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https://issues.apache.org/jira/browse/AMBARI-18588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15582436#comment-15582436
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Di Li commented on AMBARI-18588:
--------------------------------

pushed to trunk as 
https://git-wip-us.apache.org/repos/asf?p=ambari.git;a=commit;h=73f1dea9674359ecbfd723917c83913b20986906

> 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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