错误提示:

The file LOG/STDOUT is not available on the TaskExecutor

场景:

yarn集群模式提交Flink任务时，无法查看日志，数据传输都正常，taskManager的日志无法显示，找不到方法。

F12查看接口报错，

Exception on server side:
org.apache.flink.util.FlinkException: The file LOG is not available on the TaskExecutor.
	at org.apache.flink.runtime.taskexecutor.TaskExecutor.requestFileUploadByFilePath(TaskExecutor.java:1747)
	at org.apache.flink.runtime.taskexecutor.TaskExecutor.requestFileUploadByType(TaskExecutor.java:1006)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcInvocation(AkkaRpcActor.java:284)
	at org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcMessage(AkkaRpcActor.java:199)
	at org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleMessage(AkkaRpcActor.java:152)
	at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:26)
	at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:21)
	at scala.PartialFunction.applyOrElse(PartialFunction.scala:123)
	at scala.PartialFunction.applyOrElse$(PartialFunction.scala:122)
	at akka.japi.pf.UnitCaseStatement.applyOrElse(CaseStatements.scala:21)
	at scala.PartialFunction$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:517)
	at akka.actor.Actor.aroundReceive$(Actor.scala:515)
	at akka.actor.AbstractActor.aroundReceive(AbstractActor.scala:225)
	at akka.actor.ActorCell.receiveMessage(ActorCell.scala:592)
	at akka.actor.ActorCell.invoke(ActorCell.scala:561)
	at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:258)
	at akka.dispatch.Mailbox.run(Mailbox.scala:225)
	at akka.dispatch.Mailbox.exec(Mailbox.scala:235)
	at akka.dispatch.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
	at akka.dispatch.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
	at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
	at akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
	End of exception on server side

flink客户端提交的任务，jobManager中多了两个日志相关参数

没错，就是他俩：

$internal.deployment.config-dir

$internal.yarn.log-config-file

于是手动在程序中参考 YarnLogConfigUtil.discoverLogConfigFile方法设置 $internal.yarn.log-config-file 参数，最终日志成功出现！

如下：

$internal.yarn.log-config-file log4j.properties