Flink-web上运行多jar失败问题

将应用打成jar包后通过Flink web上传到Flink Server。然后，找到你提交的job，输入如下的启动参数，提交submit即可：

成功运行的job的页面如下图，如果下图框框中的指标一直在转圈圈，那么很有可能是因为你运行了其他的job，导致Available Task Slots不够用了。

默认的Flink的Slots配置是1，当出现任务插槽不够用时，上图圈圈转一会就会失败，然后打开job manager 点击log就可以看到job因为没有可用的任务插槽而失败了。

org.apache.flink.runtime.jobmanager.scheduler.NoResourceAvailableException: Could not allocate all requires slots within timeout of 300000 ms. Slots required: 2, slots allocated: 0
	at org.apache.flink.runtime.executiongraph.ExecutionGraph.lambda$scheduleEager$3(ExecutionGraph.java:991)
	at java.util.concurrent.CompletableFuture.uniExceptionally(CompletableFuture.java:870)
	at java.util.concurrent.CompletableFuture$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.concurrent.FutureUtils$ResultConjunctFuture.handleCompletedFuture(FutureUtils.java:535)
	at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760)
	at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:736)
	at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)
	at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1977)
	at org.apache.flink.runtime.concurrent.FutureUtils$1.onComplete(FutureUtils.java:772)
	at akka.dispatch.OnComplete.internal(Future.scala:258)
	at akka.dispatch.OnComplete.internal(Future.scala:256)
	at akka.dispatch.japi$CallbackBridge.apply(Future.scala:186)
	at akka.dispatch.japi$CallbackBridge.apply(Future.scala:183)
	at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:36)
	at org.apache.flink.runtime.concurrent.Executors$DirectExecutionContext.execute(Executors.java:83)
	at scala.concurrent.impl.CallbackRunnable.executeWithValue(Promise.scala:44)
	at scala.concurrent.impl.Promise$DefaultPromise.tryComplete(Promise.scala:252)
	at akka.pattern.PromiseActorRef.$bang(AskSupport.scala:534)
	at akka.pattern.PipeToSupport$PipeableFuture$$anonfun$pipeTo$1.applyOrElse(PipeToSupport.scala:20)
	at akka.pattern.PipeToSupport$PipeableFuture$$anonfun$pipeTo$1.applyOrElse(PipeToSupport.scala:18)
	at scala.concurrent.Future$$anonfun$andThen$1.apply(Future.scala:436)
	at scala.concurrent.Future$$anonfun$andThen$1.apply(Future.scala:435)
	at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:36)
	at akka.dispatch.BatchingExecutor$AbstractBatch.processBatch(BatchingExecutor.scala:55)
	at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply$mcV$sp(BatchingExecutor.scala:91)
	at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91)
	at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91)
	at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:72)
	at akka.dispatch.BatchingExecutor$BlockableBatch.run(BatchingExecutor.scala:90)
	at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:39)
	at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:415)
	at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
	at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
	at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
	at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

上面的问题可以通过修改conf/flink-conf.yaml中的taskmanager.numberOfTaskSlots来设置，具体指单个TaskManager可以运行的并行操作员或用户功能实例的数量。如果此值大于1，则单个TaskManager将获取函数或运算符的多个实例。这样，TaskManager可以使用多个CPU内核，但同时，可用内存在不同的操作员或功能实例之间划分。此值通常与TaskManager的计算机具有的物理CPU核心数成比例（例如，等于核心数，或核心数的一半）。当然，如果你修改了配置文件，Flink Server是需要重启的。重启成功后，可以在大盘看到，如下图箭头：