The blocks of a file and the blocks of the snapshot are the same.
(i.e. There is no data copying when creating snapshots)
Therefore the blocks are not removed from datanode disks if a file is
removed.
Thanks,
Akira
(2014/08/20 15:22), juil cho wrote:
hadoop version 2.4.1.
I have tested the snapshot.
1. upload file, /tmp/test.avi
2. create snapshot, /tmp snap1
3. delete file, /tmp/test.avi
4. moved to the Trash, /user/hadoop/.Trash/tmp/test.avi
5. file deleted in trash.
6. *but, blocks is not deleted in datanode disk. why??*
7. delete snapshot(snap1)
8. blocks is deleted in datanode disk. why???
I do not understand. Why not remove the block on the disk if the snapshot?
