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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-5457) Support Spill to Disk for the Hash Aggregate Operator
Date Wed, 24 May 2017 03:15:05 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16022254#comment-16022254
] 

ASF GitHub Bot commented on DRILL-5457:
---------------------------------------

Github user Ben-Zvi commented on a diff in the pull request:

    https://github.com/apache/drill/pull/822#discussion_r118154367
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/record/RecordBatch.java ---
    @@ -188,6 +188,18 @@
         NOT_YET,
     
         /**
    +     * Restart reading incoming batches.
    +     * <p>
    +     *     Prior calls to {@link #next()} returned data after all incoming batches were
processed.
    +     *     But with this status, need to restart reading incoming RecordBatches.
    +     * </p>
    +     * <p>
    +     *     Currently only used internally by the Hash Aggregate.
    +     * </p>
    +     */
    --- End diff --
    
    The whole iterator driven next() model is very limiting. This change was the simplest
- re-invoking the next next() so that spilled partitions could be processed from then on.

    Trying to switch without returning from the next() first seems too complex.  


> Support Spill to Disk for the Hash Aggregate Operator
> -----------------------------------------------------
>
>                 Key: DRILL-5457
>                 URL: https://issues.apache.org/jira/browse/DRILL-5457
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Execution - Relational Operators
>    Affects Versions: 1.10.0
>            Reporter: Boaz Ben-Zvi
>            Assignee: Boaz Ben-Zvi
>             Fix For: 1.11.0
>
>
> Support gradual spilling memory to disk as the available memory gets too small to allow
in memory work for the Hash Aggregate Operator.



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