Revision bb23bfe63c4f19919ddad10e5f7027eb09f17ef0 authored by sdong on 13 November 2019, 18:10:09 UTC, committed by Facebook Github Bot on 13 November 2019, 18:11:34 UTC
Summary:
Recent change https://github.com/facebook/rocksdb/pull/5861 mistakely use "prefix_extractor_ != nullptr" as the condition to determine whehter prefix bloom filter isused. It fails to consider read_options.total_order_seek, so it is wrong. The result is that an optimization for non-total-order seek is mistakely applied to total order seek, and introduces a bug in following corner case:
Because of RangeDelete(), a file's largest key is extended. Seek key falls into the range deleted file, so level iterator seeks into the previous file without getting any key. The correct behavior is to place the iterator to the first key of the next file. However, an optimization is triggered and invalidates the iterator because it is out of the prefix range, causing wrong results. This behavior is reproduced in the unit test added.
Fix the bug by setting prefix_extractor to be null if total order seek is used.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6028

Test Plan: Add a unit test which fails without the fix.

Differential Revision: D18479063

fbshipit-source-id: ac075f013029fcf69eb3a598f14c98cce3e810b3
1 parent 42b5494
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