*Original:*
BEGIN
 LET vert-func1 = CREATE vertex Post SET createdAt = 
"2014-08-18T16:42:13.725Z", updatedAt = "2014-08-18T16:42:13.725Z", note = 
"Some 
note" RETURN @rid
 LET edge-func1 = CREATE edge UserWrotePost FROM #5:32 TO $vert-func1
 
COMMIT RETRY 100 
 RETURN $vert-func1 

Here's the thing- when running this many times in a row, I sometimes get 
negative RIDs. It's unclear why, but it's some sort of result of failure.

How should I make the query using a pessimistic approach? (An approach 
which locks the vertex)

Also, is there anything else what could cause failure here in a high 
concurrency situation? Thanks!

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