Di Li commented on AMBARI-18588:

pushed to branch-2.5 as 

> Ambari server should not crash with NPE when parsing HTTP response for YARN 
> RM properties
> -----------------------------------------------------------------------------------------
>                 Key: AMBARI-18588
>                 URL: https://issues.apache.org/jira/browse/AMBARI-18588
>             Project: Ambari
>          Issue Type: Bug
>          Components: ambari-server
>    Affects Versions: trunk
>            Reporter: Di Li
>            Assignee: Di Li
>             Fix For: trunk
>         Attachments: AMBARI-18588.patch, AMBARI-18588_v2.patch
> When YARN RM HTTP response is a 404, the response body is empty and this 
> results in an empty responseMap, that later caused Ambari server to crash 
> with NPE when it tries to read properties from the responseMap.
> This JIRA proposes to set property values as null when the responseMap is 
> null (due to empty body passed back from the YARN web server side).

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