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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 19:31:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13250990#comment-13250990

Robert Joseph Evans commented on HDFS-3245:

It would be great to have some sort of statistics about the clients as well.  I know that
is harder because they are transient so it may need to be a separate JIRA, but it would be
very useful. We have seen many issues in the past where a client was not upgraded, but all
of the servers have been, and tracking it down can be painful.
> 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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