Hi, On 05/28/2013 10:03 AM, Alvaro Izquierdo Jimeno wrote:
Hi! I’m using rados Gateway with the Swift API to handle objects into Ceph. I’m very interesting to handle metadata with the objects too. So, I can add metadata headers with a given format (X-Container-Meta-X : Y) and get it back again without problem. But, after this, I have several doubts about it: 1.- Which pool stores the metadata? By default, the objects are stored in .rgw.buckets pool. After a updating metadata request (POST request), I can see with ‘rados df’ that the only one pool updated is .rgw.buckets. So, Is the metadata and the objects stored in the same pool?
Yes, it's stored as RADOS attributes. See this example: root@monitor:~# rados -p .rgw.buckets listxattr 8421179.1_auroracloud.png user.rgw.acl user.rgw.content_type user.rgw.etag user.rgw.x-amz-acl user.rgw.x-amz-date root@monitor:~#
2.- Can I setup this? I mean If I can store the metadata in a different pool or in a Database?
No, that is not possible. It's stored as RADOS xattrs.
3.- By the way, is possible to search into radosgw by a metadata? For instance, searching how many objects have the metadata X-Container-Meta-X equal to Y. If the first question in this points is yes, can I make this kind of searching from the Swift API?
No, RADOS doesn't support search queries like that. You can't say: "Hey, give me all objects with xattr Y = Z"
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Thanks you so much and best regards, Álvaro. ____________ Verificada la ausencia de virus por G Data AntiVirus Versión: AVA 22.9938 del 28.05.2013 Noticias de virus: www.antiviruslab.com <http://www.antiviruslab.com> _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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