Bruce Schuchardt created GEODE-2228:
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Summary: FutureResult.get() does not check for cancellation prior
to waiting for a result
Key: GEODE-2228
URL: https://issues.apache.org/jira/browse/GEODE-2228
Project: Geode
Issue Type: Bug
Components: distributed lock service
Reporter: Bruce Schuchardt
A system was found hung with a thread in this state:
{noformat}
vm_0_bridge1_w1-gst-dev23_17330:ServerConnection on port 21566 Thread 352
ID=861 state=TIMED_WAITING
waiting to lock <java.util.concurrent.CountDownLatch$Sync@41c71f7d>
at sun.misc.Unsafe.park(Native Method)
at
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:226)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedNanos(AbstractQueuedSynchronizer.java:1033)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireSharedNanos(AbstractQueuedSynchronizer.java:1326)
at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:282)
at
com.gemstone.gemfire.internal.util.concurrent.StoppableCountDownLatch.await(StoppableCountDownLatch.java:55)
at
com.gemstone.gemfire.internal.util.concurrent.FutureResult.get(FutureResult.java:54)
at
com.gemstone.gemfire.distributed.internal.locks.DLockService.waitForLockGrantorFutureResult(DLockService.java:774)
at
com.gemstone.gemfire.distributed.internal.locks.DLockService.notLockGrantorId(DLockService.java:837)
at
com.gemstone.gemfire.distributed.internal.locks.DLockService.releaseTryLocks(DLockService.java:2216)
at
com.gemstone.gemfire.internal.cache.locks.TXLockServiceImpl.release(TXLockServiceImpl.java:222)
locked <java.util.ArrayList@34bbf1cf>
at
com.gemstone.gemfire.internal.cache.TXLockRequest.releaseDistributed(TXLockRequest.java:91)
at
com.gemstone.gemfire.internal.cache.TXLockRequest.cleanup(TXLockRequest.java:120)
at com.gemstone.gemfire.internal.cache.TXState.cleanup(TXState.java:730)
at com.gemstone.gemfire.internal.cache.TXState.commit(TXState.java:447)
at
com.gemstone.gemfire.internal.cache.TXStateProxyImpl.commit(TXStateProxyImpl.java:234)
at
com.gemstone.gemfire.internal.cache.TXManagerImpl.commit(TXManagerImpl.java:325)
{noformat}
No other threads were trying to find the lock grantor and further testing
showed that the FutureResult that this thread was using must have been
cancelled by another thread. I wrote a unit test and found that FutureResult
is not respecting its cancelled state in its get() methods.
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