Re: [Geowebcache-devel] Clustering GWC against a relational database

[Andrea A. <and...@ge...>]

On Sun, Apr 29, 2012 at 10:00 AM, Andrea Aime
<and...@ge...>wrote:

> All right, updated my GWC checkout and going to check the changes in the
> quota store mechanism (my checkout was indeed old), and will have a second
> look at metastore, but I think I'm getting close to forming an idea of how
> much
> time it would take to remove the metastore and build a jdbc version of
> the quota store. Thanks!
>

Mumble, a few other questions came to mind, this time more admin/process
oriented.

First off, where would the development occur? I guess in some branch of a
clone
of the official GWC git, right?

Then, say the features are ready, and a push is prepared. Where would that
land?
Regardless of a review the work would not be battle tested, so it should
probably
stay away of a "stable" series. Does GWC has a concept of stable series
though?
How is the difference between bug fixes and "potentially unstable new
features"
managed?

Another thing that I was thinking about is what to do with people upgrading
if the metastore is gone.
Would they have to wipe out and redo the tile cache?
Is it something that we could figure out automatically?

Also, removing a concept/interface is always somewhat a hard sell, what
if somebody implemented metastore in some other way?

Finally, say we put everything on the file system (using sha-1 hashing,
controlling the tile times and so on)... what happens if someone created
a custom blob store that is not file system based?

Hmm... and also, the ideas about controlling the date of a tile either
in the tile timestamp itself or even in a sidecar file would not be
applicable
unless also BlobStore is modified. Hmm.. I guess an alternative could
be that the same object implements both BlobStore and Metastore
and follows the rules we depicted above to keep everything on
the same filesystem.

Cheers
Andrea

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Ing. Andrea Aime
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Tech lead

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