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https://issues.apache.org/jira/browse/HDFS-3245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13750218#comment-13750218
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Ravi Prakash commented on HDFS-3245:
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I wasn't able to reproduce the the unit test failure
> 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: namenode
> Affects Versions: 2.0.0-alpha
> Reporter: Todd Lipcon
> Assignee: Ravi Prakash
> Attachments: HDFS-3245.branch-2.patch, HDFS-3245.branch-2.patch,
> HDFS-3245.branch-2.patch, HDFS-3245.branch-2.patch, HDFS-3245.patch,
> HDFS-3245.patch, HDFS-3245.patch
>
>
> 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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