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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7221) When Namenode network is unplugged, DFSClient operations waits for ever
Date Tue, 03 May 2011 05:35:03 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13028030#comment-13028030
] 

ramkrishna.s.vasudevan commented on HADOOP-7221:
------------------------------------------------

The problem was whenever network was unplugged the read operation was getting a timedout exception
and it was trying again. This continued for almost 15 times and only then some connectionloss
exception came and could come out.
By this time it was taking around 45 mins.
Hence we have done something like, configure the parameter 
"max.ping.retries.on.socket.timeout" to a value where you can configure a value after which
it should come out after getting a socket time.  So while retrying chk for this configured
value and once reached come out.

This problem comes only in unplug scenarios.  So based on the scenario this value can be configured
as to when how much time it should chk to get a connection.

> When Namenode network is unplugged, DFSClient operations waits for ever
> -----------------------------------------------------------------------
>
>                 Key: HADOOP-7221
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7221
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: ipc
>            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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