Re: [GIT PULL] Ceph distributed file system client for 2.6.33

From: Sage Weil
Date: Mon Dec 21 2009 - 11:42:59 EST


On Sat, 19 Dec 2009, Valdis.Kletnieks@xxxxxx wrote:

> On Fri, 18 Dec 2009 12:54:02 PST, Sage Weil said:
> > I would still like to see ceph merged for 2.6.33. It's certainly not
> > production ready, but it would be greatly beneficial to be in mainline for
> > the same reasons other file systems like btrfs and exofs were merged
> > early.
>
> Is the on-the-wire protocol believed to be correct, complete, and stable? How
> about any userspace APIs and on-disk formats? In other words..
>
> > > The git tree includes the full patchset posted in October and incremental
> > > changes since then. I've tried to cram in all the anticipated protocol
> > > changes, but the file system is still strictly EXPERIMENTAL and is marked
>
> Anything left dangling on the changes?

The wire protocol is close. There is a corner cases with MDS failure
recovery that need attention, but it can be resolved in a backward
compatible way. I think a compat/incompat flags mechanism during the
initial handshake might be appropriate to make changes easier going
forward. I don't anticipate any other changes there.

There are some as-yet unresolved interface and performance issues with the
way the storage nodes interact with btrfs that have on disk format
implications. I hope to resolve those shortly. Those of course do not
impact the client code.

sage

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