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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3342) SocketTimeoutException in BlockSender.sendChunks could have a better error message
Date Tue, 01 May 2012 22:26:52 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13266201#comment-13266201
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Todd Lipcon commented on HDFS-3342:
-----------------------------------

This error is easy to reproduce. Put a medium size file (I used 4MB) in HDFS, and then run
something like:
{code}
$ hadoop fs -cat vmlinuz | perl -e 'while (1) { sleep 5; $x += 5; print "$x\n"; }'
{code}

After 8 minutes (the default write timeout) you'll see a SocketTimeoutException in the DN
logs.

                
> SocketTimeoutException in BlockSender.sendChunks could have a better error message
> ----------------------------------------------------------------------------------
>
>                 Key: HDFS-3342
>                 URL: https://issues.apache.org/jira/browse/HDFS-3342
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>    Affects Versions: 2.0.0
>            Reporter: Todd Lipcon
>            Priority: Minor
>
> Currently, if a client connects to a DN and begins to read a block, but then stops calling
read() for a long period of time, the DN will log a SocketTimeoutException "480000 millis
timeout while waiting for channel to be ready for write." This is because there is no "keepalive"
functionality of any kind. At a minimum, we should improve this error message to be an INFO
level log which just says that the client likely stopped reading, so disconnecting it.

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