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From "Leon Mergen (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-770) SocketTimeoutException: timeout while waiting for channel to be ready for read
Date Fri, 13 Nov 2009 08:18:39 GMT
SocketTimeoutException: timeout while waiting for channel to be ready for read
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                 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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