hadoop任务执行时,报错

本文解决了一个在Apache Hadoop YARN中出现的调度错误问题,该问题是由于ResourceManager尝试为分配的容器分配token时找不到对应的NodeManager导致。解决方案是在ResourceManager中配置正确的hosts文件,使hostname能够指向正确的NodeManager IP。

2020-11-06 03:42:43,205 ERROR org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerApplicationAttempt: Error trying to assign container token and NM token to an allocated container container_1604647286933_0002_01_000001
java.lang.IllegalArgumentException: java.net.UnknownHostException: k8s-node1
        at org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:378)
        at org.apache.hadoop.yarn.server.utils.BuilderUtils.newContainerToken(BuilderUtils.java:261)
        at org.apache.hadoop.yarn.server.resourcemanager.security.RMContainerTokenSecretManager.createContainerToken(RMContainerTokenSecretManager.java:220)
        at org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerApplicationAttempt.pullNewlyAllocatedContainersAndNMTokens(SchedulerApplicationAttempt.java:456)
        at org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.fica.FiCaSchedulerApp.getAllocation(FiCaSchedulerApp.java:270)
        at org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocate(CapacityScheduler.java:988)
        at org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl$AMContainerAllocatedTransition.transition(RMAppAttemptImpl.java:991)
        at org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl$AMContainerAllocatedTransition.transition(RMAppAttemptImpl.java:983)
        at org.apache.hadoop.yarn.state.StateMachineFactory$MultipleInternalArc.doTransition(StateMachineFactory.java:385)
        at org.apache.hadoop.yarn.state.StateMachineFactory.doTransition(StateMachineFactory.java:302)
        at org.apache.hadoop.yarn.state.StateMachineFactory.access$300(StateMachineFactory.java:46)
        at org.apache.hadoop.yarn.state.StateMachineFactory$InternalStateMachine.doTransition(StateMachineFactory.java:448)
        at org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl.handle(RMAppAttemptImpl.java:808)
        at org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl.handle(RMAppAttemptImpl.java:108)
        at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$ApplicationAttemptEventDispatcher.handle(ResourceManager.java:803)
        at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$ApplicationAttemptEventDispatcher.handle(ResourceManager.java:784)
        at org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:184)
        at org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:110)

 

有时,ResourceManager去找nodeManager的时候,会通过hostname查找具体机器,而非slave文件中的node**                但是修改了对应nodeManager的host还是不能通过node**查找。

这样可以修改ResourceManager的hosts文件   指定hostname也指向node**的机器IP。这样就可以规避了此类问题

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