Cluster: Node type register/unregister deadlock
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Key: JCR-2866
URL: https://issues.apache.org/jira/browse/JCR-2866
Project: Jackrabbit Content Repository
Issue Type: Bug
Components: clustering
Reporter: Thomas Mueller
Assignee: Thomas Mueller
Fix For: 2.2.2
A deadlock can occur when two cluster nodes concurrently register or unregister
node types.
Reason:
NodeTypeRegistry.registerNodeTypes is synchronized, and calls
eventChannel.registered(ntDefs), which calls AbstractJournal.lockAndSync(),
which tries to lock AbstractJournal.rwLock.
On the other hand, AbstractJournal.sync() locks AbstractJournal.rwLock, then
calls NodeTypeRecord.process, which calls NodeTypeRegistry.unregisterNodeTypes,
which is also synchronized.
Possible solutions: Either
- NodeTypeRegistry doesn't synchronize on the object when calling a
eventChannel method,
- or NodeTypeRegistry locks AbstractJournal.rwLock before synchronizing.
There might be other solutions.
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