Jun Gong created YARN-3809:
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Summary: Failed to launch new attempts because
ApplicationMasterLauncher's threads all hang
Key: YARN-3809
URL: https://issues.apache.org/jira/browse/YARN-3809
Project: Hadoop YARN
Issue Type: Improvement
Components: resourcemanager
Reporter: Jun Gong
Assignee: Jun Gong
ApplicationMasterLauncher create a thread pool whose size is 10 to deal with
AMLauncherEventType(LAUNCH and CLEANUP).
In our cluster, there was many NM with 10+ AM running on it, and one shut down
for some reason. After RM found the NM LOST, it cleaned up AMs running on it.
Then ApplicationMasterLauncher need handle these 10+ CLEANUP event.
ApplicationMasterLauncher's thread pool would be filled up, and they all hang
in the code containerMgrProxy.stopContainers(stopRequest) because NM was down,
the default RPC time out is 15 mins. It means that in 15 mins
ApplicationMasterLauncher could not handle new event such as LAUNCH, then new
attempts will fails to launch because of time out.
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