zlib errors after upgrading

[Robert Nowotny]

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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