ReadWriteLockWithUpgrade: UpgradeException with more than 1 reader/writer waiting to upgrade lock ------------------------------------------------------------------------------------------------- Key: JBCACHE-97 URL: http://jira.jboss.com/jira/browse/JBCACHE-97 Project: JBoss Cache Issue Type: Bug Components: Clustering Reporter: Bela Ban Assigned To: Jason T. Greene Fix For: 2.1.0.GA TxDeadlockUnitTestCase has 2 methods that show the following stack traces: testMoreThanOneUpgrader: Upgrader#0: get(/a/b/c) Upgrader#1: get(/a/b/c) main: locks: /a (read owners=[<null>:2, <null>:1]) /b (read owners=[<null>:2, <null>:1]) /c (read owners=[<null>:2, <null>:1]) Upgrader#0: put(/a/b/c) Upgrader#1: put(/a/b/c) Upgrader#1: org.jboss.cache.lock.LockingException: acquireWriteLock(): lock upgrade failed for /a/b/c (caller=<null>:2); - nested throwable: (org.jboss.cache.lock.UpgradeException: upgradeLockAttempt(): more than one reader trying to simultaneously upgrade to write lock) Upgrader#0: org.jboss.cache.lock.TimeoutException: upgrade lock for /a/b/c could not be acquired after 3000 ms. Lock map ownership Read lock owners: [<null>:2] Write lock owner: null (caller=<null>:1) org.jboss.cache.lock.TimeoutException: upgrade lock for /a/b/c could not be acquired after 3000 ms. Lock map ownership Read lock owners: [<null>:2] Write lock owner: null (caller=<null>:1) at org.jboss.cache.lock.IdentityLock.acquireWriteLock(IdentityLock.java:155) at org.jboss.cache.Node.acquireWriteLock(Node.java:448) at org.jboss.cache.Node.acquire(Node.java:417) at org.jboss.cache.interceptors.LockInterceptor.lock(LockInterceptor.java:199) at org.jboss.cache.interceptors.LockInterceptor.invoke(LockInterceptor.java:144) at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:40) at org.jboss.cache.interceptors.CreateIfNotExistsInterceptor.invoke(CreateIfNotExistsInterceptor.java:145) at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:40) at org.jboss.cache.interceptors.UnlockInterceptor.invoke(UnlockInterceptor.java:35) at org.jboss.cache.TreeCache.invokeMethod(TreeCache.java:2998) at org.jboss.cache.TreeCache.put(TreeCache.java:1657) at org.jboss.test.cache.test.local.TxDeadlockUnitTestCase$MyUpgrader._run(TxDeadlockUnitTestCase.java:346) at org.jboss.test.cache.test.local.TxDeadlockUnitTestCase$GenericThread.run(TxDeadlockUnitTestCase.java:213) at org.jboss.test.cache.test.local.TxDeadlockUnitTestCase$GenericThread.run(TxDeadlockUnitTestCase.java:213) and testConcurrentUpgrade(): MyThread#1: get(/a/b/c) MyThread#2: get(/a/b/c) MyThread#2: done, locks: /a (read owners=[<null>:2]) /b (read owners=[<null>:2]) /c (read owners=[<null>:2]) MyThread#1: done, locks: /a (read owners=[<null>:2, <null>:1]) /b (read owners=[<null>:2, <null>:1]) /c (read owners=[<null>:2, <null>:1]) MyThread#2: put(/a/b/c) MyThread#1: put(/a/b/c) MyThread#1: org.jboss.cache.lock.LockingException: acquireWriteLock(): lock upgrade failed for /a/b/c (caller=<null>:1); - nested throwable: (org.jboss.cache.lock.UpgradeException: upgradeLockAttempt(): more than one reader trying to simultaneously upgrade to write lock) MyThread#2: org.jboss.cache.lock.TimeoutException: upgrade lock for /a/b/c could not be acquired after 3000 ms. Lock map ownership Read lock owners: [<null>:1] Write lock owner: null (caller=<null>:2) org.jboss.cache.lock.TimeoutException: upgrade lock for /a/b/c could not be acquired after 3000 ms. Lock map ownership Read lock owners: [<null>:1] Write lock owner: null (caller=<null>:2) at org.jboss.cache.lock.IdentityLock.acquireWriteLock(IdentityLock.java:155) at org.jboss.cache.Node.acquireWriteLock(Node.java:448) at org.jboss.cache.Node.acquire(Node.java:417) at org.jboss.cache.interceptors.LockInterceptor.lock(LockInterceptor.java:199) at org.jboss.cache.interceptors.LockInterceptor.invoke(LockInterceptor.java:144) at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:40) at org.jboss.cache.interceptors.CreateIfNotExistsInterceptor.invoke(CreateIfNotExistsInterceptor.java:145) at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:40) at org.jboss.cache.interceptors.UnlockInterceptor.invoke(UnlockInterceptor.java:35) at org.jboss.cache.TreeCache.invokeMethod(TreeCache.java:2998) at org.jboss.cache.TreeCache.put(TreeCache.java:1657) at org.jboss.test.cache.test.local.TxDeadlockUnitTestCase$MyThread._run(TxDeadlockUnitTestCase.java:317) at org.jboss.test.cache.test.local.TxDeadlockUnitTestCase$GenericThread.run(TxDeadlockUnitTestCase.java:213) at org.jboss.test.cache.test.local.TxDeadlockUnitTestCase$GenericThread.run(TxDeadlockUnitTestCase.java:213)