namenode 启动不起来，其他都可以了，很奇怪

各位大虾好：
       今天非常郁闷，把主机名都改简单了，重新把Master里的hadoop 复制到 slavers，重新格式化了，下面 两个命令
/usr/hadoop/bin/hadoop namenode -format
/usr/hadoop/bin/hdfs namenode -format

后面去启动hadoop,好下情况，（namenode，还是起不来）

master执行

[hadoop@M1 hadoop]$ jps
32170 Jps
[hadoop@M1 hadoop]$ /usr/hadoop/sbin/start-dfs.sh
15/05/16 21:12:02 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Starting namenodes on [M1]
M1: starting namenode, logging to /usr/hadoop/logs/hadoop-hadoop-namenode-M1.out
S2: starting datanode, logging to /usr/hadoop/logs/hadoop-hadoop-datanode-S2.out
S1: starting datanode, logging to /usr/hadoop/logs/hadoop-hadoop-datanode-S1.out
Starting secondary namenodes [S1]
S1: starting secondarynamenode, logging to /usr/hadoop/logs/hadoop-hadoop-secondarynamenode-S1.out
15/05/16 21:12:32 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
[hadoop@M1 hadoop]$ jps
32604 Jps
[hadoop@M1 hadoop]$ vi /usr/hadoop/logs/hadoop-hadoop-namenode-M1.log
        at org.apache.hadoop.ipc.Server.bind(Server.java:408)
        ... 13 more
2015-05-16 21:01:38,313 INFO org.apache.hadoop.util.ExitUtil: Exiting with status 1
2015-05-16 21:01:38,394 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at M1/127.0.0.1
************************************************************/
2015-05-16 21:12:05,673 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG:   host = M1/127.0.0.1
STARTUP_MSG:   args = []
STARTUP_MSG:   version = 2.7.0
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@slaver1执行
[hadoop@S1 ~]$ jps
3779 Jps
3719 SecondaryNameNode
3627 DataNode
[hadoop@S1 ~]$ vi /usr/hadoop/logs/hadoop-hadoop-datanode-S1.log
2015-05-16 21:01:32,907 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting DataNode
STARTUP_MSG:   host = S1/127.0.0.1
STARTUP_MSG:   args = []
STARTUP_MSG:   version = 2.7.0
@
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slaver2执行
[hadoop@S2 ~]$ jps
3808 DataNode
3889 Jps
[hadoop@S2 ~]$ vi /usr/hadoop/logs/hadoop-hadoop-datanode-S2.log
2015-05-16 20:56:53,579 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting DataNode
STARTUP_MSG:   host = S2/127.0.0.1
STARTUP_MSG:   args = []
STARTUP_MSG:   version = 2.7.0
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这个是什么原因呢？弄了我好久还是不行呀

  host = M1/127.0.0.1

这里应该不对，还有检查配置文件，下面是一个例子：




更多参考hadoop（2.x）以hadoop2.2为例完全分布式最新高可靠安装文档

还有警告
hadoop出现hadoop2.X部署警告： Unable to load native-hadoop library 总结

1、是否进行了多次格式化
2、 /etc/hosts是否在各个节点上一致