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https://issues.apache.org/jira/browse/HADOOP-4029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12654011#action_12654011
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Konstantin Shvachko commented on HADOOP-4029:
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+1
> NameNode should report status and performance for each replica of image and
> log
> -------------------------------------------------------------------------------
>
> Key: HADOOP-4029
> URL: https://issues.apache.org/jira/browse/HADOOP-4029
> Project: Hadoop Core
> Issue Type: New Feature
> Components: dfs
> Affects Versions: 0.20.0
> Reporter: Robert Chansler
> Assignee: Boris Shkolnik
> Attachments: HADOOP-4029-1.patch, HADOOP-4029-2.patch,
> HADOOP-4029.patch
>
>
> The administrator should have immediate access to the status of each replica.
> In addition to reporting whether the replica is active or not, measured
> performance should be reported so as to indicate whether a replica might
> impact cluster performance or might be in danger of failing.
> We're probably not close to doing automated replica fail over, but we can
> give the administrator some clues.
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