We are in the (very) early stages of considering testing backing Hadoop via Ceph - as opposed to HDFS. I've seen a few very vague references to doing that, but haven't found any concrete info (architecture, configuration recommendations, gotchas, lessons learned, etc...). I did find the ceph.com/docs/ info [1] which discusses use of CephFS for backing Hadoop - but this would be foolish for production clusters given that CephFS isn't yet considered production quality/grade.
Does anyone in the ceph-users community have experience with this that they'd be willing to share? Preferably ... via use of Ceph - not via CephFS...but I am interested in any CephFS related experiences too. If we were to do this, and Ceph proved out as a backing store to Hadoop - there is the potential to be creating a fairly large multi-Petabyte (100s ??) class backing store for Ceph. We do a very large amount of analytics on a lot of data sets for security trending correlations, etc... Our current Ceph experience is limited to a few small (90 x 4TB OSD size) clusters - which we are working towards putting in production for Glance/Cinder backing and for Block storage for various large storage need platforms (eg software and package repo/mirrors, etc...). Thanks in advance for any input, thoughts, or pointers ... ~~shane [1] http://ceph.com/docs/master/cephfs/hadoop/
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