The following error, via bin/neo4j-shell:

Database constraints have changed (txId=84) after this transaction (txId=81) started, which is not yet supported. Please retry your transaction to ensure all constraints are executed.

or as logged in log/debug.log (3.x) or graph.db/messages.log (2.3.x):

2016-10-18 16:40:43.595+0000 ERROR [o.n.s.r.t.TransactionFacade]: Failed to commit transaction.
java.lang.RuntimeException: org.neo4j.kernel.api.exceptions.TransactionFailureException: Database constraints have changed (txId=81) after this transaction
(txId=84) started, which is not yet supported. Please retry your transaction to ensure all constraints are executed.
at org.neo4j.server.rest.transactional.TransitionalTxManagementKernelTransaction.commit(TransitionalTxManagementKernelTransaction.java:87) ~[neo4j-server-2.2.8.jar:2.2.8]
at org.neo4j.server.rest.transactional.TransactionHandle.closeContextAndCollectErrors(TransactionHandle.java:278) [neo4j-server-2.2.8.jar:2.2.8]

can be explained by the following scenario:

txID Date/time Cypher Statement

81

Oct-19-2012 09:00

Begin

84

Oct-19-2012 09:01

Begin

84

Oct-19-2012 09:02

create constraint on (n:Person) assert n.user_id is unique;

84

Oct-19-2012 09:03

Commit

81

Oct-19-2012 09:04

create (n:Person {user_id:1234})

81

Oct-19-2012 09:05

Commit

where the exception is thrown at Oct-19-2012 09:05 by the Cypher statement with txID 81 when it tries to create a node which applies to the newly committed constraint, and the transaction is rolled back. Correct remedial action is to resubmit the failed transaction.

Details


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Keywords:
constraintneo4j-2.2neo4j-2.3neo4j-3.0