DataNode sends an Success ack when block write fails
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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 javadoc:
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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