flink 使用问题记录

1. 提交flink任务：

Process finished with exit code 130
org.apache.flink.runtime.rest.NotFoundException: Job 6fe06e87852fa7a12e2276e2876c067a 
not found at org.apache.flink.runtime.rest.handler.job.AbstractExecutionGraphHandler.lambda$handleRequest$1(AbstractExecutionGraphHandler.java:89) at java.util.concurrent.CompletableFuture.uniExceptionally(CompletableFuture.java:870) at java.util.concurrent.CompletableFuture$UniExceptionally.tryFire(CompletableFuture.java:852) 
at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474) 
at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1977) 
at org.apache.flink.runtime.rest.handler.legacy.DefaultExecutionGraphCache.lambda$getExeakka.actor.ActorCell.invoke(ActorCell.scala:561) at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:258) 
at akka.dispatch.Mailbox.run(Mailbox.scala:225) 
at akka.dispatch.Mailbox.exec(Mailbox.scala:235) ... 4 more

提交flink任务失败，与打的jar包有关系，检查resources中的配置文件是否打入jar包。

2. java.lang.ClassCastException: cannot assign instance of org.apache.commons.collections.map.linkedMap to field 

 org.apache.flink.streaming.runtime.tasks.StreamTaskException: Cannot instantiate user function.
	at org.apache.flink.streaming.api.graph.StreamConfig.getStreamOperatorFactory(StreamConfig.java:275)
	at org.apache.flink.streaming.runtime.tasks.OperatorChain.(OperatorChain.java:126)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.beforeInvoke(StreamTask.java:459)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:526)
	at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:721)
	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:546)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassCastException: cannot assign instance of org.apache.commons.collections.map.linkedMap to field org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerbase.pendingOffsetsToCommit of type org.apache.commons.collections.map.linkedMap in instance of org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer010
	at java.io.ObjectStreamClass$FieldReflector.setObjFieldValues(ObjectStreamClass.java:2287)
	at java.io.ObjectStreamClass.setObjFieldValues(ObjectStreamClass.java:1417)
	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2293)
	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2211)
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2069)
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1573)
	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2287)

报这个错误，网上查都是说和flink的类加载机制有关系，需要修改配置文件；

Kafka库与Flink的反向类加载方法不兼容，修改 conf/flink-conf.yaml 并重启Flink
classloader.resolve-order: parent-first

背景：集群里面原来提交jar包是没有问题的，修改代码后重新打了一个包(将项目达成一个jar包,用maven-shade-pugin插件)，提交任务就报这种错误。

通过对比生产环境和测试环境中flink/lib 目录下的jar包，发现项目依赖的jar包都在测试环境lib 目录下，将依赖的jar包删除，然后重新提交，则能提交成功。

解决方式： 进入flink安装目录/lib ,将项目依赖的一些jar包删除（要保留lib下原有的jar包），避免有冲突。