[jira] [Created] (AMBARI-7835) Blueprints exports fail after an upgrade from Ambari 1.6 to 1.7.0

["Robert Nettleton (JIRA)" <ji...@apache.org>]

Robert Nettleton created AMBARI-7835:
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             Summary: Blueprints exports fail after an upgrade from Ambari 1.6 to 1.7.0
                 Key: AMBARI-7835
                 URL: https://issues.apache.org/jira/browse/AMBARI-7835
             Project: Ambari
          Issue Type: Bug
          Components: ambari-server
    Affects Versions: 1.7.0
            Reporter: Robert Nettleton
            Assignee: Robert Nettleton
             Fix For: 1.7.0


Exporting a Blueprint from a running cluster after an upgrade from Ambari 1.6 to 1.7.0 currently fails.  

The REST API reports a server failure, and the ambari-server.log indicates that a NullPointerException occurs:

java.lang.NullPointerException
	at org.apache.ambari.server.api.query.render.ClusterBlueprintRenderer$Configuration.stripRequiredProperties(ClusterBlueprintRenderer.java:594)
	at org.apache.ambari.server.api.query.render.ClusterBlueprintRenderer$Configuration.<init>(ClusterBlueprintRenderer.java:541)
	at org.apache.ambari.server.api.query.render.ClusterBlueprintRenderer.processConfigurations(ClusterBlueprintRenderer.java:210)
	at org.apache.ambari.server.api.query.render.ClusterBlueprintRenderer.createBlueprintResource(ClusterBlueprintRenderer.java:158)
	at org.apache.ambari.server.api.query.render.ClusterBlueprintRenderer.finalizeResult(ClusterBlueprintRenderer.java:120)
	at org.apache.ambari.server.api.query.QueryImpl.getResult(QueryImpl.java:731)
	at org.apache.ambari.server.api.query.QueryImpl.execute(QueryImpl.java:197)
	at org.apache.ambari.server.api.handlers.ReadHandler.handleRequest(ReadHandler.java:68)
	at org.apache.ambari.server.api.services.BaseRequest.process(BaseRequest.java:135)
	at org.apache.ambari.server.api.services.BaseService.handleRequest(BaseService.java:103)
	at org.apache.ambari.server.api.services.BaseService.handleRequest(BaseService.java:72)
	at org.apache.ambari.server.api.services.ClusterService.getCluster(ClusterService.java:81)


This exception only seems to occur in the following scenario:

1. Install Ambari 1.6
2. Start an HDP cluster (2.1, others may also cause this) using the Ambari UI. 
3. Upgrade Ambari to v1.7.0. 
4. Attempt to export a Blueprint based on the cluster, and this will cause the exception.

The Blueprint configuration processor is currently failing to process certain "emtpy" configuration elements that the Ambari UI adds in Ambari 1.6 but does not add in newer versions of the code.  

The Blueprint configuration processor should be updated to handle empty configuration groups, which are valid in Ambari.  

I'm working on a fix for this, and will be submitting a patch shortly. 




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