Hadoop中常用的一些命名
hadoop fsck / -files -blocks -locations DEPRECATED: Use of this script to execute hdfs command is deprecated.Instead use the hdfs command for it.
15/02/05 05:20:55 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java> Connecting to namenode via http://10.9.214.151:50070
FSCK started by hadoop (auth:SIMPLE) from /10.9.214.15 for path / at Thu Feb 05 05:20:57 UTC 2015
/
Status: HEALTHY
Total> Total dirs: 1
Total files: 0
Total symlinks: 0
Total blocks (validated): 0
Minimally replicated blocks: 0
Over-replicated blocks: 0
Under-replicated blocks: 0
Mis-replicated blocks: 0
Default replication factor: 2
Average block replication: 0.0
Corrupt blocks: 0
Missing replicas: 0
Number of data-nodes: 3
Number of racks: 1
FSCK ended at Thu Feb 05 05:20:57 UTC 2015 in 3 milliseconds
hadoop dfsadmin -report safemode是hdfs cluster在启动的时候所处于的状态，启动是nn要检查所有block的位置状态等信息，启动完成后就退出safemode。
hadoop dfsadmin -safemode enter 启动nodemanager datanode
yarn-daemon.sh stop|start nodemanager
hadoop-daemon.sh stop|start datanode
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