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https://issues.apache.org/jira/browse/YARN-808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13955438#comment-13955438
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Bikas Saha commented on YARN-808:
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We should atleast change the app report response to include invalid value of
host and port in the response when there host and port are not ready. Currently
we return a value of "N/A" for host which is confusing since the non-null
string could be a valid host. We should return null for host and some -ve
number for the port.
> ApplicationReport does not clearly tell that the attempt is running or not
> --------------------------------------------------------------------------
>
> Key: YARN-808
> URL: https://issues.apache.org/jira/browse/YARN-808
> Project: Hadoop YARN
> Issue Type: Bug
> Affects Versions: 2.1.0-beta
> Reporter: Bikas Saha
> Assignee: Xuan Gong
> Attachments: YARN-808.1.patch
>
>
> When an app attempt fails and is being retried, ApplicationReport immediately
> gives the new attemptId and non-null values of host etc. There is no way for
> clients to know that the attempt is running other than connecting to it and
> timing out on invalid host. Solution would be to expose the attempt state or
> return a null value for host instead of "N/A"
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