[jira] Resolved: (JCR-2623) Deadlock in cluster when registering node types

["Thomas Mueller (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/JCR-2623?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thomas Mueller resolved JCR-2623.
---------------------------------

    Resolution: Duplicate

> Deadlock in cluster when registering node types
> -----------------------------------------------
>
>                 Key: JCR-2623
>                 URL: https://issues.apache.org/jira/browse/JCR-2623
>             Project: Jackrabbit Content Repository
>          Issue Type: Bug
>          Components: clustering
>    Affects Versions: 1.5.0, 2.0.0
>            Reporter: Thomas Draier
>
> Hi,
> I've got a deadlock when using clusters and making node types registration on both nodes at the same time - One of the node starts reading journal entries before registering the node type, and is then blocked when trying to register types - both thread locks the journal and the node types registry :
> "ClusterNode-exp01" id=151 idx=0x244 tid=2384 prio=5 alive, in native, blocked, daemon
>     -- Blocked trying to get lock: org/apache/jackrabbit/core/nodetype/NodeTypeRegistry@0x00000001923C9660[thin lock]
>     at jrockit/vm/Threads.sleep(I)V(Native Method)
>     at jrockit/vm/Locks.waitForThinRelease(Locks.java:1209)
>     at jrockit/vm/Locks.monitorEnterSecondStageHard(Locks.java:1342)
>     at jrockit/vm/Locks.monitorEnterSecondStage(Locks.java:1259)
>     at jrockit/vm/Locks.monitorEnter(Locks.java:2466)
>     at org/apache/jackrabbit/core/nodetype/NodeTypeRegistry.registerNodeTypes(NodeTypeRegistry.java:223)
>     at org/apache/jackrabbit/core/nodetype/NodeTypeRegistry.externalRegistered(NodeTypeRegistry.java:691)
>     at org/apache/jackrabbit/core/cluster/ClusterNode.process(ClusterNode.java:925)
>     at org/apache/jackrabbit/core/cluster/NodeTypeRecord.process(NodeTypeRecord.java:202)
>     at org/apache/jackrabbit/core/cluster/ClusterNode.consume(ClusterNode.java:798)
>     at org/apache/jackrabbit/core/journal/AbstractJournal.doSync(AbstractJournal.java:213)
>     at org/apache/jackrabbit/core/journal/AbstractJournal.sync(AbstractJournal.java:188)
>     at org/apache/jackrabbit/core/cluster/ClusterNode.sync(ClusterNode.java:315)
>     at org/apache/jackrabbit/core/cluster/ClusterNode.run(ClusterNode.java:286)
>     at java/lang/Thread.run(Thread.java:619)
> ...
> "[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)'" id=15 idx=0x44 tid=4348 prio=5 alive, in native, waiting, daemon
>     -- Waiting for notification on: EDU/oswego/cs/dl/util/concurrent/WriterPreferenceReadWriteLock$WriterLock@0x00000001921DD110[fat lock]
>     at jrockit/vm/Threads.waitForNotifySignal(JLjava/lang/Object;)Z(Native Method)
>     at java/lang/Object.wait(J)V(Native Method)[optimized]
>     at EDU/oswego/cs/dl/util/concurrent/WriterPreferenceReadWriteLock$WriterLock.acquire(WriterPreferenceReadWriteLock.java:240)
>     ^-- Lock released while waiting: EDU/oswego/cs/dl/util/concurrent/WriterPreferenceReadWriteLock$WriterLock@0x00000001921DD110[fat lock]
>     at org/apache/jackrabbit/core/journal/AbstractJournal.lockAndSync(AbstractJournal.java:250)
>     at org/apache/jackrabbit/core/journal/DefaultRecordProducer.append(DefaultRecordProducer.java:51)
>     at org/apache/jackrabbit/core/cluster/ClusterNode.registered(ClusterNode.java:468)
>     at org/apache/jackrabbit/core/nodetype/NodeTypeRegistry.registerNodeTypes(NodeTypeRegistry.java:233)
>     ^-- Holding lock: org/apache/jackrabbit/core/nodetype/NodeTypeRegistry@0x00000001923C9660[thin lock]
>     at org/apache/jackrabbit/core/nodetype/NodeTypeRegistry.registerNodeTypes(NodeTypeRegistry.java:208)
>     at org/apache/jackrabbit/core/nodetype/NodeTypeManagerImpl.registerNodeTypes(NodeTypeManagerImpl.java:431)
>     at org/apache/jackrabbit/core/nodetype/NodeTypeManagerImpl.registerNodeTypes(NodeTypeManagerImpl.java:282)
> - thread1 reads an entry from the journal, acquire a read lock on the Journal.rwLock, start reading entries. 
> - Second thread start registering new node types. It gets the NodeTypeRegistry lock. Then tries to write journal entries for new node types - but blocks on getting writeLock for Journal.rwLock. 
> - Back to first thread, continues reading journal entries, find a NodeTypeRecord of type register - tries to register the nodeType. NodeTypeRegistry is still own by thread2, both threads are blocked.

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