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From "Paul Rogers (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (DRILL-5163) External sort on Mac creates a separate child process per spill via HDFS FS
Date Thu, 22 Jun 2017 05:23:00 GMT

     [ https://issues.apache.org/jira/browse/DRILL-5163?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Paul Rogers resolved DRILL-5163.
       Resolution: Fixed
    Fix Version/s: 1.11.0

Fixed as part of DRILL-5325

> External sort on Mac creates a separate child process per spill via HDFS FS
> ---------------------------------------------------------------------------
>                 Key: DRILL-5163
>                 URL: https://issues.apache.org/jira/browse/DRILL-5163
>             Project: Apache Drill
>          Issue Type: Improvement
>    Affects Versions: 1.8.0
>            Reporter: Paul Rogers
>            Assignee: Paul Rogers
>            Priority: Minor
>             Fix For: 1.11.0
> The external sort operator spills to disk. Spill files are created and written using
the HDFS file system. For performance, HDFS uses native libraries to access the file system.
These native libraries are not available on the Mac. As a result, some operations are implemented
using a shower, Java-only path. One of these operations (need details) is implemented by forking
a child process.
> When run in a debugger on the Mac, the behavior shows up as the furious creation and
deletion of threads to manage the child processes: one per spill. Because of this behavior,
performance of external sort is slow. Of course, no production code uses Drill on a Mac, so
this is more of a nuisance than a real bug, which is why it is marked as an improvement.

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