Hi everyone, I am currently testing neo4j (1.0-b9)as a persistence layer for an app. I have encountered an strange problem.
I have two threads creating relations at the same time (both open transactions) (0 is root node) T1(main): Begin transaction --> create relationship 0 -> 1 --> Close Transaction --> Begin transaction --> create relationship 1 -> 2 --> create T2 --> wait for T2 --> set property 2 --> .... --> Close Transaction --> .... T2: Begin transaction --> create relationship 0 -> 3 --> set property 3 --> Close Transaction T1 is waiting for T2 to end, but it never does because of a deadlock. Why is there such a deadlock? The nodes are not the same (concurrent transactions for 1->2 and 0->3 creation). This does not occur during this situation (0->1, 0->3 exist in database, 0 is root node) T1(main): Begin transaction --> obtain node 1 --> Close Transaction --> Begin transaction --> create relationship 1->2 --> create T2 --> wait for T2 --> set property 2 --> .... --> Close transaction --> .... T2: Begin transaction --> Obtain 3 --> set property 3 --> Close Transaction In this case both transactions commit correctly. Is there a global lock in neo4j when creating relationships? Thanks for your help, -- Daniel Martínez _______________________________________________ Neo mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
