W.P is correct, however, that standard techniques like snapshots and mirrors
and point in time backups do not exist in standard hadoop.
This requires a variety of creative work-arounds if you use stock hadoop.
It is not uncommon for people to have memories of either removing everything
or somebody close to them doing the same thing.
Few people have memories of doing it twice.
On Wed, Mar 16, 2011 at 11:20 AM, David Rosenstrauch <[EMAIL PROTECTED]>wrote:
> On 03/16/2011 01:35 PM, W.P. McNeill wrote:
>> On HDFS, anyone can run hadoop fs -rmr /* and delete everything.
> Not sure how you have your installation set but on ours (we installed
> Cloudera CDH), only user "hadoop" has full read/write access to HDFS. Since
> we rarely either login as user hadoop, or run jobs as that user, this forces
> us to explicitly set and chown directory trees in HDFS that only specific
> users can access, thus enforcing file read/write restrictions.