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
Type: Bug
Reporter: Bela Ban
Assigned to: Bela Ban
Fix For: 1.2.1
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)
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