java - Hadoop 纱作业 : Wrong FS

Question

我用一个 vagrant box 安装了一个 cloudera 集群。启动以下示例时出现错误:

 hadoop jar /usr/lib/hadoop-mapreduce/hadoop-mapreduce-examples.jar grep input output23 'dfs[a-z.]+'

我去/var/log/hadoop-yarn查看了日志。有几个日志文件，在yarn-yarn-nodemanager-cdh-master.log中，有如下stackstrace:

2015-06-17 11:42:42,398 INFO SecurityLogger.org.apache.hadoop.ipc.Server: Auth successful for appattempt_1434535025160_0001_000001 (auth:SIMPLE)
2015-06-17 11:42:42,597 INFO  org.apache.hadoop.yarn.server.nodemanager.containermanager.ContainerManagerImpl: Start request for container_1434535025160_0001_01_
000001 by user vagrant
2015-06-17 11:42:42,762 INFO org.apache.hadoop.yarn.server.nodemanager.containermanager.ContainerManagerImpl: Creating a new application reference for app appli
cation_1434535025160_0001
2015-06-17 11:42:42,776 INFO org.apache.hadoop.yarn.server.nodemanager.containermanager.application.Application: Application application_1434535025160_0001 tran
sitioned from NEW to INITING
2015-06-17 11:42:42,778 INFO org.apache.hadoop.yarn.server.nodemanager.NMAuditLogger: USER=vagrant      IP=10.10.50.5   OPERATION=Start Container Request
TARGET=ContainerManageImpl      RESULT=SUCCESS  APPID=application_1434535025160_0001    CONTAINERID=container_1434535025160_0001_01_000001
2015-06-17 11:42:43,997 FATAL org.apache.hadoop.yarn.event.AsyncDispatcher: Error in dispatcher thread
java.lang.IllegalArgumentException: Wrong FS: hdfs://var/log/hadoop-yarn, expected: hdfs://cdh-master:8020
        at org.apache.hadoop.fs.FileSystem.checkPath(FileSystem.java:645)
        at org.apache.hadoop.hdfs.DistributedFileSystem.getPathName(DistributedFileSystem.java:193)
        at org.apache.hadoop.hdfs.DistributedFileSystem.access$000(DistributedFileSystem.java:105)
        at org.apache.hadoop.hdfs.DistributedFileSystem$18.doCall(DistributedFileSystem.java:1128)
        at org.apache.hadoop.hdfs.DistributedFileSystem$18.doCall(DistributedFileSystem.java:1124)
        at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
        at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1124)
        at org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.LogAggregationService.verifyAndCreateRemoteLogDir(LogAggregationService.java:192)
        at org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.LogAggregationService.initApp(LogAggregationService.java:319)
        at org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.LogAggregationService.handle(LogAggregationService.java:443)
        at org.apache.hadoop.yarn.server.nodemanager.containermanager.logaggregation.LogAggregationService.handle(LogAggregationService.java:67)
        at org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:173)
        at org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:106)
        at java.lang.Thread.run(Thread.java:744)
2015-06-17 11:42:44,000 INFO org.apache.hadoop.yarn.server.nodemanager.containermanager.application.Application: Adding container_1434535025160_0001_01_000001 t
o application application_1434535025160_0001
2015-06-17 11:42:44,001 INFO org.apache.hadoop.yarn.event.AsyncDispatcher: Exiting, bbye..
2015-06-17 11:42:44,034 INFO org.mortbay.log: Stopped HttpServer2$SelectChannelConnectorWithSafeStartup@0.0.0.0:8042
2015-06-17 11:42:44,035 INFO org.apache.hadoop.yarn.server.nodemanager.containermanager.ContainerManagerImpl: Applications still running : [application_14345350

我见过这个错误

java.lang.IllegalArgumentException: Wrong FS:
hdfs://var/log/hadoop-yarn, expected: hdfs://cdh-master:8020

在以下帖子中:Failed to start Jobtracker and Tasktracker in CDH pseudo cluster ，但这对我帮助不大。

有没有人有想法？

谢谢

Answer 1

将 yarn-site.xml 配置文件中的属性 yarn.nodemanager.remote-app-log-dir 更改为:

<property>  
  <name>yarn.nodemanager.remote-app-log-dir</name>
  <value>hdfs://cdh-master:8020/var/log/hadoop-yarn/apps</value>
</property>

或

<property>  
  <name>yarn.nodemanager.remote-app-log-dir</name>
  <value>/var/log/hadoop-yarn/apps</value>
</property>

第二个选项将使用无论如何都应设置为 HDFS 的默认文件系统。