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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1529) Incorrect handling of interrupts in waitForAckedSeqno can cause deadlock
Date Mon, 06 Dec 2010 18:51:09 GMT
Incorrect handling of interrupts in waitForAckedSeqno can cause deadlock
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                 Key: HDFS-1529
                 URL: https://issues.apache.org/jira/browse/HDFS-1529
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs client
    Affects Versions: 0.22.0
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon
            Priority: Blocker


In HDFS-895 the handling of interrupts during hflush/close was changed to preserve interrupt
status. This ends up creating an infinite loop in waitForAckedSeqno if the waiting thread
gets interrupted, since Object.wait() has a strange semantic that it doesn't give up the lock
even momentarily if the thread is already in interrupted state at the beginning of the call.

We should decide what the correct behavior is here - if a thread is interrupted while it's
calling hflush() or close() should we (a) throw an exception, perhaps InterruptedIOException
(b) ignore, or (c) wait for the flush to finish but preserve interrupt status on exit?

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