java.net.SocketTimeoutException: 480000 millis timeout while waiting for 
channel to be ready for write exceptions were cast when trying to read file via 
StreamFile.
--------------------------------------------------------------------------------------------------------------------------------------------------------------------

                 Key: HDFS-693
                 URL: https://issues.apache.org/jira/browse/HDFS-693
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: data-node
    Affects Versions: 0.20.1
            Reporter: Yajun Dong


To exclude the case of network problem, I found the count of  dataXceiver is 
about 30.  Also, I could see the output of netstate -a | grep 50075 has many 
TIME_WAIT status when this happened. (In Hadoop-0.19.0, this issue is never 
happened).

partial log in attachment. 



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