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Date: Wed, 17 May 2017 21:01:06 +0000 (UTC)
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Subject: [jira] [Commented] (DRILL-5457) Support Spill to Disk for the Hash
 Aggregate Operator
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archived-at: Wed, 17 May 2017 21:01:13 -0000


    [ https://issues.apache.org/jira/browse/DRILL-5457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16014763#comment-16014763 ] 

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

Github user paul-rogers commented on a diff in the pull request:

    https://github.com/apache/drill/pull/822#discussion_r117106477
  
    --- 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 --
    
    Not entirely sure we want to extend the core Volcano iterator protocol to help with a single operator. In general, ALL operators should be prepared to handle this value since it is part of the public protocol.
    
    Can we find a way to avoid this? I suspect some code restructuring, along with an operator-specific enum, would do the trick.


> 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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