大数据“重磅炸弹”：实时计算框架 Flink_course

Apache Flink 是一款面向数据流处理和批处理的可分布式的新一代大数据实时处理引擎，简直是大数据中的“重磅炸弹”。对于大数据开发者来说，实时计算一时爽，一直实时计算一直爽；对于有实时计算场景需求的后端开发也可以了解一下。 本场 Chat 首先会分析一下公司常见的实时计算场景需求有哪些，然后对实时采集、实时计算和实时存储做了详细地阐述，帮助大家理解该如何让整个流程做到实时处理。本场 Chat 你将学到如下内容： 1. 了解公司常见实时计算场景需求 2. 数据实时采集 3. 数据实时计算 4. 数据实时存储 5. 知道实时计算和离线计算区别和特点 6. 使用实时数据流面临的挑战 7. 了解实时计算框架 Flink *当前内容版权归码字科技所有并授权显示，盗版必究。[阅读原文](http://gitbook.cn/gitchat/activity/5ca332d3d021d11a4ec5b457)*

Flink local模式下，运行Flink自带的jar包一直报错_course

Flink local模式下，运行Flink自带的jar包一直报错 启动Flink:  执行： bin/flink run examples/streaming/SocketWindowWordCount.jar --port 8888 利用nc -lk 8888模拟socket 输入，然后会报错，并且页面也进不去了 前台页面显示：  后台报错内容： ``` org.apache.flink.client.program.ProgramInvocationException: Could not retrieve the execution result. (JobID: f2ee89e0ed991f22ed9eaec00edfd789) at org.apache.flink.client.program.rest.RestClusterClient.submitJob(RestClusterClient.java:261) at org.apache.flink.client.program.ClusterClient.run(ClusterClient.java:486) at org.apache.flink.streaming.api.environment.StreamContextEnvironment.execute(StreamContextEnvironment.java:66) at org.apache.flink.streaming.examples.socket.SocketWindowWordCount.main(SocketWindowWordCount.java:92) 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:483) at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:529) at org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:421) at org.apache.flink.client.program.ClusterClient.run(ClusterClient.java:426) at org.apache.flink.client.cli.CliFrontend.executeProgram(CliFrontend.java:816) at org.apache.flink.client.cli.CliFrontend.runProgram(CliFrontend.java:290) at org.apache.flink.client.cli.CliFrontend.run(CliFrontend.java:216) at org.apache.flink.client.cli.CliFrontend.parseParameters(CliFrontend.java:1053) at org.apache.flink.client.cli.CliFrontend.lambda$main$11(CliFrontend.java:1129) at org.apache.flink.client.cli.CliFrontend$$Lambda$1/1977310713.call(Unknown Source) at org.apache.flink.runtime.security.HadoopSecurityContext$$Lambda$2/1169474473.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:422) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1754) at org.apache.flink.runtime.security.HadoopSecurityContext.runSecured(HadoopSecurityContext.java:41) at org.apache.flink.client.cli.CliFrontend.main(CliFrontend.java:1129) Caused by: org.apache.flink.runtime.client.JobSubmissionException: Failed to submit JobGraph. at org.apache.flink.client.program.rest.RestClusterClient.lambda$submitJob$8(RestClusterClient.java:380) at org.apache.flink.client.program.rest.RestClusterClient$$Lambda$11/256346753.apply(Unknown Source) at java.util.concurrent.CompletableFuture$ExceptionCompletion.run(CompletableFuture.java:1246) at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:193) at java.util.concurrent.CompletableFuture.internalComplete(CompletableFuture.java:210) at java.util.concurrent.CompletableFuture$ThenApply.run(CompletableFuture.java:723) at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:193) at java.util.concurrent.CompletableFuture.internalComplete(CompletableFuture.java:210) at java.util.concurrent.CompletableFuture$ThenCopy.run(CompletableFuture.java:1333) at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:193) at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:2361) at org.apache.flink.runtime.concurrent.FutureUtils.lambda$retryOperationWithDelay$5(FutureUtils.java:203) at org.apache.flink.runtime.concurrent.FutureUtils$$Lambda$21/100819684.accept(Unknown Source) at java.util.concurrent.CompletableFuture$WhenCompleteCompletion.run(CompletableFuture.java:1298) at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:193) at java.util.concurrent.CompletableFuture.internalComplete(CompletableFuture.java:210) at java.util.concurrent.CompletableFuture$ThenCopy.run(CompletableFuture.java:1333) at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:193) at java.util.concurrent.CompletableFuture.internalComplete(CompletableFuture.java:210) at java.util.concurrent.CompletableFuture$AsyncCompose.exec(CompletableFuture.java:626) at java.util.concurrent.CompletableFuture$Async.run(CompletableFuture.java:428) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: org.apache.flink.runtime.rest.util.RestClientException: [Internal server error., <Exception on server side: akka.pattern.AskTimeoutException: Ask timed out on [Actor[akka://flink/user/dispatcher#1680779493]] after [12000 ms]. Sender[null] sent message of type "org.apache.flink.runtime.rpc.messages.LocalFencedMessage". at akka.pattern.PromiseActorRef$$anonfun$1.apply$mcV$sp(AskSupport.scala:604) at akka.actor.Scheduler$$anon$4.run(Scheduler.scala:126) at scala.concurrent.Future$InternalCallbackExecutor$.unbatchedExecute(Future.scala:601) at scala.concurrent.BatchingExecutor$class.execute(BatchingExecutor.scala:109) at scala.concurrent.Future$InternalCallbackExecutor$.execute(Future.scala:599) at akka.actor.LightArrayRevolverScheduler$TaskHolder.executeTask(LightArrayRevolverScheduler.scala:329) at akka.actor.LightArrayRevolverScheduler$$anon$4.executeBucket$1(LightArrayRevolverScheduler.scala:280) at akka.actor.LightArrayRevolverScheduler$$anon$4.nextTick(LightArrayRevolverScheduler.scala:284) at akka.actor.LightArrayRevolverScheduler$$anon$4.run(LightArrayRevolverScheduler.scala:236) at java.lang.Thread.run(Thread.java:745) End of exception on server side>] at org.apache.flink.runtime.rest.RestClient.parseResponse(RestClient.java:350) at org.apache.flink.runtime.rest.RestClient.lambda$submitRequest$3(RestClient.java:334) at org.apache.flink.runtime.rest.RestClient$$Lambda$31/1522310222.apply(Unknown Source) at java.util.concurrent.CompletableFuture$AsyncCompose.exec(CompletableFuture.java:604) ... 4 more ``` 网上搜了一下，添加了这几个参数还是有问题： ``` akka.ask.timeout: 60 s web.timeout: 12000 taskmanager.host: localhost ``` 有人遇到过吗？