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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. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: mapreduce-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: mapreduce-issues-h...@hadoop.apache.org