hadoop2.6.0控制集群节点个数

要控制集群节点的个数,只需要更改主控节点(master)上Hadoop安装目录下面./etc/hadoop下面的slaves文件,通过添加或删除slave的ip或ip映射的名字,然后在主控节点执行start-all.sh就可以了.

1.slaves里面放一个slave

slave1
启动集群后,查看状态:

hadoop@master:/opt/hadoop$ jps
2735 NameNode
3389 Jps
3103 ResourceManager

2948 SecondaryNameNode

hadoop@master:/opt/hadoop$ bin/hdfs dfsadmin -report
Configured Capacity: 72812462080 (67.81 GB)
Present Capacity: 64238071808 (59.83 GB)
DFS Remaining: 64236359680 (59.82 GB)
DFS Used: 1712128 (1.63 MB)
DFS Used%: 0.00%
Under replicated blocks: 8
Blocks with corrupt replicas: 0
Missing blocks: 0

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