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rocksdb/unreleased_history/bug_fixes/opt_seek.md
akankshamahajan ed5b6c0d99 Avoid alignment in FilePrefetchBuffer during seek with async_io (#11793) 
Summary:
During Seek, the iterator seeks every file on L0. In async_io, it submit the requests to seek on every file on L0 asynchronously using RocksDB FilePrefetchBuffer.
However, FilePrefetchBuffer does alignment and reads extra bytes then needed that can increase the throughput.
In case of non direct io, the alignment can be avoided.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/11793

Test Plan:
- Added a unit test that fails without this PR.
- make crash_test -j32 completed successfully

Reviewed By: anand1976

Differential Revision: D48985051

Pulled By: akankshamahajan15

fbshipit-source-id: 2d130a9e7c3df9c4fcd0408406e6277ab75a4389
2023-09-11 11:41:44 -07:00

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Raw Blame History

Add a fix for async_io where during seek, when reading a block for seeking a target key in a file without any readahead, the iterator aligned the read on a page boundary and reading more than necessary. This increased the storage read bandwidth usage.