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