zlib errors after upgrading

[Robert Nowotny]

got it - I see a lot of commits zstd related, after the release 2.3.11.3 
- is it considered as stable ?



Am 28.08.2020 um 16:49 schrieb Timo Sirainen:
> zstd support was added in v2.3.11 (not v2.3.12 like I mistakenly tried 
> to say in the earlier mail).
>
>> On 28. Aug 2020, at 16.36, Robert Nowotny <rnowotny at rotek.at 
>> <mailto:rnowotny at rotek.at>> wrote:
>>
>>
>> ok, I did install zstd (zstd command line interface 64-bits v1.4.4, 
>> by Yann Collet)
>>
>> reconfigured & compiled dovecot 2.3.10.1 again with option : with-zstd
>>
>> changed the configuration file to :
>>
>> zlib_save = zstd
>>
>> and restarted dovecot -
>>
>> now I have following log file errors :
>>
>> Aug 28 16:17:39 lxc-imap dovecot: 
>> imap(rnowotny)<237930><H1kft/CtENRUclcc>: Error: zlib_save: Unknown 
>> handler: zstd
>> Aug 28 16:17:44 lxc-imap dovecot: 
>> imap(rprager)<237939><p5hst/Ct8evAqKhu>: Error: zlib_save: Unknown 
>> handler: zstd
>> Aug 28 16:17:44 lxc-imap dovecot: 
>> imap(rprager)<237940><Vp5st/Ct8uvAqKhu>: Error: zlib_save: Unknown 
>> handler: zstd
>> Aug 28 16:17:44 lxc-imap dovecot: 
>> imap(rprager)<237941><U31tt/Ct8+vAqKhu>: Error: zlib_save: Unknown 
>> handler: zstd
>> ...
>>
>>
>> what I do wrong here ?
>>
>>
>>
>>
>> Am 28.08.2020 um 13:15 schrieb Timo Sirainen:
>>> On 28. Aug 2020, at 12.10, Robert Nowotny <rnowotny at rotek.at 
>>> <mailto:rnowotny at rotek.at>> wrote:
>>>>
>>>> unfortunately after re-installing 2.3.11.3, those broken-pipe 
>>>> errors appear again. (on different, new files)
>>>> so for sure there is something broken with zlib.
>>>> I will go back to2.3.10.1 now.
>>>> attached is the configuration file, though it did not change 
>>>> between 2.3.10.1 and 2.3.11.3
>>>
>>> Oh, this is with xz, not with gz like we first thought. There are 
>>> some known problems with xz, which is why we are planning on 
>>> removing it entirely. I'm not sure why v2.3.11 breaks it, although 
>>> there are some changes related to it but it might be coincidence. I 
>>> can't reproduce this problem though.
>>>
>>> In any case, I'd recommend switching to zlib or to zstd in v2.3.12. 
>>> (In theory you could leave the existing mails xz-compressed, but 
>>> best would be to re-compress everything via dsync so old mails can 
>>> be read when we eventually remove xz support.)
>>>
>>
>

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