Hadoop分布式时远程Datanode无法启动的解决

问题的基本现象:
在测试Hadoop的分布式环境搭建时,在namenode启动时信息如下:

[michael@shnap hadoop]$ bin/start-all.sh
starting namenode, logging to /home/michael/hadoop/bin/../logs/hadoop-michael-namenode-shnap.out
192.168.8.148: starting datanode, logging to /home/michael/hadoop/bin/../logs/hadoop-michael-datanode-michael-VirtualBox.out
192.168.8.150: starting secondarynamenode, logging to /home/michael/hadoop/bin/../logs/hadoop-michael-secondarynamenode-shnap.out
starting jobtracker, logging to /home/michael/hadoop/bin/../logs/hadoop-michael-jobtracker-shnap.out
192.168.8.148: starting tasktracker, logging to /home/michael/hadoop/bin/../logs/hadoop-michael-tasktracker-michael-VirtualBox.out
[michael@shnap hadoop]$ jps
30045 JobTracker
29973 SecondaryNameNode
29813 NameNode
30136 Jps

从上述信息可见namenode中的进程信息正常
在datanode查看的信息如下:

michael@michael-VirtualBox:~/hadoop$ jps
15934 TaskTracker
15978 Jps

从上述信息可见datanode中的进程就不正常了,明显少了DataNode

解决办法如下
先检查conf/masters 和conf/slaves文件,确保配置没错。
然后把所有节点的hadoop.tmp.dir指定的文件夹下的内容全部删掉
重新在master设备上执行启动程序

再在datanode查看的信息就正常了如下:

michael@michael-VirtualBox:~/hadoop$ jps
16467 Jps
16289 DataNode
16429 TaskTracker

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