Earlier there was a check in startContainer which was validating that RemoteUGI.getRemoteUser is same as containerId. However this check is no longer required and it should be removed. YARN-699 and YARN-715 will get fixed with this.
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blocks
YARN-699TestUnmanagedAMLauncher fails with: Unauthorized request to start container
Resolved
YARN-715TestDistributedShell and TestUnmanagedAMLauncher are failing
Closed
is related to
YARN-613Create NM proxy per NM instead of per container