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https://issues.apache.org/jira/browse/HDFS-3507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13499167#comment-13499167
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Aaron T. Myers commented on HDFS-3507:
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+1, the latest patch looks good to me. Will commit momentarily.
> DFS#isInSafeMode needs to execute only on Active NameNode
> ---------------------------------------------------------
>
> Key: HDFS-3507
> URL: https://issues.apache.org/jira/browse/HDFS-3507
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ha
> Affects Versions: 2.0.0-alpha, 3.0.0
> Reporter: Vinay
> Assignee: Vinay
> Priority: Critical
> Attachments: HDFS-3507.patch, HDFS-3507.patch, HDFS-3507.patch,
> HDFS-3507.patch
>
>
> Currently DFS#isInSafeMode is not Checking for the NN state. It can be
> executed on any of the NNs.
> But HBase will use this API to check for the NN safemode before starting up
> its service.
> If first NN configured is in standby then DFS#isInSafeMode will check standby
> NNs safemode but hbase want state of Active NN.
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