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https://issues.apache.org/jira/browse/HDFS-3518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13292035#comment-13292035
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Suresh Srinivas commented on HDFS-3518:
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@Bikas, I have not spent a lot of time on MAPREDUCE-4328. What you want is a
mechanism to see the service state of Namenode, so JT can go into safe mode?
> Provide API to check HDFS operational state
> -------------------------------------------
>
> Key: HDFS-3518
> URL: https://issues.apache.org/jira/browse/HDFS-3518
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Bikas Saha
>
> This will improve the usability of JobTracker safe mode.
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