2019-02-20 21:40:52.146+0000 WARN Error during iterate.commit:2019-02-20 21:40:52.147+0000 WARN 4 times: org.neo4j.graphdb.TransactionFailureException: Transaction was marked as successful, but unable to commit transaction so rolled back.2019-02-20 21:40:52.147+0000 WARN Error during iterate.execute:2019-02-20 21:40:52.147+0000 WARN 4 times: Cannot merge node using null property value for dscaException: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "Abandoned connection cleanup thread"Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "neo4j.VmPauseMonitor-1"Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "qtp236463187-77"Exception in thread “neo4j.Scheduler-1” Exception in thread “Scheduler-581609489” 2019-02-21 07:40:50.002+0000 WARN Java heap spacejava.lang.OutOfMemoryError: Java heap spacejava.lang.OutOfMemoryError: Java heap space2019-02-21 07:40:50.003+0000 WARN Unexpected thread death: {} in {}java.lang.OutOfMemoryError: Java heap spaceException in thread “neo4j.BoltNetworkIO-8” java.lang.OutOfMemoryError: Java heap space