[jira] [Resolved] (ARROW-13147) [Java] Respect the rounding policy when allocating vector buffers

["Liya Fan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-13147?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Liya Fan resolved ARROW-13147.
------------------------------
    Fix Version/s: 5.0.0
       Resolution: Fixed

Issue resolved by pull request 10576
[https://github.com/apache/arrow/pull/10576]

> [Java] Respect the rounding policy when allocating vector buffers
> -----------------------------------------------------------------
>
>                 Key: ARROW-13147
>                 URL: https://issues.apache.org/jira/browse/ARROW-13147
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Java
>            Reporter: Liya Fan
>            Assignee: Liya Fan
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 5.0.0
>
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> According to the current implementation, the default "next power of two" rounding policy is assumed when allocating buffers for a vector. 
> In particular, for fixed width vectors, this policy is applied for the validity and data buffers, and for variable width vectors, this policy is applied for the validity and offset buffers. 
> However, this default policy is not always used for the allocator. When an alternative policy is in use, the buffers allocated assuming the default policy will have inappropriate capacities, which may lead to waste of memory spaces. 



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