[mythtv-users] Recordings not working

John Pilkington johnpilk222 at gmail.com
Tue May 25 20:24:22 UTC 2021

On 25/05/2021 18:57, Bill Meek wrote:
> On 5/25/21 12:30 PM, Gary Buhrmaster wrote:
>> On Tue, May 25, 2021 at 5:01 PM Paul Harrison <mythtv at mythqml.net> wrote:
>>> mythzmserver doesn't use Qt so connects to the ZM DB through the client
>>> library. It does set the reconnect flag but for reliability it still
>>> periodically kicks the DB by sending a dummy "SELECT NULL;" query.
>> As I recall, old (no longer supported?) versions
>> of mysql automatically reconnected, and then
>> it was changed to not auto reconnect to avoid
>> resetting transaction state out from under the
>> applications without notice, and the option was
>> made available to revert to the previous behavior.
>> Belt and suspenders in MythTV was almost
>> certainly the best (only?) choice during those
>> various transitions of mysql versions.
>>> It's very possible that kicking the DB is not
>>> required anymore with newer versions of the
>>> client library but I've not tried it.
>> If the code works, the old adage of not
>> "improving" it often applies.
> Just pushed a fix for master. I'll let it soak for some time
> before back porting to v31.0.
> Users that have the wait_timeout timeout work around should remove it,
> or you can set it to a few minutes to have the disconnect happen more
> often. mythbackend --seterbose general:debug will allow a new log
> message: ...mythdbcon.cpp:947 (lostConnectionCheck) - SQL Native Error Code: n.
> The code will be 4031 for 20.04 users with mysql* 8.0.25 or 2006 if
> that fix isn't in yet.
> It's only slightly improved (in my opinion about the slightly and
> or improved parts).
> Looking at git log -p mythtv/libs/libmythbase/mythdbcon.cpp,
> I believe if reconnecting is successful, the query is retried.
> Several changes to improve this were done log ago.

Perhaps I ought to report that my two boxes running master with MariaDB 
have not had this problem; I guess that using EIT has kept the DBs 

MariaDB versions 10.4.19 Fedora 33, 5.5.68 (!!) el7

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