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Posted to common-dev@hadoop.apache.org by "Hudson (JIRA)" <ji...@apache.org> on 2008/08/22 14:34:50 UTC
[jira] Commented: (HADOOP-3864) JobTracker lockup due to
JobInProgress.initTasks taking significant time for large jobs on large
clusters
[ https://issues.apache.org/jira/browse/HADOOP-3864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12624748#action_12624748 ]
Hudson commented on HADOOP-3864:
--------------------------------
Integrated in Hadoop-trunk #581 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-trunk/581/])
> JobTracker lockup due to JobInProgress.initTasks taking significant time for large jobs on large clusters
> ---------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-3864
> URL: https://issues.apache.org/jira/browse/HADOOP-3864
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.18.0
> Reporter: Arun C Murthy
> Assignee: Arun C Murthy
> Priority: Critical
> Fix For: 0.19.0
>
> Attachments: HADOOP-3864_0_20080830.patch
>
>
> JobInProgress.initTasks takes significant amount of time on a large cluster for large jobs (55k maps * 3 splits), during which the JobInProgress object is locked up.
> Simultaneously the JobClient is calling JobTracker.getTaskCompletionEvents which locks the JobTracker & tries to lock the JobInProgress, there-by it starves all heartbeats which are trying to lock the JobTracker - resulting in a lockup.
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