啟動

start-scala-shell.sh local

下面是benv和senv的例子[1]

flnk shell變量	用途	環境變量的作用
benv	DataSet	輸出到文件中
senv	DataStream	打印到屏幕上

#############################################################################################

DataSet[1]

val text = benv.fromElements("To be, or not to be,--that is the question:--","Whether 'tis nobler in the mind to suffer","The slings and arrows of outrageous fortune","Or to take arms against a sea of troubles,") val counts = text val counts = text.flatMap { _.toLowerCase.split("\\W+") }.map { (_, 1) }.groupBy(0).sum(1) counts.print() counts.writeAsText("/tmp/out1") benv.execute("batch test")

(Python3.6) appleyuchi@Desktop:~$ cd /tmp/out1
(Python3.6) appleyuchi@Desktop:out1$ ls
1 ?2 ?3 ?4
(Python3.6) appleyuchi@Desktop:out1$ cat 1
(and,1)
(arrows,1)
(be,2)
(is,1)
(nobler,1)
(of,2)
(Python3.6) appleyuchi@Desktop:out1$ cat 2
(a,1)
(in,1)
(mind,1)
(or,2)
(slings,1)
(suffer,1)
(Python3.6) appleyuchi@Desktop:out1$ cat 3
(against,1)
(arms,1)
(not,1)
(outrageous,1)
(sea,1)
(the,3)
(tis,1)
(troubles,1)
(whether,1)
(Python3.6) appleyuchi@Desktop:out1$ cat 4
(fortune,1)
(question,1)
(take,1)
(that,1)
(to,4)
?

#####################################################################################################

DataStream[1]

val textStreaming = senv.fromElements("To be, or not to be,--that is the question:--") val countsStreaming = textStreaming.flatMap { _.toLowerCase.split("\\W+") }.map { (_, 1) }.keyBy(0).sum(1) countsStreaming.print() senv.execute("Streaming Wordcount") (to,1) (be,1) (or,1) (not,1) (to,2) (be,2) (that,1) (is,1) (the,1) (question,1)

注意，上面這個如果沒有countsStreaming.print(),senv.execute("Streaming Wordcount")就無法輸出結果

?

#####################################-附錄-報錯處理1######################################

如果出現報錯:

Exception in thread "main" org.apache.flink.util.FlinkException: Could not create the DispatcherResourceManagerComponent.
單機模式顯然沒啥資源好分配的，肯定是沒關干凈。

(Python3.6) appleyuchi@Desktop:bin$ jps
10065 NodeManager
9346 DataNode
8099 Jps
9882 ResourceManager
9178 NameNode
8010 FlinkShell
5053 FlinkShell

kill -9 8010 5053

然后重啟flink shell即可

#####################################-附錄-報錯處理2######################################

