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From "Robert Joseph Evans (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3245) Add metrics and web UI for cluster version summary
Date Tue, 10 Apr 2012 20:49:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13251052#comment-13251052
] 

Robert Joseph Evans commented on HDFS-3245:
-------------------------------------------

That makes since.
                
> Add metrics and web UI for cluster version summary
> --------------------------------------------------
>
>                 Key: HDFS-3245
>                 URL: https://issues.apache.org/jira/browse/HDFS-3245
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: 2.0.0
>            Reporter: Todd Lipcon
>
> With the introduction of protocol compatibility, once HDFS-2983 is committed, we have
the possibility that different nodes in a cluster are running different software versions.
To aid operators, we should add the ability to summarize the status of versions in the cluster,
so they can easily determine whether a rolling upgrade is in progress or if some nodes "missed"
an upgrade (eg maybe they were out of service when the software was updated)

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