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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-637) DataNode sends an Success ack when block write fails
Date Mon, 21 Sep 2009 06:00:18 GMT
DataNode sends an Success ack when block write fails

                 Key: HDFS-637
                 URL: https://issues.apache.org/jira/browse/HDFS-637
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: data-node
            Reporter: Hairong Kuang
            Assignee: Hairong Kuang
            Priority: Blocker
             Fix For: 0.21.0

When I work on HDFS-624, I saw TestFileAppend3#TC7 occasionally fails. After lots of debug,
I saw that the client unexpected received a response of "-2 SUCCESS SUCCESS" in which -2 is
the packet sequence number. This happened in a pipeline of 2 datanodes and one of them failed.
It turned out when block receiver fails, it shuts down itself and interrupts the packet responder
but responder tries to handle interruption with the condition "Thread.isInterrupted()" but
unfortunately a thread's interrupt status is not set in some cases as explained in the Thread#interrupt

 If this thread is blocked in an invocation of the wait(), wait(long), or wait(long, int)
methods of the Object  class, or of the join(), join(long), join(long, int), sleep(long),
or sleep(long, int), methods of this class, then its interrupt status will be cleared and
it will receive an InterruptedException. 

So datanode does not detect the interruption and continues as if no error occurs.

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