hadoop启动datanode失败的错误原因
日志：hadoop-cdhuser-datanode-zabhb000.log内容
2015-01-16 11:38:29,272 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: registered UNIX signal handlers for [TERM, HUP, INT]
2015-01-16 11:38:30,403 INFO org.apache.hadoop.metrics2.impl.MetricsConfig: loaded properties from hadoop-metrics2.properties
2015-01-16 11:38:30,468 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s).
2015-01-16 11:38:30,468 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: DataNode metrics system started
2015-01-16 11:38:30,471 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: File descriptor passing is enabled.
2015-01-16 11:38:30,473 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Configured hostname is zabhb000
2015-01-16 11:38:30,474 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Starting DataNode with maxLockedMemory = 0
2015-01-16 11:38:30,495 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Opened streaming server at /0.0.0.0:50010
2015-01-16 11:38:30,498 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Balancing bandwith is 41943040 bytes/s
2015-01-16 11:38:30,499 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Waiting for threadgroup to exit, active threads is 0
2015-01-16 11:38:30,499 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Shutdown complete.
2015-01-16 11:38:30,500 FATAL org.apache.hadoop.hdfs.server.datanode.DataNode: Exception in secureMain
java.io.IOException: the path component: '/u06/cdhuser/data/hadoop_dfs' is group-writable, and the group is not root. Its permissions are 0775, and it is owned by gid
501. Please fix this or select a different socket path.
at org.apache.hadoop.net.unix.DomainSocket.validateSocketPathSecurity0(Native Method)
at org.apache.hadoop.net.unix.DomainSocket.bindAndListen(DomainSocket.java:189)
at org.apache.hadoop.hdfs.net.DomainPeerServer.<init>(DomainPeerServer.java:42)
at org.apache.hadoop.hdfs.server.datanode.DataNode.getDomainPeerServer(DataNode.java:611)
at org.apache.hadoop.hdfs.server.datanode.DataNode.initDataXceiver(DataNode.java:577)
at org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:773)
at org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:292)
at org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1893)
at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1780)
at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1827)
at org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:2003)
at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:2027)
2015-01-16 11:38:30,504 INFO org.apache.hadoop.util.ExitUtil: Exiting with status 1
2015-01-16 11:38:30,505 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down DataNode at zabhb000/10.10.1.127
错误原因：
我的hdfs-site.xml配置
<property>
<name>dfs.domain.socket.path</name>
<value>/u06/cdhuser/data/hadoop_dfs/dn_socket_handler</value>
</property>
而/u06/是/home/目录下的软连接目录，ln -sf 生成
解决方法： 安装hadoop在软连接生成的目录，或者 修改/u06/的权限。
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