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https://issues.apache.org/jira/browse/HDFS-1880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13029909#comment-13029909
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ramkrishna.s.vasudevan commented on HDFS-1880:
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The problem that we are facing is
If we have to switch the namenode using some OM then as the DN is not going
down after few retries, though the namenode switch may happen but this DN still
continues to connect to the old NN.
So we suggest like we can add retry mechanism for a specified interval (this
can be configured) and throw exception so that the DN goes down.
> 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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