Bug#342660: cyrus22-imapd: suggest making skiplist the default database backend for new installs
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-common2.2.12-1 Cyrus mail system (common files) ii libc6 2.3.5-8GNU 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 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Bug#342660: cyrus22-imapd: suggest making skiplist the default database backend for new installs
On Fri, 09 Dec 2005, Mark Nipper wrote: anything BDB. There are seemingly known issues even using db4.3 and db4.3 != db4.2... and there is *NO* *CHANCE* of we linking to BDB 4.3 anytime soon, if I can help it. Skiplist is sensitive to corruption. As in: if it happens, you can start crying. It *can* and *does* deal well with aborted transactions, that's not what I am talking about. bdb 4.2 is fairly resilient to corruption, most of the time a db4.2_recover will do just that, with no data loss. It is also faster than skiplist for random lookups (mailboxes DB/TLS DB/duplicate delivery suppression DB), *especially* when you have a huge ammount of processes doing it (which happens to the mailbox db). So, I really think we should keep using BDB 4.2 as a default for those functions where upstream recommends doing so for performance reasons. 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. Cyrus needs to be stopped for that to work without causing corruption, AFAIK. I didn't attempt a db migration yet using Cyrus, but it is always posible to do so using dumps. 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. No debconf obnoxious messages. This is non-negotiable. But discussing about the good and bad of each database backend in the documentation is a good idea. -- One disk to rule them all, One disk to find them. One disk to bring them all and in the darkness grind them. In the Land of Redmond where the shadows lie. -- The Silicon Valley Tarot Henrique Holschuh -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Bug#342660: [Pkg-Cyrus-imapd-Debian-devel] Bug#342660: cyrus22-imapd: suggest making skiplist the default database backend for new installs
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-common2.2.12-1 Cyrus mail system (common files) ii libc6 2.3.5-8GNU 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 ___ Pkg-Cyrus-imapd-Debian-devel mailing list [EMAIL PROTECTED] http://lists.alioth.debian.org/mailman/listinfo/pkg-cyrus-imapd-debian-devel -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
