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From "Jason Lowe (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-7888) TestFailoverProxy fails intermittently on trunk
Date Wed, 07 Dec 2011 01:54:41 GMT
TestFailoverProxy fails intermittently on trunk
-----------------------------------------------

                 Key: HADOOP-7888
                 URL: https://issues.apache.org/jira/browse/HADOOP-7888
             Project: Hadoop Common
          Issue Type: Bug
          Components: test
    Affects Versions: 0.24.0
            Reporter: Jason Lowe


TestFailoverProxy can fail intermittently with the failures occurring in testConcurrentMethodFailures().
 The test has a race condition where the two threads may be sequentially invoking the unreliable
interface rather than concurrently.  Currently the proxy provider's getProxy() method contains
the thread synchronization to enforce a concurrent invocation, but examining the source to
RetryInvocationHandler.invoke() shows that the call to getProxy() during failover is too late
to enforce a truly concurrent invocation.

For this particular test, one thread could race ahead and block on the CountDownLatch in getProxy()
before the other thread even enters RetryInvocationHandler.invoke().  If that happens the
second thread will cache the newly updated value for proxyProviderFailoverCount, since the
failover has mostly been processed by the original thread.  Therefore the second thread ends
up assuming no other thread is present, performs a failover, and the test fails because two
failovers occurred instead of one.

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