Might be totally wrong here, but it’s not layering them but replacing hdfs:// URLs with ceph:// URLs so all the mapreduce/spark/hbase/whatever is on top can use CephFS directly which is not a bad thing to do (if it works) :-)
> On 02 Feb 2016, at 16:50, John Spray <jsp...@redhat.com> wrote: > > On Tue, Feb 2, 2016 at 3:42 PM, Jose M <soloning...@hotmail.com > <mailto:soloning...@hotmail.com>> wrote: >> Hi, >> >> >> One simple question, in the ceph docs says that to use Ceph as an HDFS >> replacement, I can use the CephFs Hadoop plugin >> (http://docs.ceph.com/docs/master/cephfs/hadoop/). >> >> >> What I would like to know if instead of using the plugin, I can mount ceph >> in fstab and then point hdfs dirs (namenode, datanode, etc) to this mounted >> "ceph" dirs, instead of native local dirs. >> >> I understand that maybe will involve more configuration steps (configuring >> fstab in each node), but will this work? Is there any problem with this type >> of configuration? > > Without being a big HDFS expert, it seems like you would be > essentially putting one distributed filesystem on top of another > distributed filesystem. I don't know if you're going to find anything > that breaks as such, but it's probably not a good idea. > > John > >> >> Thanks in advance, >> >> >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com <mailto:ceph-users@lists.ceph.com> >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> <http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com> >> > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com <mailto:ceph-users@lists.ceph.com> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > <http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com>
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