报错日志如下，为什么出现报错呢？

"报错日志如下，为什么出现报错呢？ org.apache.flink.runtime.JobException: Recovery is suppressed by NoRestartBackoffTimeStrategy

at org.apache.flink.runtime.executiongraph.failover.flip1.ExecutionFailureHandler.handleFailure(ExecutionFailureHandler.java:139)

at org.apache.flink.runtime.executiongraph.failover.flip1.ExecutionFailureHandler.getGlobalFailureHandlingResult(ExecutionFailureHandler.java:102)

at org.apache.flink.runtime.scheduler.DefaultScheduler.handleGlobalFailure(DefaultScheduler.java:299)

at org.apache.flink.runtime.operators.coordination.OperatorCoordinatorHolder$LazyInitializedCoordinatorContext.lambda$failJob$0(OperatorCoordinatorHolder.java:635)

at org.apache.flink.runtime.rpc.akka.AkkaRpcActor.lambda$handleRunAsync$4(AkkaRpcActor.java:453)

at org.apache.flink.runtime.concurrent.akka.ClassLoadingUtils.runWithContextClassLoader(ClassLoadingUtils.java:68)

at org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRunAsync(AkkaRpcActor.java:453)

at org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcMessage(AkkaRpcActor.java:218)

at org.apache.flink.runtime.rpc.akka.FencedAkkaRpcActor.handleRpcMessage(FencedAkkaRpcActor.java:84)

at org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleMessage(AkkaRpcActor.java:168)

at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:24)

at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:20)

at scala.PartialFunction.applyOrElse(PartialFunction.scala:123)

at scala.PartialFunction.applyOrElse$(PartialFunction.scala:122)

at akka.japi.pf.UnitCaseStatement.applyOrElse(CaseStatements.scala:20)

at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:171)

at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:172)

at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:172)

at akka.actor.Actor.aroundReceive(Actor.scala:537)

at akka.actor.Actor.aroundReceive$(Actor.scala:535)

at akka.actor.AbstractActor.aroundReceive(AbstractActor.scala:220)

at akka.actor.ActorCell.receiveMessage(ActorCell.scala:580)

at akka.actor.ActorCell.invoke(ActorCell.scala:548)

at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:270)

at akka.dispatch.Mailbox.run(Mailbox.scala:231)

at akka.dispatch.Mailbox.exec(Mailbox.scala:243)

at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)

at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)

at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)

at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

Caused by: org.apache.flink.util.FlinkException: Global failure triggered by OperatorCoordinator for 'Source: products[7] -> DropUpdateBefore[8] -> ConstraintEnforcer[9] -> Sink: sink_products[9]' (operator cbc357ccb763df2852fee8c4fc7d55f2).

at org.apache.flink.runtime.operators.coordination.OperatorCoordinatorHolder$LazyInitializedCoordinatorContext.failJob(OperatorCoordinatorHolder.java:617)

at org.apac"