錯誤資訊：
2014-01-01 23:07:09,365 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: 0.0.0.0/0.0.0.0:8031. Already tried 9 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
2014-01-01 23:07:09,387 ERROR org.apache.hadoop.yarn.service.CompositeService: Error starting services org.apache.hadoop.yarn.server.nodemanager.NodeManager
org.apache.avro.AvroRuntimeException: java.lang.reflect.UndeclaredThrowableException
at org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl.start(NodeStatusUpdaterImpl.java:159)
at org.apache.hadoop.yarn.service.CompositeService.start(CompositeService.java:68)
at org.apache.hadoop.yarn.server.nodemanager.NodeManager.start(NodeManager.java:196)
at org.apache.hadoop.yarn.server.nodemanager.NodeManager.initAndStartNodeManager(NodeManager.java:329)
at org.apache.hadoop.yarn.server.nodemanager.NodeManager.main(NodeManager.java:351)
Caused by: java.lang.reflect.UndeclaredThrowableException
at org.apache.hadoop.yarn.exceptions.impl.pb.YarnRemoteExceptionPBImpl.unwrapAndThrowException(YarnRemoteExceptionPBImpl.java:135)
at org.apache.hadoop.yarn.server.api.impl.pb.client.ResourceTrackerPBClientImpl.registerNodeManager(ResourceTrackerPBClientImpl.java:61)
at org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl.registerWithRM(NodeStatusUpdaterImpl.java:208)
at org.apache.hadoop.yarn.server.nodemanager.NodeStatusUpdaterImpl.start(NodeStatusUpdaterImpl.java:155)
... 4 more
Caused by: com.google.protobuf.ServiceException: java.net.ConnectException: Call From slave2.localdomain/127.0.0.1 to 0.0.0.0:8031 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused
at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:212)
at $Proxy24.registerNodeManager(Unknown Source)
at org.apache.hadoop.yarn.server.api.impl.pb.client.ResourceTrackerPBClientImpl.registerNodeManager(ResourceTrackerPBClientImpl.java:59)
... 6 more
Caused by: java.net.ConnectException: Call From slave2.localdomain/127.0.0.1 to 0.0.0.0:8031 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:782)
at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:729)
at org.apache.hadoop.ipc.Client.call(Client.java:1242)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:202)
... 8 more
Caused by: java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:692)
at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:207)
at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:528)
at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:492)
at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:510)
at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:604)
at org.apache.hadoop.ipc.Client$Connection.access$2100(Client.java:252)
at org.apache.hadoop.ipc.Client.getConnection(Client.java:1291)
at org.apache.hadoop.ipc.Client.call(Client.java:1209)
... 9 more


hadoop版本：
解決辦法：修改hdfs-site.xml，新增如下內容：


     <property>
                <name>dfs.secondary.http.address</name>
                <value>cloud3:50090</value>
     </property>


 
參考文章：

http://blog.csdn.net/darxin/article/details/5308075
http://blog.csdn.net/bamuta/article/details/12995139
http://my.oschina.net/leejun2005/blog/82599
http://chinahadoop.net/thread-5238-1-1.html
http://stackoverflow.com/questions/20586920/hadoop-connecting-to-resourcemanager-failed
http://hadoop.apache.org/docs/current/hadoop-yarn/hadoop-yarn-common/yarn-default.xml
http://dongxicheng.org/mapreduce-nextgen/hadoop-yarn-install/
http://www.ibm.com/developerworks/cn/opensource/os-cn-hadoop-yarn/
http://slaytanic.blog.51cto.com/2057708/1101111
Hadoop配置項整理(hdfs-site.xml)：
https://hadoop.apache.org/docs/current2/hadoop-project-dist/