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https://reviews.apache.org/r/30813/
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Review request for Ambari, Dmitro Lisnichenko, Jonathan Hurley, Nate Cole, Tom 
Beerbower, and Yurii Shylov.


Bugs: AMBARI-9541
    https://issues.apache.org/jira/browse/AMBARI-9541


Repository: ambari


Description
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Rolling Upgrade down grade is the same as the upgrade, with the exception that 
the "hdfs dfsadmin -rollingUpgrade prepare" command does not need to be ran.


Diffs
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ambari-server/src/main/resources/common-services/HDFS/2.1.0.2.0/package/scripts/namenode_upgrade.py
 f74d874 
  
ambari-server/src/main/resources/common-services/HDFS/2.1.0.2.0/package/scripts/params.py
 69cd157 
  
ambari-server/src/main/resources/common-services/HDFS/2.1.0.2.0/package/scripts/utils.py
 154e6e3 

Diff: https://reviews.apache.org/r/30813/diff/


Testing
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Deployed a 3-node cluster with NamenodeHA, and only HDFS and ZK, then caused a 
failure on Datanode, performed a downgrade, and it correctly got to Finalize.

Unit tests are in progress.


Thanks,

Alejandro Fernandez

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