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https://issues.apache.org/jira/browse/HDFS-3518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13292594#comment-13292594
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Bikas Saha commented on HDFS-3518:
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Seems like the most useful information we can get would be if the NN is in safe 
mode or not because the JT can then go into a conservative mode wrt task 
failures etc. because these would very likely be related to NN safe mode. 
HDFS-2413 seems to fit the bill but its committed to the 2.0 line.
                
> 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
>          Components: hdfs client
>            Reporter: Bikas Saha
>            Assignee: Tsz Wo (Nicholas), SZE
>
> This will improve the usability of JobTracker safe mode.

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