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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 Fri, 30 Jun 2017 03:32:00 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16069417#comment-16069417
] 

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

Github user amansinha100 commented on the issue:

    https://github.com/apache/drill/pull/840
  
    Minor followup comment.   LGTM.  +1


> 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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