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A person who has a cat by the tail knows a whole lot more about cats than someone who has just read about them.
Mark Twain
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Useful commands for Hadoop HDFS troubleshooting

[hadoop@master ~]$ hdfs dfsadmin -report 17/04/13 00:06:51 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform… using builtin-java classes where applicable Configured Capacity: 37576769536 (35.00 GB) Present Capacity: 33829806080 (31.51 GB) DFS Remaining: 33829789696 (31.51 GB) DFS Used: 16384 (16 KB) DFS Used%: 0.00% Under replicated blocks: 0 Blocks with corrupt replicas: 0 Missing […]