[jira] [Commented] (DRILL-5517) Provide size-aware set operations in value vectors

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-5517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16072859#comment-16072859 ] 

ASF GitHub Bot commented on DRILL-5517:
---------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/drill/pull/840


> 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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