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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-5517) Provide size-aware set operations in value vectors
Date Mon, 03 Jul 2017 19:51:00 GMT

    [ 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:


> 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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