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https://issues.apache.org/jira/browse/HDFS-1880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13034043#comment-13034043
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Steve Loughran commented on HDFS-1880:
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these are all in the Datanode? This is designed to spin forever waiting for the
Namenode to come back up. Are you also seeing the problem in other clients?
> When Namenode network is unplugged, DFSClient operations waits for ever
> -----------------------------------------------------------------------
>
> Key: HDFS-1880
> URL: https://issues.apache.org/jira/browse/HDFS-1880
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs client
> Reporter: Uma Maheswara Rao G
>
> When NN/DN is shutdown gracefully, the DFSClient operations which are waiting
> for a response from NN/DN, will throw exception & come out quickly
> But when the NN/DN network is unplugged, the DFSClient operations which are
> waiting for a response from NN/DN, waits for ever.
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