Hadoop配置datanode无法连接到master

初次在VM上配置Hadoop，开了三台虚拟机，一个作namenode,jobtracker

另外两台机子作datanode,tasktracker

配置好后，启动集群

通过http://localhost:50700查看cluster状况

Hadoop配置datanode无法连接到master

发现没有datanode

检查结点，发现datanode 进程已经启动，查看datanode机器上的日志

2014-03-01 22:11:17,473 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: Master.hadoop/192.168.128.132:9000. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)

2014-03-01 22:11:18,477 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: Master.hadoop/192.168.128.132:9000. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS) 2014-03-01 22:11:19,481 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: Master.hadoop/192.168.128.132:9000. Already tried 2 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS) 2014-03-01 22:11:20,485 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: Master.hadoop/192.168.128.132:9000. Already tried 3 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)

2014-03-01 22:11:21,489 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: Master.hadoop/192.168.128.132:9000. Already tried 4 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)

发现datanode 无法连接到master ,但是经过尝试，可以ping通，到结点查看，9000端口也处于监听状态，百思不得其解

最终发现core-site.xml 中

    <property>         <name>fs.default.name</name>         <value>hdfs://localhost:9000</value>   </property> 才意识到监听127.0.0.1端口，并不能被外机访问

改为主机名，一切正常

<property>         <name>fs.default.name</name>         <value>hdfs://Master.Hadoop:9000</value>   </property>