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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