I think you have to change it to use merge which takes a schema index lock.
ie.
create constraint on (h:HEAD) assert h.list is unique;
> MERGE (headNode:HEAD {list:"mylist"})
MATCH (headNode)-[old:LINK]->after
>
> DELETE old
> CREATE headNode-[:LINK]->(newNode:LINKNODE { number : {nodeNumber}
> })-[:LINK]->after
HTH
Michael
Am 10.02.2014 um 11:30 schrieb Aran Mulholland <[email protected]>:
> I've got some real headaches inserting into linked lists.
>
> If I create a node as such:
>
> CREATE (headNode:HEAD)-[:LINK]->(headNode)
>
> then insert like so
>
> MATCH (headNode:HEAD)-[old:LINK]->after
> DELETE old
> CREATE headNode-[:LINK]->(newNode:LINKNODE { number : {nodeNumber}
> })-[:LINK]->after
>
> then everything is fine and dandy. But when I try to run the insertion code
> in parallel, then I get some real issues. I either get an error like
> "Relationship 325457 not found" or I get two or more lists coming off the
> headNode. The first error I can deal with as I can rerun the query, the
> second is totally unacceptable as my other queries get very messed up results.
>
> I am writing for a twitter like service and am using the linked lists so I
> can have a news feed. There is a high possibility that the list will need to
> be added to by more than one user at once, and this chance will grow the more
> users the system has.
>
> What I want to be able to do is put a lock around the insertion so that this
> does not happen.
>
> How can I better craft my queries so that parallel insertion via cypher over
> REST is sustainable?
>
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