hdfs文件3个副本BLK的查找

 本文介绍了如何使用hadoop fsck命令来检查HDFS文件的副本分布情况，通过示例展示了如何找到文件的BLK块以及它们在不同DataNode上的存储位置。

开始部署hdfs的时候，文件冗余3份。那么1个文件分拆成那些BLK，分别存储在那里呢？

hadoop fsck <需要找的文件名> -files -blocks -locations 

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[root@master ~]# hadoop fsck --help
DEPRECATED: Use of this script to execute hdfs command is deprecated.
Instead use the hdfs command for it.

Usage: DFSck <path> [-list-corruptfileblocks | [-move | -delete | -openforwrite] [-files [-blocks [-locations | -racks]]]]
        <path>  start checking from this path
        -move   move corrupted files to /lost+found
        -delete delete corrupted files
        -files  print out files being checked
        -openforwrite   print out files opened for write
        -includeSnapshots       include snapshot data if the given path indicates a snapshottable directory or there are snapshottable directories under it
        -list-corruptfileblocks print out list of missing blocks and files they belong to
        -blocks print out block report
        -locations      print out locations for every block
        -racks  print out network topology for data-node locations