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Posted to issues-all@impala.apache.org by "Michael Ho (JIRA)" <ji...@apache.org> on 2018/10/05 18:32:00 UTC
[jira] [Comment Edited] (IMPALA-6741) Profiles of running queries
should tell last update time of counters
[ https://issues.apache.org/jira/browse/IMPALA-6741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16640193#comment-16640193 ]
Michael Ho edited comment on IMPALA-6741 at 10/5/18 6:31 PM:
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[~jeszyb], do you think a recording the elapsed time since the last update is a reasonable solution ? We can add the warning as part of IMPALA-2990 but for the purpose of diagnostics, having the elapsed time since the last update may already be quite useful for identifying stuck fragment instances. Also, backporting it should be pretty straightforward.
was (Author: kwho):
[~jeszyb], do you think a recording the elapsed time since the last update is a reasonable solution ? We can add the warning as part of IMPALA-2990 but for the purpose of diagnostics, having the elapsed time since the last update may already be quite useful for identifying stuck fragment instances.
> Profiles of running queries should tell last update time of counters
> --------------------------------------------------------------------
>
> Key: IMPALA-6741
> URL: https://issues.apache.org/jira/browse/IMPALA-6741
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Reporter: Balazs Jeszenszky
> Assignee: Michael Ho
> Priority: Major
>
> When looking at the profile of a running query, it's impossible to tell the degree of accuracy. We've seen issues both with instances not checking in with the coordinator for a long time, and with hung instances that never update their counters. There are some specific issues as well, see IMPALA-5200. This means that profiles taken off of running queries can't be used perf troubleshooting with confidence.
> Ideally, Impala should guarantee counters to be written at a certain interval, and warn for counters or instances that are out of sync for some reason.
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