Review Request 61000: AMBARI-21527 Restart of MR2 History Server failed due to wrong NameNode RPC address

[Di Li <di...@ca.ibm.com>]

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Review request for Ambari, Attila Doroszlai, Alejandro Fernandez, Jonathan Hurley, and Tim Thorpe.


Bugs: AMBARI-21527
    https://issues.apache.org/jira/browse/AMBARI-21527


Repository: ambari


Description
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dfs.namenode.rpc-address gets merged in during EU with default value "localhost:8020". Both the host and port could be wrong and cause issues during HDFS restart. NN restart for kerberos cluster and remote DN restart for non secured cluster. 

This is because HDFS Py script looks for that property first and uses it if it exists. This logic and the fact that the property (seems unnecessarily) merged in during EU with "localhost:8020" as the value was what caused the issues in our tests.


Diffs
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  ambari-server/src/main/resources/stacks/BigInsights/4.2.5/upgrades/config-upgrade.xml e476d57 
  ambari-server/src/main/resources/stacks/BigInsights/4.2.5/upgrades/nonrolling-upgrade-to-hdp-2.6.xml cbd0550 
  ambari-server/src/main/resources/stacks/BigInsights/4.2/upgrades/config-upgrade.xml dada6e2 
  ambari-server/src/main/resources/stacks/BigInsights/4.2/upgrades/nonrolling-upgrade-to-hdp-2.6.xml 3ea20ed 


Diff: https://reviews.apache.org/r/61000/diff/1/


Testing
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tested as part of the EU


Thanks,

Di Li