restart memcached server after upgrade needed

[Netmees]

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Problem

maibe its posible to add lines to restart memcached or clear cache after upgrade becouse it displays an error if memcached or other cache its used
if its not posible just add a display note about the need of restarting cache system

[solracsf]

Why do you believe this is needed? Please detail.

[Netmees]

just to dont make people loosing time after uptrade trying to figure out why the system dont work and send you a message of "Downgrading is not supported and is likely to cause unpredictable issues" and spend half an precious hour to find out is as simple as restart the memcached server to clear the cache

[solracsf]

Prefix of cached entries should change at version upgrades.
If this is not the case, please fill a complete bug report with error messages, if any.

By the way, Nextcloud can't simply restart your server, but only flush it if this was needed.

[kesselb]

Downgrading is not supported and is likely to cause unpredictable issues

This could also be an issue with opcache (because an old copy of version.php/configuration file is stored somewhere).

[joshtrichards]

Yeah, this sounds like a non-standard PHP OPCache configuration to me.

We document this fairly explicitly, including it's impact on upgrading and configuration changes. See Server tuning - PHP OPCache - Revalidation. Particularly the Warning and Danger boxes.

I suppose we could add hint sort of like:

Downgrading is not supported and is likely to cause unpredictable issues [...]. If this is unexpected, try restarting your PHP environment to clear your cache or whatever

...at least to that particular exception.

[nextcloud-command]

This issue has been automatically marked as stale because it has not had recent activity and seems to be missing some essential information. It will be closed if no further activity occurs. Thank you for your contributions.