index problems after update

[Adi Pircalabu]

On 2019-02-21 22:18, Sami Ketola via dovecot wrote:
>> On 21 Feb 2019, at 12.23, Hajo Locke via dovecot <dovecot at dovecot.org> 
>> wrote:
>> I think mbox+procmail is a classic setup and wide used and good 
>> solution for many usecases. Same setup we use many years.
>> We run ~2 mio mailboxes. our automated systems depends on this setup. 
>> creating mailboxes, managing mailboxes, creating automated 
>> filterrules, backupsystem to tell something of them. we can not switch 
>> our whole mailsetup to work around this bug.
>> How to get a dump if dovecot not crashing but has wrong behaviour? I 
>> would like to help and provide useful info, but it depends on kind of 
>> problem.
>> I think if a classic setup is not working in dovecot any more, this is 
>> a serious problem.
> 
> In you first email to this thread it says:
> 
>> Feb  8 08:45:37 hostname dovecot[14882]: imap(myuser): Fatal: master: 
>> service(imap): child 14135 killed with signal 6 (core dumped)
> 
> So imap is crashing and even dumping a core.
> 
> Also I must disagree with your mbox+procmail statement. mbox has
> always been very unoptimised mailbox format and everyone should be
> emphasised not to use it.
> Also that combination has always had problems with indexing and file
> locking. I would not use it on high volume mailservers. Or even medium
> volume mailservers.

Not directly affected by this issue since I'm not using mbox for any 
production system nor have I for many years. And it'd take a lot of 
effort to convince me to use mbox for anything someone would even dare 
to classify, even remotely, as "production". But if I understand OP's 
point of view correctly, he's not arguing necessarily for or against a 
specific mailbox format. Instead, he's flagging a regression and people 
will be very reluctant to upgrade or even adopt a certain feature in a 
new release of a product if regressions are seen as acceptable. 
Something that previously worked in an otherwise unchanged environment 
stopped working after an upgrade and this is a regression. Trying to 
convince people to move away from mbox is a very sensible approach, I'm 
all for it, but in cases like this not practical.

-- 
Adi Pircalabu