Re: Mapping data and metadata between rados and cephfs

[Gregory Farnum <gfarnum@xxxxxxxxxx>]

Yeah, CephFS and RGW can't cross-communicate at all. Out of the original choices, "this will never happen".

Somebody who was very, very dedicated could set something up. But it would basically be the same as running s3fs in the Ceph servers instead of on the clients (or probably the other way around — making rgw mount cephfs), but it would be a huge amount of effort for a pretty small gain since you can get mostly the same effect by running one of the fs-backed S3 clones on top of CephFS.

-Greg

On Wed, Jun 28, 2017 at 12:51 PM David Turner <drakonstein@xxxxxxxxx> wrote:

CephFS and RGW store data differently.  I have never heard of, nor do I believe that it's possible, to have CephFS and RGW sharing the same data pool.

On Wed, Jun 28, 2017 at 2:48 PM Lefman, Jonathan <jonathan.lefman@xxxxxxxxx> wrote:

Yes, sorry. I meant the RadosGW. I still do not know what the mechanism is to enable the mapping between data inserted by the rados component and the cephfs component. I hope that makes sense.

 

-Jon

 

From: David Turner [mailto:drakonstein@xxxxxxxxx]
Sent: Wednesday, June 28, 2017 2:46 PM
To: Lefman, Jonathan <jonathan.lefman@xxxxxxxxx>; ceph-users@xxxxxxxxxxxxxx
Subject: Re: Mapping data and metadata between rados and cephfs

 

You want to access the same data via a rados API and via cephfs?  Are you thinking RadosGW?

 

On Wed, Jun 28, 2017 at 1:54 PM Lefman, Jonathan <jonathan.lefman@xxxxxxxxx> wrote:

Hi all,

 

I would like to create a 1-to-1 mapping between rados and cephfs. Here's the usage scenario:

 

1. Upload file via rest api through rados compatible APIs

2. Run "local" operations on the file delivered via rados on the linked cephfs mount

3. Retrieve/download file via rados API on newly created data available on the cephfs mount

 

I would like to know whether this is possible out-of-the-box; this will never work; or this may work with a bit of effort. If this is possible, can this be achieved in a scalable manner to accommodate multiple (10s to 100s) users on the same system?

 

I asked this question in #ceph and #ceph-devel. So far, there have not been replies with a way to accomplish this. Thank you.

 

-Jon

 

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