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Date: Tue, 10 Apr 2012 18:55:13 +0000 (UTC)
From: "Todd Lipcon (Created) (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
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Subject: [jira] [Created] (HDFS-3245) Add metrics and web UI for cluster
 version summary
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Add metrics and web UI for cluster version summary
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                 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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