[jira] [Resolved] (ARROW-7019) [Java] Improve the performance of loading validity buffers

["Neal Richardson (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-7019?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Neal Richardson resolved ARROW-7019.
------------------------------------
    Fix Version/s: 1.0.0
       Resolution: Fixed

Issue resolved by pull request 5751
[https://github.com/apache/arrow/pull/5751]

> [Java] Improve the performance of loading validity buffers
> ----------------------------------------------------------
>
>                 Key: ARROW-7019
>                 URL: https://issues.apache.org/jira/browse/ARROW-7019
>             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: 1h 10m
>  Remaining Estimate: 0h
>
> At the receiver side of flighting, loading validity buffer is an important operation, as each vector has a validity buffer. 
> For non-nullable vectors, the current implementation of loading the validity buffer is inefficient.  We improve the performance of this operation by efficiently setting the bits of a memory region to 1. 
> Benchmark results show that the changes leads to a 35% performance improvement:
> Before:
> BitVectorHelperBenchmarks.loadValidityBufferAllOne  avgt    5  748.916 ± 23.290  ns/op
> After:
> BitVectorHelperBenchmarks.loadValidityBufferAllOne  avgt    5  487.352 ± 15.046  ns/op



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