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Date: Mon, 5 Dec 2011 05:03:39 +0000 (UTC)
From: "Devaraj K (Commented) (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-3363) The "totalnodes"  and
 "memorytotal" fields show wrong information if the nodes are going down and
 coming up early(before 10min)
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-3363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13162607#comment-13162607 ] 

Devaraj K commented on MAPREDUCE-3363:
--------------------------------------

This issue will cause a huge loss, if multiple nodes restart at a time, and due to the false cluster capacity assumed, many jobs will fail in the cluster, which is a performance hit.
                
> The "totalnodes"  and "memorytotal" fields show wrong information if the nodes are going down and coming up early(before 10min) 
> --------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3363
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3363
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.24.0
>            Reporter: Ramgopal N
>            Assignee: Devaraj K
>         Attachments: Applications.htm, screenshot-1.jpg
>
>
> The node details is not moved from Totalnodes to lostnodes for 600000 ms.So if the node is going down and coming up before the expiry interval, the cluster status in terms of the total nodes and Total cluster memory displays wrong values. 
> Atleast, if the same node is coming up again...should not consider as new node.No point of time duplicate nodes should be displayed in Totalnodes list.

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