[PATCH] Remove simple KCC code

Stefan Metzmacher metze at samba.org
Thu Feb 2 11:38:09 UTC 2017


I've filed to bugs:

But there're more things where I don't have enough
information for a detailed bug report.

I noticed very strange results with the new kcc
with customers upgrading from earlier versions to 4.5.

With 24 sites (one dc per site) a new dc only replicates
with 2 others (and no longer with the one used for the join).
while all others seem to replicate with a lot more (far more then
10, but maybe also all 23 others).

I such situations it's sometimes required to say
just replicate with everyone and at least avoid
long split brain times, instead of trying to debug
samba_kcc for a few hours.


Am 13.01.2017 um 09:24 schrieb Andrew Bartlett:
> On Fri, 2017-01-13 at 09:12 +0100, Stefan Metzmacher wrote:
>> Am 13.01.2017 um 09:07 schrieb Andreas Schneider:
>>> On Friday, 13 January 2017 13:00:36 CET Bob Campbell wrote:
>>>> Hi,
>>>> We don't think that the simple full-mesh replication KCC is
>>>> useful any
>>>> more, and it's been a while since the new one was introduced. So,
>>>> here
>>>> is a patch to remove it.
>>>> Please discuss/review.
>>>> Thanks,
>>>> Bob
>>> I've pushed it and added your missing sign-off.
>> I'd like to discuss that further.
>> There're still some environments that
>> use the old kcc even with 4.5.
> I'm curious, what fails with the new KCC for them?  Just the need to
> switch the DCs to it manually if they are not on 4.5 yet, or something
> more?  For our larger customers (with larger numbers of DCs or
> hub/spoke satellite links), things only got stable/practical once they
> moved to the new KCC.
> I'd like to see this untested extra code (or at the very least the
> parts that run but don't actually modify the repsFrom) gone for 4.7 but
> there isn't an immediate rush. 
> Thanks,
> Andrew Bartlett

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