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From "Rajesh Balamohan (Jira)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-23210) Fix shortestjobcomparator when jobs submitted have 1 task their vertices
Date Wed, 15 Apr 2020 07:38:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-23210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17083880#comment-17083880
] 

Rajesh Balamohan commented on HIVE-23210:
-----------------------------------------

TestShortestJobFirstComparator::testWaitQueueAging should reproduce the issue. In some cases,
tasks which got submitted initially gets picked up at the last.

> Fix shortestjobcomparator when jobs submitted have 1 task their vertices
> ------------------------------------------------------------------------
>
>                 Key: HIVE-23210
>                 URL: https://issues.apache.org/jira/browse/HIVE-23210
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Rajesh Balamohan
>            Priority: Major
>         Attachments: TestShortestJobFirstComparator.java
>
>
> In latency sensitive queries, lots of jobs can have vertices with 1 task. Currently shortestjobcomparator
does not work correctly and returns tasks in random order.
> [https://github.com/apache/hive/blob/master/llap-server/src/java/org/apache/hadoop/hive/llap/daemon/impl/comparator/ShortestJobFirstComparator.java#L51]
> This causes delay in the job runtime. I will attach a simple test case shortly.



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