I resisted unit testing the timing part of the result caching because historically, these test are either flaky or difficult to write, and this was not a correctness issue. This bug is essentially unnoticeable with a small number of column families but can explode background work with a large number of column families. This change fixes the logical error, removes some unnecessary related optimization, and adds mock time/sleeps to the unit test to ensure we can cache hit within the age limit. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8369 Test Plan: added time testing logic to existing unit test Reviewed By: ajkr Differential Revision: D28950892 Pulled By: pdillinger fbshipit-source-id: e79cd4ff3eec68fd0119d994f1ed468c38026c3b
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/ and https://rocksdb.slack.com/
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.