Bug#342660: [Pkg-Cyrus-imapd-Debian-devel] Bug#342660: cyrus22-imapd: suggest making skiplist the default database backend for new installs

[Etienne Goyer]

I would second that.  BDB backend have been an endless source of
problems to me, and all my production installation are now skiplist.


Mark Nipper wrote:
> Package: cyrus22-imapd
> Version: 2.2.12-1
> Severity: wishlist
> Tags: patch
> 
>         After recent problems upgrading from the 2.2.12 packages
> previously available from debian.speedblue.org which were using db3 to
> the new official packages using db4.2, I would suggest making the
> default backend for everything on a new installation skiplist over
> anything BDB.  There are seemingly known issues even using db4.3 and
> although I upgraded all of my existing db3 files to db4.2 using
> db4.2_upgrade, I still ended up having cyrmaster crash on me due to
> critical database errors.
> 
>         This seems like a headache which most folks could easily avoid
> by using the (only tad bit slower for most installations) skiplist
> format which probably won't be changing much if at all between releases.
> I'm not saying BDB support should be removed as it will provide the
> fastest possible configuration for folks willing to deal with the
> potential hassles.  Anyway, just adding something like:
> ---
> # bypass BDB hell
> annotation_db: skiplist
> duplicate_db: skiplist
> mboxlist_db: skiplist
> ptscache_db: skiplist
> quota_db: skiplist
> seenstate_db: skiplist
> subscription_db: skiplist
> tlscache_db: skiplist
> ---
> 
> to imapd.conf will cover things for new installations.
> 
>         At the very least, I would mention this as either part of a
> debconf message or in one of the Debian README files so that folks are
> aware of the potential dangers in using the BDB backend and a really
> simple way to avoid trouble by using only skiplist instead.
> 
>         I was thankfully able to convert the necessary db4.2 files I had
> over to skiplist.  After removing /var/lib/cyrus/db(.backup[12])?/* and
> the skiplist conversion for everything else (.db, .seen and .sub files),
> Cyrus is stable again and I have yet to see any further problems.
> 
> -- System Information:
> Debian Release: testing/unstable
>   APT prefers testing
>   APT policy: (700, 'testing'), (600, 'unstable'), (500, 'stable'), (1, 'experimental')
> Architecture: i386 (i686)
> Shell:  /bin/sh linked to /bin/bash
> Kernel: Linux 2.6.13.4
> Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
> 
> Versions of packages cyrus22-imapd depends on:
> ii  cyrus22-common                2.2.12-1   Cyrus mail system (common files)
> ii  libc6                         2.3.5-8    GNU C Library: Shared libraries an
> ii  libdb4.2                      4.2.52-18  Berkeley v4.2 Database Libraries [
> ii  libsasl2                      2.1.19-1.7 Authentication abstraction library
> ii  libssl0.9.8                   0.9.8a-3   SSL shared libraries
> ii  libwrap0                      7.6.dbs-8  Wietse Venema's TCP wrappers libra
> 
> cyrus22-imapd recommends no packages.
> 
> -- no debconf information
> 
> 
> 
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