[CM] Yarn Node Manager 추가 시 ava.lang.IllegalArgumentException: java.net.UnknownHostException: HOSTNAME

yarn 에 들어가있는 어플리케이션이 하나도 안돌고 대기중이어서 Resorce Manager 역할 로그를 봤더니 아래와 같은 에러메시지 확인..

Error trying to assign container token and NM token to an updated container CONTAINER_NAME
java.lang.IllegalArgumentException: java.net.UnknownHostException: HOST_NAME
at org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:445)
at org.apache.hadoop.yarn.server.utils.BuilderUtils.newContainerToken(BuilderUtils.java:310)
at org.apache.hadoop.yarn.server.resourcemanager.security.RMContainerTokenSecretManager.createContainerToken(RMContainerTokenSecretManager.java:256)
at org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerApplicationAttempt.updateContainerAndNMToken(SchedulerApplicationAttempt.java:651)
at org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerApplicationAttempt.pullNewlyAllocatedContainers(SchedulerApplicationAttempt.java:729)
at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.allocate(FairScheduler.java:942)
at org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl$AMContainerAllocatedTransition.transition(RMAppAttemptImpl.java:1141)
at org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl$AMContainerAllocatedTransition.transition(RMAppAttemptImpl.java:1133)
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$500(StateMachineFactory.java:46)
at org.apache.hadoop.yarn.state.StateMachineFactory$InternalStateMachine.doTransition(StateMachineFactory.java:487)
at org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl.handle(RMAppAttemptImpl.java:908)
at org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl.handle(RMAppAttemptImpl.java:116)
at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$ApplicationAttemptEventDispatcher.handle(ResourceManager.java:969)
at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$ApplicationAttemptEventDispatcher.handle(ResourceManager.java:950)
at org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:197)
at org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:126)
at java.lang.Thread.run(Thread.java:748)

서버를 추가했는데 저 HOST_NAME 을 못찾겠다는 거였다.

Resource manager 역할을 하는 서버의 호스트파일에 추가한 NM 서버 정보 등록 후 해결했음