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https://reviews.apache.org/r/36949/
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Review request for Ambari, Jonathan Hurley, Mahadev Konar, Myroslav 
Papirkovskyy, and Sumit Mohanty.


Bugs: AMBARI-12595
    https://issues.apache.org/jira/browse/AMBARI-12595


Repository: ambari


Description
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This patch resolves AMBARI-12595.  

In large-scale clusters, there are some intermittent failures in Blueprint 
deployments that occur due to un-resolved configuration.  The Blueprints 
processor should refresh the configuration on each ExecutionCommand instance, 
prior to sending these commands to nodes in the cluster.  

This patch implements the following:

1. Adds an overloaded method to ExecutionCommandWrapper to handle the 
Blueprints-specific case where an ExecutionCommand should always refresh the 
configuration fully before further processing continues. 
2. Modifies the AmbariManagementControllerImpl.createHostAction() method to 
detect the case of a Blueprints deployment, and to call the new overloaded 
method in ExecutionCommandWrapper to ensure that the configuration for this 
command is fully refreshed.


Diffs
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ambari-server/src/main/java/org/apache/ambari/server/actionmanager/ExecutionCommandWrapper.java
 a775452 
  
ambari-server/src/main/java/org/apache/ambari/server/controller/AmbariManagementControllerImpl.java
 1f4e7cd 

Diff: https://reviews.apache.org/r/36949/diff/


Testing
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1. Deployed a 3-node HDFS HA cluster with this patch applied, and verified that 
the cluster was installed and started properly. 
2. Prior to merging this patch, I will run the full ambari-server unit test 
suite, and verify that it passes.


Thanks,

Robert Nettleton

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