+1 on undelete. Move the deleted files into a special place and start
actually deleting them when the disk space is low. If the space gets
low only on few nodes, and the load is not high, the blocks from
deleted files may be re-replicated to other nodes, -- or the
replication factor of deleted files may be decreased.
Snapshot seems an orthogonal functionality with a whole bunch of
independent requruirements
On Aug 8, 2006, at 10:18 AM, Yoram Arnon (JIRA) wrote:
support undelete, snapshots, or other mechanism to recover lost files
---------------------------------------------------------------------
Key: HADOOP-432
URL: http://issues.apache.org/jira/browse/HADOOP-432
Project: Hadoop
Issue Type: Improvement
Reporter: Yoram Arnon
currently, once you delete a file it's gone forever.
most file systems allow some form of recovery of deleted files.
a simple solution would be an 'undelete' command.
a more comprehensive solution would include snapshots, manual and
automatic, with scheduling options.
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