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我们有一个密码如下：

START n=node:ACCOUNTS(ACCOUNT_ID={id}) 
MATCH (n)-[:PROVIDER]->(p)<-[r:ALERT]-(m) 
RETURN p.ID as pID, p.FIRST_NAME? as pFN, p.LAST_NAME? as pLN, count(r) as alerts

即使在重负载下，这也始终可以正常工作。但是，我们有时会删除单独线程中的关系（在事务中）。

由于时机非常糟糕，我们收到了这个错误：

******Relationship 13407007 not found
org.neo4j.graphdb.NotFoundException: Relationship 13407007 not found
        at org.neo4j.kernel.impl.core.NodeManager.__AW_getRelationshipForProxy(NodeManager.java:675)
        at org.neo4j.kernel.impl.core.NodeManager.getRelationshipForProxy(NodeManager.java)
        at org.neo4j.kernel.InternalAbstractGraphDatabase$5.lookupRelationship(InternalAbstractGraphDatabase.java:689)
        at org.neo4j.kernel.impl.core.RelationshipProxy.getOtherNode(RelationshipProxy.java:73)
        at org.neo4j.cypher.internal.pipes.matching.FilteringIterable$FilteringIterator.spoolToNextInLine(FilteringIterable.scala:58)
        at org.neo4j.cypher.internal.pipes.matching.FilteringIterable$FilteringIterator.next(FilteringIterable.scala:49)
        at org.neo4j.cypher.internal.pipes.matching.FilteringIterable$FilteringIterator.next(FilteringIterable.scala:35)
        at scala.collection.convert.Wrappers$IteratorWrapper.next(Wrappers.scala:30)
        at org.neo4j.kernel.impl.traversal.TraversalBranchImpl.__AW_next(TraversalBranchImpl.java:137)
        at org.neo4j.kernel.impl.traversal.TraversalBranchImpl.next(TraversalBranchImpl.java)
        at org.neo4j.kernel.impl.traversal.TraversalBranchWithState.next(TraversalBranchWithState.java:32)
        at org.neo4j.kernel.PreorderDepthFirstSelector.__AW_next(PreorderDepthFirstSelector.java:52)
        at org.neo4j.kernel.PreorderDepthFirstSelector.next(PreorderDepthFirstSelector.java)
        at org.neo4j.kernel.impl.traversal.TraverserIterator.fetchNextOrNull(TraverserIterator.java:65)
        at org.neo4j.kernel.impl.traversal.TraverserIterator.fetchNextOrNull(TraverserIterator.java:34)
        at org.neo4j.helpers.collection.PrefetchingIterator.hasNext(PrefetchingIterator.java:55)
        at scala.collection.convert.Wrappers$JIteratorWrapper.hasNext(Wrappers.scala:41)
        at scala.collection.Iterator$$anon$13.__AW_hasNext(Iterator.scala:371)
        at scala.collection.Iterator$$anon$13.hasNext(Iterator.scala)
        at scala.collection.Iterator$$anon$13.__AW_hasNext(Iterator.scala:371)
        at scala.collection.Iterator$$anon$13.hasNext(Iterator.scala)
        at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:327)
        at scala.collection.Iterator$class.__AW_foreach(Iterator.scala:727)
        at scala.collection.Iterator$class.foreach(Iterator.scala)
        at scala.collection.AbstractIterator.foreach(Iterator.scala:1156)
        at org.neo4j.cypher.internal.pipes.EagerAggregationPipe.internalCreateResults(EagerAggregationPipe.scala:76)
        at org.neo4j.cypher.internal.pipes.PipeWithSource.createResults(Pipe.scala:69)
        at org.neo4j.cypher.internal.pipes.PipeWithSource.createResults(Pipe.scala:66)
        at org.neo4j.cypher.internal.executionplan.ExecutionPlanImpl.org$neo4j$cypher$internal$executionplan$ExecutionPlanImpl$$prepareStateAndResult(ExecutionPlanImpl
.scala:164)
        at org.neo4j.cypher.internal.executionplan.ExecutionPlanImpl$$anonfun$getLazyReadonlyQuery$1.apply(ExecutionPlanImpl.scala:139)
        at org.neo4j.cypher.internal.executionplan.ExecutionPlanImpl$$anonfun$getLazyReadonlyQuery$1.apply(ExecutionPlanImpl.scala:138)
        at org.neo4j.cypher.internal.executionplan.ExecutionPlanImpl.execute(ExecutionPlanImpl.scala:38)
        at org.neo4j.cypher.ExecutionEngine.execute(ExecutionEngine.scala:72)
        at org.neo4j.cypher.ExecutionEngine.execute(ExecutionEngine.scala:76)
        at org.neo4j.cypher.javacompat.ExecutionEngine.execute(ExecutionEngine.java:79)

我们不会为密码执行启动事务。请就可能导致此问题的原因提出建议并进行修复。这是 Neo4j 社区 1.9.3

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1 回答 1

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背景： Cypher 没有读取锁，这可能会在 v2.1 中修复

久经考验的解决方案： 捕获 NotFoundexception，休眠并重试查询

另一个解决方案：（ 不确定它是否真的是一个解决方案 - 我们正在进一步测试）：将方法包装在事务中

于 2013-09-23T15:06:00.210 回答