Flink报错Can not retract a non-existent record. T...

【报错详情】

java.lang.RuntimeException: Can not retract a non-existent record. This should never happen. at org.apache.flink.table.runtime.operators.rank.RetractableTopNFunction.processElement(RetractableTopNFunction.java:196) at org.apache.flink.table.runtime.operators.rank.RetractableTopNFunction.processElement(RetractableTopNFunction.java:55) at org.apache.flink.streaming.api.operators.KeyedProcessOperator.processElement(KeyedProcessOperator.java:83) at org.apache.flink.streaming.runtime.tasks.OneInputStreamTask$StreamTaskNetworkOutput.emitRecord(OneInputStreamTask.java:205) at org.apache.flink.streaming.runtime.io.AbstractStreamTaskNetworkInput.processElement(AbstractStreamTaskNetworkInput.java:135) at org.apache.flink.streaming.runtime.io.AbstractStreamTaskNetworkInput.emitNext(AbstractStreamTaskNetworkInput.java:106) at org.apache.flink.streaming.runtime.io.StreamOneInputProcessor.processInput(StreamOneInputProcessor.java:66) at org.apache.flink.streaming.runtime.tasks.StreamTask.processInput(StreamTask.java:424) at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:204) at org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:685) at org.apache.flink.streaming.runtime.tasks.StreamTask.executeInvoke(StreamTask.java:640) at org.apache.flink.streaming.runtime.tasks.StreamTask.runWithCleanUpOnFail(StreamTask.java:651) at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:624) at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:799) at org.apache.flink.runtime.taskmanager.Task.run(Task.java:586) at java.lang.Thread.run(Thread.java:877) 

【报错原因及解决方案】