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  1. Hadoop HDFS
  2. HDFS-770

SocketTimeoutException: timeout while waiting for channel to be ready for read

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Details

    • Bug
    • Status: Open
    • Major
    • Resolution: Unresolved
    • 0.20.1
    • None
    • None
    • Ubuntu Linux 8.04

    Description

      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.

      Attachments

        1. filewriter.cpp
          0.6 kB
          Zheng Shao
        2. client.txt
          3 kB
          Leon Mergen
        3. namenode.txt
          3 kB
          Leon Mergen
        4. datanode.txt
          4 kB
          Leon Mergen

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              Unassigned Unassigned
              solatis Leon Mergen
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                Created:
                Updated: