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From László Bodor (Jira) <j...@apache.org>
Subject [jira] [Commented] (HIVE-23122) LLAP TaskExecutorService should log details about task eviction decision details
Date Wed, 01 Apr 2020 13:41:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-23122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17072783#comment-17072783
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László Bodor commented on HIVE-23122:
-------------------------------------

thanks for the comments [~pgaref], included canFinishForPriority
removing 01.patch for saving ptest time

> LLAP TaskExecutorService should log details about task eviction decision details
> --------------------------------------------------------------------------------
>
>                 Key: HIVE-23122
>                 URL: https://issues.apache.org/jira/browse/HIVE-23122
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: László Bodor
>            Assignee: László Bodor
>            Priority: Major
>         Attachments: HIVE-23122.02.patch
>
>
> TaskExecutorService maintains a waitQueue, and can evict a task in favor of another.
Under the hood, the queue uses a configurable [comparator|https://github.com/apache/hive/tree/master/llap-server/src/java/org/apache/hadoop/hive/llap/daemon/impl/comparator].
The currently available comparators typically use the following properties of a task(wrapper):
> getWithinDagPriority: related to vertex
> currentAttemptStartTime
> firstAttemptStartTime
> knownPending: remaining upstream tasks
> The problem is, when an eviction happens, the INFO level message doesn't provide any
insight about the decision, only attempts ids like below:
> {code}
> attempt_1585248378306_0010_72_02_000096_8 evicted from wait queue in favor of attempt_1585248378306_0003_175_02_000079_175
because of lower priority
> {code}



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