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From "Thomas Graves (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3360) Provide information about lost nodes in the UI.
Date Tue, 10 Jan 2012 19:24:39 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13183497#comment-13183497

Thomas Graves commented on MAPREDUCE-3360:

If we change nodeHttpAddress to empty string in RMWebServices.java, then it conflicts with
the way we have been displaying it in the UI, as we have been displaying it as "N/A" for inactive
nodes. Or do we need to capture this behaviour some where in the documentation?

its ok for the webui to display something slightly different then the web services.  The UI
should be "pretty and appealing to users" where as the web services should be programmatic.
 In my opinion, the empty string would be more programmatic and the N/A more user appealing.
 I will make sure to document what empty fields mean in MAPREDUCE-3549.

After this change, if we provide true totalNodes info through web services, do we need to
provide the same info on the UI also?.
I don't have a strong opinion either way.  I guess it would be nice if ops or someone wanted
at quick glance to see total nodes to have it in the web ui.   My only concern would be if
it makes the page to wide.

In general, the web services should include everything the web ui does but I don't think it
strictly necessarily to have everything from web services in the web ui though. The main reason
I say to leave totalNodes in the webservices is because that field was already there and I
would like to stay away from removing fields unless we change the version number.    

> Provide information about lost nodes in the UI.
> -----------------------------------------------
>                 Key: MAPREDUCE-3360
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3360
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mrv2
>    Affects Versions: 0.23.0
>         Environment: NA
>            Reporter: Bhallamudi Venkata Siva Kamesh
>            Assignee: Bhallamudi Venkata Siva Kamesh
>            Priority: Critical
>         Attachments: LostNodes.png, MAPREDUCE-3360-1.patch, MAPREDUCE-3360-2.patch, MAPREDUCE-3360-3.patch,
MAPREDUCE-3360-4.patch, MAPREDUCE-3360-5.patch, MAPREDUCE-3360.patch, lostNodes.png
> Currently there is no information provided about *lost nodes*. Provide information in
the UI. 

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