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From "Dmytro Molkov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1349) Do not pull counters of non initialized jobs
Date Wed, 19 May 2010 03:47:54 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12868977#action_12868977
] 

Dmytro Molkov commented on HIVE-1349:
-------------------------------------

Thanks Paul, I just reached the same conclusion looking at shims.
Will try to get patch ready again soon.

> Do not pull counters of non initialized jobs
> --------------------------------------------
>
>                 Key: HIVE-1349
>                 URL: https://issues.apache.org/jira/browse/HIVE-1349
>             Project: Hadoop Hive
>          Issue Type: Improvement
>            Reporter: Dmytro Molkov
>         Attachments: HIVE-1349.2.patch, HIVE-1349.patch
>
>
> Right now hive client puts a lot of pressure on the jobtracker by pulling the counters
of the job that has just been submitted and is in the process of initializing tasks.
> While the job initialized tasks and reads the splits file it is holding the JobInProgress
lock. The getCounters method acquires a JobTracker lock and waits for the JobInProgress lock.
Since the read of the file can  take a couple (a couple of tens of seconds) the job tracker
is effectively blocked for that period of time.

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