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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3357) DataXceiver reads from client socket with incorrect/no timeout
Date Thu, 03 May 2012 05:16:18 GMT
Todd Lipcon created HDFS-3357:
---------------------------------

             Summary: DataXceiver reads from client socket with incorrect/no timeout
                 Key: HDFS-3357
                 URL: https://issues.apache.org/jira/browse/HDFS-3357
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: data-node
    Affects Versions: 1.0.2, 2.0.0
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon
            Priority: Critical


In DataXceiver, we currently use Socket.setSoTimeout to try to manage the read timeout when
switching between reading the initial opCode, reading a keepalive opcode, and reading the
status after a successfully sent block. However, since all of these reads use the same underlying
DataInputStream, the change to the socket timeout isn't respected. Thus, they all occur with
whatever timeout is set on the socket at the time of DataXceiver construction. In practice
this turns out to be 0, which can cause infinitely hung xceivers.

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