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Posted to mapreduce-issues@hadoop.apache.org by "Jason Lowe (JIRA)" <ji...@apache.org> on 2018/02/14 17:33:00 UTC
[jira] [Commented] (MAPREDUCE-7053) Timed out tasks can fail to
produce thread dump
[ https://issues.apache.org/jira/browse/MAPREDUCE-7053?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16364484#comment-16364484 ]
Jason Lowe commented on MAPREDUCE-7053:
---------------------------------------
This is triggered by MAPREDUCE-5124. Before MAPREDUCE-5124 tasks that were unknown were not rejected. After MAPREDUCE-5124 the AM started proactively rejecting unknown tasks and exposed this latent issue.
> Timed out tasks can fail to produce thread dump
> -----------------------------------------------
>
> Key: MAPREDUCE-7053
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7053
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 3.1.0, 3.0.1, 2.10.0, 2.9.1, 2.8.4, 2.7.6
> Reporter: Jason Lowe
> Priority: Major
>
> TestMRJobs#testThreadDumpOnTaskTimeout has been failing sporadically recently. When the AM times out a task it immediately removes it from the list of known tasks and then connects to the NM to request a thread dump followed by a kill. If the task heartbeats in after the task has been removed from the list of known tasks but before the thread dump signal arrives then the task can exit with a "org.apache.hadoop.mapred.Task: Parent died." message and no thread dump.
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