hadoop中启动datanode或者namenode没有启动起来
hadoop中启动datanode或者namenode没有启动起来hadoop的配置是参考这篇教程的http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-single-node-cluster/
hadoop@ubuntu:~$ hadoop/bin/start-all.sh
hadoop@ubuntu:~$ jps
12181 Jps
11984 JobTracker
12132 TaskTracker
11557 SecondaryNameNode
hadoop@ubuntu:~$ hadoop/bin/stop-all.sh
stopping jobtracker
localhost: no tasktracker to stop
no namenode to stop
localhost: no datanode to stop
localhost: stopping secondarynamenode
下面的方法：
1、先运行stop-all.sh
2、格式化namdenode，不过在这之前要先删除原目录，即core-site.xml下配置的hadoop.tmp.dir所指向的目录，删除后切记要重新建立配置的空目录，然后运行hadoop namenode -format
3、运行start-all.sh
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