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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1764) add 'Time Since Delared Dead' to namenode dead data nodes web page
Date Thu, 17 Mar 2011 17:34:29 GMT
add 'Time Since Delared Dead' to namenode dead data nodes web page
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                 Key: HDFS-1764
                 URL: https://issues.apache.org/jira/browse/HDFS-1764
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Hairong Kuang
            Assignee: Hairong Kuang


I am filing this jira for Andrew. :)

Currently on the dead nodes page of a namenode, we only list the dead datanode's hostnames.
In addition I would like to list the duration since the node was declared as dead, for example
in the same format as the "Decommissioning Nodes" page when it lists "Time Since Decommissioning
Started".

In our Hadoop clusters if a node has only been dead for a few minutes, our monitoring is likely
to bring the node back without us needing to do anything about it. This proposed functionality
will help administrators identify which nodes need manual attention and which nodes are likely
to be fixed by our monitoring. If the node has been dead for many hours, it merits a closer
look.

This seems like useful functionality for open source as well.

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