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https://reviews.apache.org/r/50756/
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Review request for Ambari, Alejandro Fernandez, Jonathan Hurley, and Nate Cole.


Bugs: AMBARI-18008
    https://issues.apache.org/jira/browse/AMBARI-18008


Repository: ambari


Description
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RU Downgrade failure while downgrading from 2.5 to 2.3. Downgrade failed at the 
step
' Client Components' ----> ' Updating configuration 
sqoop-atlas-application.properties'.


1) Install HDP-2.3.2.0-2950 with ambari-server-2.1.2-377
2) upgrade ambari to 2.4.0.0-1054
3) Start stack upgrade to erie.
4) Before finalize step, start the downgrade.
The downgrade is failing at above mentioned step.

{code}
02 Aug 2016 05:27:58,527  WARN [Server Action Executor Worker 4525] 
ServerActionExecutor:497 - Task #4525 failed to complete execution due to 
thrown exception: java.lang.NullPointerException:null
java.lang.NullPointerException
at 
org.apache.ambari.server.serveraction.upgrades.ConfigureAction.execute(ConfigureAction.java:239)
at 
org.apache.ambari.server.serveraction.ServerActionExecutor$Worker.execute(ServerActionExecutor.java:555)
at 
org.apache.ambari.server.serveraction.ServerActionExecutor$Worker.run(ServerActionExecutor.java:492)
at java.lang.Thread.run(Thread.java:745){code}


Diffs
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ambari-server/src/main/java/org/apache/ambari/server/serveraction/upgrades/ConfigureAction.java
 ab6614d 
  ambari-server/src/main/resources/stacks/HDP/2.3/upgrades/upgrade-2.5.xml 
6390f1f 
  ambari-server/src/main/resources/stacks/HDP/2.4/upgrades/upgrade-2.5.xml 
e7bf162 

Diff: https://reviews.apache.org/r/50756/diff/


Testing
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on live cluster


Thanks,

Dmitro Lisnichenko

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