impy core on 1.4.1 - described in
http://www.jboss.com/index.html?module=bb&op=viewtopic&t=116337 forum thread
I have just tested core on 2.0.0. GA - and exception was ... timeout.
stack:
org.jboss.cache.lock.TimeoutException: failure acquiring lock: fqn=/a/b/c/d,
caller=GlobalTransaction::4, lock=write owner=GlobalTransaction::3
(activeReaders=0, activeWriter=Thread[Thread-2,5,main], waitingReaders=0,
waitingWriters=0, waitingUpgrader=0)
at org.jboss.cache.lock.IdentityLock.acquire(IdentityLock.java:528)
at
org.jboss.cache.interceptors.PessimisticLockInterceptor$LockManager.acquire(PessimisticLockInterceptor.java:579)
at
org.jboss.cache.interceptors.PessimisticLockInterceptor.acquireNodeLock(PessimisticLockInterceptor.java:393)
at
org.jboss.cache.interceptors.PessimisticLockInterceptor.lock(PessimisticLockInterceptor.java:329)
at
org.jboss.cache.interceptors.PessimisticLockInterceptor.invoke(PessimisticLockInterceptor.java:187)
at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:76)
at
org.jboss.cache.interceptors.NotificationInterceptor.invoke(NotificationInterceptor.java:32)
(...)
main loop:
| for (int x = 0; x < 1000; x++) {
| tm.begin();
| if (remove) {
| cache.remove("/a/b/c/d");
| cache.remove("/a");
| } else {
| cache.put("/a/b/c/d",
"key","text" + x);
| }
| tm.commit();
| Thread.sleep(1);
| }
|
one thread is putting key-value pair into /a/b/c/d node and second thread is
removing this node.
And now I don't known what is it: just bug or normal situation.
If this is normal situation - how TimeoutException can be explained? One thread
is executing only one operation in one transaction (classical deadlock needs 2
operations in one transaction...)
I need to run many paraller threads, and every thread should modify exactly
this same node. Which cache should be used? [I think that every cache (pojo,
core, 1.4.1, 2.0.0 can be used)] Now looks that only PojoCache in version 1.4.1
works correctly in Multithread environment...
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