关于 hadoop-2.2 配置中的 yarn.nodemanager.aux-services 项
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在hadoop-2.0.3-alpha 的配置中,yarn.nodemanager.aux-services项的默认值是“mapreduce.shuffle”,但如果在hadoop-2.2 中继续使用这个值,NodeManager 会启动失败,在logs/yarn-biadmin-nodemanager-hostname.log里会报如下的错:
2014-01-19 22:35:04,309 FATAL org.apache.hadoop.yarn.server.nodemanager.containermanager.AuxServices: Failed to initialize mapreduce.shuffle
java.lang.IllegalArgumentException: The ServiceName: mapreduce.shuffle set in yarn.nodemanager.aux-services is invalid.The valid service name should only contain a-zA-Z0-9_ and can not start with numbers
at com.google.common.base.Preconditions.checkArgument(Preconditions.java:88)
at org.apache.hadoop.yarn.server.nodemanager.containermanager.AuxServices.serviceInit(AuxServices.java:98)
at org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
at org.apache.hadoop.service.CompositeService.serviceInit(CompositeService.java:108)
at org.apache.hadoop.yarn.server.nodemanager.containermanager.ContainerManagerImpl.serviceInit(ContainerManagerImpl.java:218)
at org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
at org.apache.hadoop.service.CompositeService.serviceInit(CompositeService.java:108)
at org.apache.hadoop.yarn.server.nodemanager.NodeManager.serviceInit(NodeManager.java:188)
at org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
at org.apache.hadoop.yarn.server.nodemanager.NodeManager.initAndStartNodeManager(NodeManager.java:338)
at org.apache.hadoop.yarn.server.nodemanager.NodeManager.main(NodeManager.java:386)
解决方案:
将yarn.nodemanager.aux-services项的值改为“mapreduce_shuffle”。
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