如果出現下面的報錯

scala> senv.execute("My streaming program") org.apache.flink.client.program.ProgramInvocationException: Job failed (JobID: ec2d3e37b4e2be70508f8f9da63ae13b)at org.apache.flink.client.deployment.ClusterClientJobClientAdapter.lambda$null$6(ClusterClientJobClientAdapter.java:112)at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:602)at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:577)at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)at java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:1962)at org.apache.flink.client.program.rest.RestClusterClient.lambda$pollResourceAsync$21(RestClusterClient.java:565)at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760)at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:736)at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)at java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:1962)at org.apache.flink.runtime.concurrent.FutureUtils.lambda$retryOperationWithDelay$8(FutureUtils.java:291)at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760)at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:736)at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)at java.util.concurrent.CompletableFuture.postFire(CompletableFuture.java:561)at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:929)at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:442)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)at java.lang.Thread.run(Thread.java:748) Caused by: org.apache.flink.runtime.client.JobExecutionException: Job execution failed.at org.apache.flink.runtime.jobmaster.JobResult.toJobExecutionResult(JobResult.java:147)at org.apache.flink.client.deployment.ClusterClientJobClientAdapter.lambda$null$6(ClusterClientJobClientAdapter.java:110)... 19 more Caused by: org.apache.flink.runtime.JobException: Recovery is suppressed by NoRestartBackoffTimeStrategyat org.apache.flink.runtime.executiongraph.failover.flip1.ExecutionFailureHandler.handleFailure(ExecutionFailureHandler.java:110)at org.apache.flink.runtime.executiongraph.failover.flip1.ExecutionFailureHandler.getFailureHandlingResult(ExecutionFailureHandler.java:76)at org.apache.flink.runtime.scheduler.DefaultScheduler.handleTaskFailure(DefaultScheduler.java:192)at org.apache.flink.runtime.scheduler.DefaultScheduler.maybeHandleTaskFailure(DefaultScheduler.java:186)at org.apache.flink.runtime.scheduler.DefaultScheduler.updateTaskExecutionStateInternal(DefaultScheduler.java:180)at org.apache.flink.runtime.scheduler.SchedulerBase.updateTaskExecutionState(SchedulerBase.java:496)at org.apache.flink.runtime.scheduler.UpdateSchedulerNgOnInternalFailuresListener.notifyTaskFailure(UpdateSchedulerNgOnInternalFailuresListener.java:49)at org.apache.flink.runtime.executiongraph.ExecutionGraph.notifySchedulerNgAboutInternalTaskFailure(ExecutionGraph.java:1703)at org.apache.flink.runtime.executiongraph.Execution.processFail(Execution.java:1252)at org.apache.flink.runtime.executiongraph.Execution.processFail(Execution.java:1220)at org.apache.flink.runtime.executiongraph.Execution.markFailed(Execution.java:1051)at org.apache.flink.runtime.executiongraph.ExecutionVertex.markFailed(ExecutionVertex.java:748)at org.apache.flink.runtime.scheduler.DefaultExecutionVertexOperations.markFailed(DefaultExecutionVertexOperations.java:41)at org.apache.flink.runtime.scheduler.DefaultScheduler.handleTaskDeploymentFailure(DefaultScheduler.java:446)at org.apache.flink.runtime.scheduler.DefaultScheduler.lambda$assignResourceOrHandleError$5(DefaultScheduler.java:433)at java.util.concurrent.CompletableFuture.uniHandle(CompletableFuture.java:822)at java.util.concurrent.CompletableFuture$UniHandle.tryFire(CompletableFuture.java:797)at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1977)at org.apache.flink.runtime.jobmaster.slotpool.SchedulerImpl.lambda$internalAllocateSlot$0(SchedulerImpl.java:168)at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760)at java.util.concurrent.CompletableFuture$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.jobmaster.slotpool.SlotSharingManager$SingleTaskSlot.release(SlotSharingManager.java:726)at org.apache.flink.runtime.jobmaster.slotpool.SlotSharingManager$MultiTaskSlot.release(SlotSharingManager.java:537)at org.apache.flink.runtime.jobmaster.slotpool.SlotSharingManager$MultiTaskSlot.lambda$new$0(SlotSharingManager.java:432)at java.util.concurrent.CompletableFuture.uniHandle(CompletableFuture.java:822)at java.util.concurrent.CompletableFuture$UniHandle.tryFire(CompletableFuture.java:797)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.lambda$forward$21(FutureUtils.java:1065)at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760)at java.util.concurrent.CompletableFuture$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$Timeout.run(FutureUtils.java:999)at org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRunAsync(AkkaRpcActor.java:402)at org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcMessage(AkkaRpcActor.java:195)at org.apache.flink.runtime.rpc.akka.FencedAkkaRpcActor.handleRpcMessage(FencedAkkaRpcActor.java:74)at org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleMessage(AkkaRpcActor.java:152)at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:26)at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:21)at scala.PartialFunction$class.applyOrElse(PartialFunction.scala:123)at akka.japi.pf.UnitCaseStatement.applyOrElse(CaseStatements.scala:21)at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:170)at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:171)at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:171)at akka.actor.Actor$class.aroundReceive(Actor.scala:517)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$WorkQueue.runTask(ForkJoinPool.java:1339)at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)at akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107) Caused by: org.apache.flink.runtime.jobmanager.scheduler.NoResourceAvailableException: Could not allocate the required slot within slot request timeout. Please make sure that the cluster has enough resources.at org.apache.flink.runtime.scheduler.DefaultScheduler.maybeWrapWithNoResourceAvailableException(DefaultScheduler.java:452)... 45 more Caused by: java.util.concurrent.CompletionException: java.util.concurrent.TimeoutExceptionat java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:292)at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:308)at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:593)at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:577)... 25 more Caused by: java.util.concurrent.TimeoutException... 23 more

解決方案是:

$FLINK_HOME/conf/flink-conf.yaml修改如下:

taskmanager.numberOfTaskSlots: 2(這個一般是cpu數量)

parallelism.default: 2

目前感覺是parallelism.default≥taskmanager.numberOfTaskSlots會好些，不然容易報錯。

?

Reference:

[1]Apache Flink 零基礎入門（四）：客戶端操作的 5 種模式

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