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