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https://issues.apache.org/jira/browse/DRILL-5517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16065681#comment-16065681
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ASF GitHub Bot commented on DRILL-5517:
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Github user paul-rogers commented on the issue:
https://github.com/apache/drill/pull/840
Reran pre-commit tests. One unit test fails, but in an area untouched by
this commit. Indeed, this appears to be a random failure as the very same tests
passes on my Mac and on my Linux development VM. See DRILL-5612.
> Provide size-aware set operations in value vectors
> --------------------------------------------------
>
> Key: DRILL-5517
> URL: https://issues.apache.org/jira/browse/DRILL-5517
> Project: Apache Drill
> Issue Type: Improvement
> Affects Versions: 1.11.0
> Reporter: Paul Rogers
> Assignee: Paul Rogers
> Labels: ready-to-commit
> Fix For: 1.11.0
>
>
> DRILL-5211 describes a memory fragmentation issue in Drill. The resolution is
> to limit vector sizes to 16 MB (the size of Netty memory allocation "slabs.")
> Effort starts by providing "size-aware" set operations in value vectors which:
> * Operate as {{setSafe()}} while vectors are below 16 MB.
> * Throw a new, specific exception ({{VectorOverflowException}}) if setting
> the value (and growing the vector) would exceed the vector limit.
> The methods in value vectors then become the foundation on which we can
> construct size-aware record batch "writers."
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