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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 Fri, 26 May 2017 16:37:04 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16026477#comment-16026477
] 

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

Github user rchallapalli commented on the issue:

    https://github.com/apache/drill/pull/822
  
    And based on my initial testing, I observed that the hash-agg is only using half of the
memory allocated. Since the planner by default uses a 2-phase agg, the memory computation
logic divides the allocated memory between the 2 hash-agg operators in the plan. This is grossly
in-efficient. And every test written would need to be modified once this issue gets resolved.
Hence I would push for a fix sooner than later


> 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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