CONDSTORE by default?

Michael Menge michael.menge at
Mon May 4 08:20:53 EDT 2009


doc/readme.html in 2.3.14 still says:

Upgrade Caveats

     This section reserved for WARNING WARNING WARNING comments.
     Note that the replication protocol currently does not have the facility
     to support the IMAP CONDSTORE extension (modification sequences). It is
     recommended that you do not try to use both CONDSTORE and replication
     at this time. The deficiencies in the replication protocol will be
     fixed in version 2.3.9.

Is this problem fixed or is it still valid?

Quoting Ken Murchison <murch at>:

> There is a higher bookkeeping cost when only \Seen state changes  
> because rather than just updating seen.db, we also have to tweak  
> cyrus.index. The cost may not be enough to worry about, but since  
> \Seen state is most likely the most frequently used flag (and most  
> likely is changed separately from other flags), I didn't want to  
> force CONDSTORE on people until we had a good handle on the  
> performance hit.
> Bron Gondwana wrote:
>> Hi Ken, everyone,
>> Can anyone think of a good reason why CONDSTORE isn't enabled
>> by default for everyone all the time?  Back when it wasn't
>> stable, fair enough - but I think it's pretty close now, and
>> am willing to put a bit more effort in to finishing the job...
>> Thunderbird 3 will support CONDSTORE to reduce the FLAGS traffic
>> quite considerably, and hopefully other clients will follow suit
>> if there is enough server support to be worth the effort.
>> Looking at the code, the "bookkeeping" cost is quite low, and
>> it always touches records that are being updated anyway, so the
>> writes will be combined in the same block most of the time.
>> Besides, it will simplify the code considerably to remove all
>> the tests for "CONDSTORE ENABLED" everywhere.
>> Bron ( looking at turning it on for all new mailboxes soon,
>>       and then enabling it for all the old ones )
> -- 
> Kenneth Murchison
> Systems Programmer
> Carnegie Mellon University

M.Menge                                Tel.: (49) 7071/29-70316
Universität Tübingen                   Fax.: (49) 7071/29-5912
Zentrum für Datenverarbeitung          mail:  
michael.menge at
Wächterstraße 76
72074 Tübingen
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