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Bug
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Resolution: Done
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Minor
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6.0.2.Final
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None
I think I have found a problem with asynchronous get operation in Ispn-6.0.2. I am using it like this to read a set of values based on their IDs:
for (String string : ids) { cache.getAsync(string).attachListener(new FutureListener<MyClass>() { @Override public void futureDone(Future<MyClass> future) { try { queue.put(future.get()); } catch (InterruptedException | ExecutionException | NullPointerException ignore) { } } }); }
When I start to use it more heavily (hundreds of simultaneous reads) it happens to me that (probably all) the reading threads (transport-thread-0 to -24) got stuck in the "future.get()" method with this stack trace:
Hidden Source Calls (Unsafe.park) LockSupport.park:186 AbstractQueuedSynchronizer.parkAndCheckInterrupt:834 AbstractQueuedSynchronizer.doAcquireSharedInterruptibly:994 AbstractQueuedSynchronizer.acquireSharedInterrptibly:1303 FutureTask$Sync.innerGet:248 FutureTask.get:111 NotifyingFutureAdaptor.get:44 SomeMyClass$2.futureDone:113
I understand it like this: the async read was finished because the .futureDone method was called, but the method cannot get to the result from "Future", which is very strange...
When I rewrote the code so that it does not use the FutureListener (and thus it is in general less efficient), it works:
Future<MyClass> [] futures = new Future [idCount]; int counter = 0; for (String string : ids) { futures[counter ++] = cacheToReadFrom.getAsync(string); } for (Future<MyClass> future : futures) { try { queue.put(future.get()); } catch (InterruptedException | ExecutionException | NullPointerException ignore) { } }
