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From "Eugene Koifman (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-17341) DbTxnManger.startHeartbeat() - randomize initial delay
Date Fri, 25 Aug 2017 15:08:02 GMT

    [ https://issues.apache.org/jira/browse/HIVE-17341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16141741#comment-16141741
] 

Eugene Koifman commented on HIVE-17341:
---------------------------------------

no related failures

> DbTxnManger.startHeartbeat() - randomize initial delay
> ------------------------------------------------------
>
>                 Key: HIVE-17341
>                 URL: https://issues.apache.org/jira/browse/HIVE-17341
>             Project: Hive
>          Issue Type: Improvement
>          Components: Transactions
>            Reporter: Eugene Koifman
>            Assignee: Eugene Koifman
>         Attachments: HIVE-17341.01.patch
>
>
> This sets up a fixed delay for all heartebeats.  If many queries land on the server at
the same time,
> they will wake up and start hearbeating at the same time causing a bottleneck.
> Add some random element to heatbeat delay.



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