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https://issues.apache.org/jira/browse/HDFS-770?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Leon Mergen updated HDFS-770:
-----------------------------

    Attachment: client.txt
                namenode.txt
                datanode.txt

> SocketTimeoutException: timeout while waiting for channel to be ready for read
> ------------------------------------------------------------------------------
>
>                 Key: HDFS-770
>                 URL: https://issues.apache.org/jira/browse/HDFS-770
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: contrib/libhdfs, data-node, hdfs client, name-node
>    Affects Versions: 0.20.1
>         Environment: Ubuntu Linux 8.04
>            Reporter: Leon Mergen
>         Attachments: client.txt, datanode.txt, namenode.txt
>
>
> We're having issues with timeouts occurring in our client: for some reason, a 
> timeout of 63000 milliseconds is triggered while writing HDFS data. Since we 
> currently have a single-server setup, this results in our client terminating 
> with a "All datanodes are bad" IOException.
> We're running all services, including the client, on our single server, so it 
> cannot be a network error. The load on the client is extremely low during 
> this period: only a few kilobytes a minute were being written around the time 
> the error occured. 
> After browsing a bit online, a lot of people talk about setting 
> "dfs.datanode.socket.write.timeout" to 0 as a solution for this problem. Due 
> to the low load of our system during this period, however, I do feel this is 
> a real error and a timeout that should not be occurring. I have attached 3 
> logs of the namenode, datanode and client.
> It could be that this is related to 
> http://issues.apache.org/jira/browse/HDFS-693
> Any pointers on how I can assist to resolve this issue will be greatly 
> appreciated.

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