Memcached cache module for Znuny

[pboguslawski]

Proposed change

This mod allows one to implement enterprise, multiserver Znuny installations with shared cache moved from slow NFS-like solutions to faster Memcached server.

Requires Cache::Memcached::Fast installed (libcache-memcached-fast-perl package in Debian).

Cache benchmarking possible with otrs.Console.pl Dev::Tools::CacheBenchmark.

Note: memcached service (i.e. memcached -m 256 -I 16m from official image) must be listening at address configured with Cache::Module::Memcached###Servers for cache unit tests to pass. This CI adjustment is not a part of this PR.

Type of change

• '1 - 🚀 feature' - New feature (which adds functionality to an existing integration)

Additional information

Author-Change-Id: IB#1046574

Checklist

• [x] The code change is tested and works locally.(❗)
• [x] There is no commented out code in this PR.(❕)
• [ ] You improved or added new unit tests.(❕)
• [x] Local ZnunyCodePolicy passed.(❕)
• [x] Local UnitTests / Selenium passed.(❕)
• [ ] GitHub workflow CI (UnitTests / Selenium) passed.(❗)

[joserribeiro26]

@rkaldung @dennykorsukewitz Is this feature on the roadmap for the next versions? It's very interesting for scalability, we use it here when we set up a good environment with multiple front-ends.

[rkaldung]

@rkaldung @dennykorsukewitz Is this feature on the roadmap for the next versions? It's very interesting for scalability, we use it here when we set up a good environment with multiple front-ends.

@joserribeiro26 Either this PR here or https://github.com/znuny/Znuny/pull/112 would be great. But both PRs have any unit tests and this is no-go.

[pboguslawski]

But both PRs have any unit tests and this is no-go.

Redis is not Memcached and Memcached is not Redis so both PR's should be considered as separate features. Standard unit test checks all availabe cache backends so no need for separate unit tests for this PR.

[rkaldung]

But both PRs have any unit tests and this is no-go.

Redis is not Memcached and Memcached is not Redis so both PR's should be considered as separate features. Standard unit test checks all availabe cache backends so no need for separate unit tests for this PR.

👍 Who said they are identical? If all backends are covered by the default unit test that's fine, never checked this. @dennykorsukewitz Can you confirm that existing unit tests cover also this PR?