I'm pretty sure you'll find more support on a cdh specific mailing lists. Apparently, such a conversion won't be covered by Apache Hadoop documentation.
Cos On Fri, Jun 17, 2011 at 04:09PM, J. Ryan Earl wrote: > Hello, > I'm trying to nail down a process for converting existing Apache-hadoop > clusters with significant amounts of pre-existing data to CDH3. While > I've found documentation for upgrading between CDH versions, I haven't > seen one for standard Apache-hadoop => CDH3 with the "new" mapred and hdfs > users and groups. I'm looking for the proper method to manually convert > permissions on existing data from a single user&group setup > (hadoop/hadoop) to the 2user & 3 group setup of hdfs/mapred users with > hdfs/mapred/hadoop groups. > What I'm thinking needs to happen is something like this: > 1. Shutdown cluster. > 2. Perform full configuration and HDFS data backup. > 3. Delete existing hadoop user/group while leaving HDFS data/mapred > folders untouched. > 4. Install CDH3 packages (which sets up new users and groups). > 5. Manually adjust permissions/groups/ownership of old data files to > match new CDH3 security setup. > 6. Flow into standard hadoop-upgrade process. > Basically, I'm trying to nail down setup 5, and would appreciate any > guidance on this. I'm guessing I just haven't found the correct document > since this seems like it would be a common endeavor. > Thanks in advance, > -JR
