Do you create more than one relationship per transaction? Both the start and the end node have to be lock to create a relationship between them, and locks are not released until the transaction commits. It could also be that you have some other transaction that happens to work with the start and end nodes.
-- Chris Vest System Engineer, Neo Technology [ skype: mr.chrisvest, twitter: chvest ] On 03 Jul 2014, at 18:13, ducky <[email protected]> wrote: > Hi, > I am using Neo4j 2.1.2 and I have an unmanaged extension in which I am trying > to create the following relationships in separate concurrent transactions: > > 1) (b)-[:REL]->(a) > 2) (c)-[:REL]->(a) > > I am never deleting any relationship and I am getting this error: > > org.neo4j.kernel.DeadlockDetectedException: LockClient[118] can't wait on > resource RWLock[NODE(429288), hash=1375407138] since => LockClient[118] > <-[:HELD_BY]- RWLock[NODE(429304), hash=1035143818] <-[:WAITING_FOR]- > LockClient[119] <-[:HELD_BY]- RWLock[NODE(429288), hash=1375407138] > at > org.neo4j.kernel.impl.locking.community.RagManager.checkWaitOnRecursive(RagManager.java:211) > at > org.neo4j.kernel.impl.locking.community.RagManager.checkWaitOnRecursive(RagManager.java:238) > at > org.neo4j.kernel.impl.locking.community.RagManager.checkWaitOn(RagManager.java:178) > at > org.neo4j.kernel.impl.locking.community.RWLock.deadlockGuardedWait(RWLock.java:547) > at > org.neo4j.kernel.impl.locking.community.RWLock.acquireWriteLock(RWLock.java:319) > at > org.neo4j.kernel.impl.locking.community.LockManagerImpl.getWriteLock(LockManagerImpl.java:68) > at > org.neo4j.kernel.impl.locking.community.CommunityLockClient.acquireExclusive(CommunityLockClient.java:73) > at > org.neo4j.kernel.impl.api.LockingStatementOperations.relationshipCreate(LockingStatementOperations.java:215) > at > org.neo4j.kernel.impl.api.OperationsFacade.relationshipCreate(OperationsFacade.java:515) > at > org.neo4j.kernel.impl.core.NodeProxy.createRelationshipTo(NodeProxy.java:455) > .......(snipped)....... > > I've read the section called Deadlocks in the documentation but I don't think > what I am doing should lead to the deadlock. > > Any help would be appreciated. > > Thanks! > > -- > You received this message because you are subscribed to the Google Groups > "Neo4j" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Neo4j" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
