Recent (probably MacOS) mail app provoking endless cyrus.index writes on 2.3 server.

[ktm at rice.edu]

On Fri, Oct 23, 2015 at 10:59:08PM +0200, Eric Luyten wrote:
> On Tue, October 13, 2015 3:26 pm, ktm at rice.edu wrote:
> 
> > The El Capitan Mac Mail was recently released. It definitely has a problem.
> > We saw our typical sync log size go from 10k when busy to 100k+. We are going
> > to recommend that people wait to upgrade to that release until the problem is
> > addressed.
> >
> > Regards,
> > Ken
> 
> 
> Earlier today I used DTrace to capture I/O operations on our Solaris 10 mail
> server.
> The imapd processes hammered by those El Capitan Mail.app clients perform
> roughly 500 (five hundred) cyrus.index + cyrus.cache rewrites per second.
> Multiply by the number of affected users, now numbering beyond one hundred.
> Cool.
> 
> 
> Eric.
> 

Hi Eric,

A bug in cyrus-imapd version 2.3.x. I am looking into generating an rpm
with a patch. In the meantime, we are disabling the automatic folder compaction
option to keep from hammering the server.

Regards,
Ken