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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-5601) Rollup of External Sort memory management fixes
Date Wed, 19 Jul 2017 18:00:01 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16093503#comment-16093503
] 

ASF GitHub Bot commented on DRILL-5601:
---------------------------------------

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

    https://github.com/apache/drill/pull/860#discussion_r128128116
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/spill/SpillSet.java
---
    @@ -413,7 +419,12 @@ public SpillSet(DrillConfig config, FragmentHandle handle, PhysicalOperator
popC
           fileManager = new HadoopFileManager(spillFs);
         }
     
    -    spillDirName = String.format("%s_%s_%s-%s_minor%s", QueryIdHelper.getQueryId(handle.getQueryId()),
    +    // If provided with a prefix to identify the Drillbit, prepend that to the
    +    // spill directory.
    +
    +    spillDirName = String.format("%s%s_%s_%s-%s-%s",
    +        ep == null ? "" : ep.getAddress() + "-" + ep.getUserPort() + "/",
    --- End diff --
    
    Will never be empty in production. Test code is required to provide a suitable value.
Still, added an assert to ensure that this is true.


> Rollup of External Sort memory management fixes
> -----------------------------------------------
>
>                 Key: DRILL-5601
>                 URL: https://issues.apache.org/jira/browse/DRILL-5601
>             Project: Apache Drill
>          Issue Type: Task
>    Affects Versions: 1.11.0
>            Reporter: Paul Rogers
>            Assignee: Paul Rogers
>             Fix For: 1.12.0
>
>
> Rollup of a set of specific JIRA entries that all relate to the very difficult problem
of managing memory within Drill in order for the external sort to stay within a memory budget.
In general, the fixes relate to better estimating memory used by the three ways that Drill
allocates vector memory (see DRILL-5522) and to predicting the size of vectors that the sort
will create, to avoid repeated realloc-copy cycles (see DRILL-5594).



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