[PATCH] ctdb-ipalloc: Split IP allocation into its own build subsystem

[Martin Schwenke]

On Fri, 11 Dec 2015 02:49:37 +1100, Amitay Isaacs <amitay at gmail.com>
wrote:

> On Thu, Dec 10, 2015 at 8:58 PM, Martin Schwenke <martin at meltin.net> wrote:
> 
> > Please review and push...

> We still have functions that use ipalloc_state other than the top-level
> allocation routine ipalloc().  May be it's worthwhile adding a comment on
> the steps involved in the ctdb_takeover_run().

Yeah, you'd mentioned that previously... sorry, I forgot!  :-(

How about the attached patch on top of the split?  I notice that it
really exposes some of the current ugliness...

If we can get the IP configuration and state into a database, as we've
discussed, then a lot of that ugliness can disappear.  Some of the
ugliness comes from needing fake some of the setup in the unit test
code, where we can't use the controls to fetch information from nodes.
If we're clever then we can change the unit test code to load the
configuration and state directly from the database, skip the
controls, and just fake the updates to the database state.  I'll be a
thing of beauty.

My latest thoughts on that are to have <ip-address>@<pnn> as the key
and current VNN-like information in the value.  We can then add more
information to the value to improve and clean up the algorithm(s).
Anyway, it's one of the things I'm pondering in the background...

> Also, separting of the ip allocation routines now makes some of the
> previously static functions non-static (e.g. node_ip_coverage).  It might
> be better to rename all those functions with "ipalloc_" prefix even though
> those functions are only used in recovery daemon.  Those could be extra
> patches on top of the split-up work.

Yes, definitely.  For the split I didn't want to make any code changes.
I just want to move things around.  However, I will admit that it isn't
yet in my queue...  :-)

peace & happiness,
martin
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