[jira] [Resolved] (ARROW-7216) [Java] Improve the performance of setting/clearing individual bits

["Micah Kornfield (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-7216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Micah Kornfield resolved ARROW-7216.
------------------------------------
    Fix Version/s: 1.0.0
       Resolution: Fixed

Issue resolved by pull request 5872
[https://github.com/apache/arrow/pull/5872]

> [Java] Improve the performance of setting/clearing individual bits
> ------------------------------------------------------------------
>
>                 Key: ARROW-7216
>                 URL: https://issues.apache.org/jira/browse/ARROW-7216
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Java
>            Reporter: Liya Fan
>            Assignee: Liya Fan
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.0.0
>
>          Time Spent: 2h 50m
>  Remaining Estimate: 0h
>
> Setting/clearing individual bits are key operations for Arrow. In this issue, we improve the performance these operations by:
> 1. replacing arithmetic operations with bit-wise operations
> 2. remove unnecessary casts between int/byte
> 3. provide new API to remove the if branch
> Benchmark results show that for clearing a bit, the performance improve by 11%, and for general set/clear operation, the performance improve by 4.7%:
> before:
> BitVectorHelperBenchmarks.setValidityBitBenchmark        avgt    5  4.524 ± 0.015  us/op
> after:
> BitVectorHelperBenchmarks.setValidityBitBenchmark        avgt    5  4.313 ± 0.011  us/op
> BitVectorHelperBenchmarks.setValidityBitToZeroBenchmark  avgt    5  4.020 ± 0.016  us/op



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