1. 如果遇到Hadoop没有启动的情况，先检查
$ jps
1700 Bootstrap
16137 TaskTracker
29691 NameNode
31026 DataNode
6809 Jps
1681 Bootstrap
1662 Manager
32761 JobTracker
如果少了什么就需要启动相应的service. 可以在这里找到 wget http://169.254.169.254/latest/user-data。
service hadoop-namenode start
service hadoop-datanode start
service hadoop-jobtracker start
service hadoop-tasktracker start
service zookeeper-server start
service hbase-master start
service hbase-regionserver start
service hbase-thrift start
检查hdfs是否与每个datanode连好，
sudo -u hdfs hadoop dfsadmin -report
sudo -u hdfs hadoop dfsadmin -report | grep Name