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From "Subroto Sanyal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2990) Health Report on Resource Manager UI is null if the NM's are all healthy.
Date Fri, 23 Sep 2011 07:14:26 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13113207#comment-13113207

Subroto Sanyal commented on MAPREDUCE-2990:

One more point to check here is:

        setHealthStatus(true, "", now);

The API has following documentation snippet:
     * If the script throws {@link IOException} or {@link ExitCodeException} the
     * output is ignored and node is left remaining healthy, as script might
     * have syntax error.

If this is the case, then user may not come to about the problem in script.
In my opinion the node health should be reported as unhealthy; which will attract the attention
of the Script Developer/User

> Health Report on Resource Manager UI is null if the NM's are all healthy.
> -------------------------------------------------------------------------
>                 Key: MAPREDUCE-2990
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2990
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mrv2
>    Affects Versions: 0.23.0
>            Reporter: Mahadev konar
>            Priority: Blocker
>              Labels: newbie
>             Fix For: 0.23.0
>         Attachments: MAPREDUCE-2990(1).patch
> The web UI on the RM for the link Nodes shows that Health-report as null when the NM
is healthy. 
> This is a simple fix where in we can check for null in NodesPage.java and put something
meaningful instead of null.
> NodesPage.java:
> {code}
> render(..)
> td((health.getHealthReport() == null) ?"REPORT HEALTHY": health.getHealthReport());
> {code}
> Or something like that.

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