Thanks Michael. Sorry I should have been more clear, there is already a Unique constraint on the 'type' property. What do you mean by "And only the label from the constraint"?
On Friday, 29 August 2014 15:25:35 UTC+1, Michael Hunger wrote: > > You need a unique constraint for this to work > > And only the label from the constraint > > > > Sent from mobile device > > Am 29.08.2014 um 15:36 schrieb Mark Findlater <mark.fi...@googlemail.com > <javascript:>>: > > Using Neo4J embedded version 2.1.3 and Spring Data Neo4J 3.1.4.RELEASE and > seeing odd behaviour when calling MERGE from multiple threads. Is it > expected that concurrent merge operations (with the same values) will > result in a single unique node and will operations that use the ON CREATE > and ON MATCH constructs acquire a write lock on that node? > > The last comment from Andres Taylor on the documentation for 2.0 > <http://docs.neo4j.org/chunked/2.0.0/query-merge.html> suggest that it > should all be complete by now. > > I am seeing an issue with this query where multiple concurrent calls > return the same value. > > MERGE (nid:UniqueId:_UniqueId{type:{0}}) > ON CREATE SET nid.count = 1 > ON MATCH SET nid.count = nid.count + 1 > RETURN nid.count > > There is a label index on the type property. > > I see the same behaviour whether using the Neo4JTemplate or an annotated > Repository method, currently I am getting a deadlock when I try using the > ExecutionEngine directly (looking at this now). I should note that the > deadlock appears to be in the ForsetiClient so the presence of the HA jars > on my classpath may be important. > > -- > 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 neo4j+un...@googlegroups.com <javascript:>. > 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 neo4j+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
