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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1880) When Namenode network is unplugged, DFSClient operations waits for ever
Date Fri, 06 May 2011 12:04:03 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13029909#comment-13029909
] 

ramkrishna.s.vasudevan commented on HDFS-1880:
----------------------------------------------

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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