Junping Du created YARN-5748:

             Summary: Backport YARN-5718 to branch-2
                 Key: YARN-5748
                 URL: https://issues.apache.org/jira/browse/YARN-5748
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Junping Du
            Assignee: Junping Du

In YARN-5718, we have identify several unnecessary config to over-write HDFS 
client behavior in several components of YARN (FSRMStore, TimelineClient, 
NodeLabelStore, etc.) which cause job failure in some cases (NN HA, etc.) - 
that's definitely belongs to bug. In YARN-5718, we proposed to remove the 
config as it shouldn't be supposed to work, which get committed to trunk 
already as alpha stage has more flexibility for incompatible changes. In 
branch-2, we want to play a bit more safe and get more discussion. 
Obviously, there are several options here:
1. Don't fix anything, let bug exist
2. Fix the bug, but keep the configuration, or mark it deprecated and add some 
explanation to say this configuration is not supposed to work any more.
3. Exactly like YARN-5718, fix the bug and remove the unnecessary configuration.
This ticket is filed for more discussion.

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