[MAPREDUCE-7053] Timed out tasks can fail to produce thread dump

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.1.0, 3.0.1, 2.10.0, 2.9.1, 2.8.4
• Fix Version/s: 3.1.0, 2.10.0, 2.9.1, 2.8.4, 3.0.3
• Target Version/s: 3.1.0, 3.0.1, 2.10.0, 2.9.1, 2.8.4
• Assignee: Jason Darrell Lowe
• Reporter: Jason Darrell Lowe
• Created: 14/Feb/18 17:25
• Updated: 14/Oct/19 15:38
• Resolved: 16/Feb/18 15:19

Description

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.

Issue Links

• is broken by: MAPREDUCE-5124 AM lacks flow control for task events