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https://issues.apache.org/jira/browse/HADOOP-3767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12619930#action_12619930
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Steve Loughran commented on HADOOP-3767:
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I'm merging this in to HADOOP-3628, making it the liveness test for the
namenode.
> Brief, baseline namenode health check
> -------------------------------------
>
> Key: HADOOP-3767
> URL: https://issues.apache.org/jira/browse/HADOOP-3767
> Project: Hadoop Core
> Issue Type: New Feature
> Components: dfs
> Reporter: Chris Douglas
> Priority: Minor
> Attachments: 3767-0.patch, 3767-1.patch
>
>
> It would be helpful if there were a way to query the namenode to verify that
> it is basically healthy. In particular, that all the expected threads are
> running, data structures appear sane, etc. Administrators could use this
> interface to verify that the namenode is both up and essentially functional,
> attaching cron jobs, notification, etc. as required.
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