$ hadoop job -list
$ hadoop job -kill 1234
$ hadoop fsck /
FSCK started by nange from /127.0.0.1 for path / at Mon Apr 21 22:26:29 CST 2014
................................
/hdfs/test/avg/out/part-r-00000: Under replicated blk_958972218415296316_1141. Target Replicas is 3 but found 1 replica(s).
.
/hdfs/test/hdfsoper/2.f: Under replicated blk_1024136243155007162_1126. Target Replicas is 3 but found 1 replica(s).
$ hadoop fsck / -delete
$ hadoop dfsadmin -report
Configured Capacity: 155277496320 (144.61 GB)
Present Capacity: 138432897024 (128.93 GB)
DFS Remaining: 138429386752 (128.92 GB)
DFS Used: 3510272 (3.35 MB)
DFS Used%: 0%
Under replicated blocks: 14
Blocks with corrupt replicas: 0
Missing blocks: 0
-------------------------------------------------
Datanodes available: 1 (1 total, 0 dead)
Name: 127.0.0.1:50010
Decommission Status : Normal
Configured Capacity: 155277496320 (144.61 GB)
DFS Used: 3510272 (3.35 MB)
Non DFS Used: 16844599296 (15.69 GB)
DFS Remaining: 138429386752(128.92 GB)
DFS Used%: 0%
DFS Remaining%: 89.15%
Last contact: Mon Apr 21 22:33:15 CST 2014
hadoop dfsadmin -safemode [get|enter|leave]
hadoop distcp hdfs://a:9000/a hdfs://b:9000/b
$ start-balancer.sh
starting balancer, logging to /home/nange/programs/hadoopWS/hadoop-1.2.1/libexec/../logs/hadoop-nange-balancer-ubuntu.out
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