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https://reviews.apache.org/r/48670/
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Review request for Ambari, Alejandro Fernandez, Jayush Luniya, and Sumit 
Mohanty.


Bugs: AMBARI-17210
    https://issues.apache.org/jira/browse/AMBARI-17210


Repository: ambari


Description
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Return well formatted error response while deleting host with clients installed.


Diffs
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ambari-server/src/main/java/org/apache/ambari/server/controller/internal/HostResourceProvider.java
 46fc65295f72bae39c534cd9684f2d76d1e30224 

Diff: https://reviews.apache.org/r/48670/diff/


Testing
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Manual testing

delete 
http://c6401.ambari.apache.org:8080/api/v1/clusters/c1/hosts/c6403.ambari.apache.org
{
  "status" : 500,
  "message" : "org.apache.ambari.server.controller.spi.SystemException: An 
internal system exception occurred: Cannot remove host c6403.ambari.apache.org 
from c1.  The following roles exist, and these components must be stopped if 
running, and then deleted: HDFS_CLIENT, MAPREDUCE2_CLIENT, YARN_CLIENT, 
ZOOKEEPER_CLIENT"
}


Thanks,

Ajit Kumar

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