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https://issues.apache.org/jira/browse/HDFS-6853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15021318#comment-15021318
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Haohui Mai commented on HDFS-6853:
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It might make sense to fix {{isNameNodeUp()}} instead.
> MiniDFSCluster.isClusterUp() should not check if null NameNodes are up
> ----------------------------------------------------------------------
>
> Key: HDFS-6853
> URL: https://issues.apache.org/jira/browse/HDFS-6853
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: James Thomas
> Assignee: James Thomas
> Labels: BB2015-05-TBR
> Attachments: HDFS-6853.2.patch, HDFS-6853.patch
>
>
> Suppose we have a two-NN cluster and then shut down one of the NN's (NN0).
> When we try to restart the other NN (NN1), we wait for isClusterUp() to
> return true, but this will never happen because NN0 is null and isNameNodeUp
> returns false for a null NN.
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