[UPGRADE] Upgrade component to the latest version: Zookeeper

[rafzei]

Is your feature request related to a problem? Please describe.

• End of support for 3.4.12 version (06.2020).
• CVE-2019-0201

Describe the solution you'd like

• upgrade to latest version if possible
• backport to supported Epiphany versions

Additional context
If possible, do an improvements in Zookeeper role. 👍

[rafzei]

Please verify if:

• latest Kafka version contains embedded Zookeeper
• we need a standalone Zookeeper (ask other teams)

[plirglo]

Please see task #1137 - Kafka Upgrade.
We need upgrade Zookeeper to version supported by Kafka latest version:
Kafka 2.6.0 -> Zookeeper 3.5.8

After Kafka 3.0 release Zookeeper probably will not be needed for Kafka.

[mkyc]

Lets upgrade to 3.5.8.

[toszo]

Lets upgrade to 3.5.8.

@mkyc why 3.5.8 and not 3.6.2 - the latest one?

[mkyc]

Hmmmm ... there was some reason @plirglo gave that version in discussion, but I do not remember that reason.

[rpudlowski93]

Upgraded to 3.5.8 done in PR #1897

[rpudlowski93]

@plirglo Can You comment why to version 3.5.8 not to latest one? I think that the information in kafka release was leading the decision : link Zookeeper in latest version 3.6.2 could be nice . @plirglo Do You have any significant knowledge about it? If not I can make upgrade to latest version in mentioned PR #1897

[rafzei]

After the discussion about the target version, can we backport this change to previous Epi versions?

[plirglo]

@rpudlowski93 I just based on Kafka documentation link, where stands that Kafka 2.6.0 goes with Zookeeper 3.5.8. Maybe Zookeeper 3.6.2 also will be compatible, but 'm not sure and we need additional test if we want to use this version.

[rpudlowski93]

In my opinion, we can stay with 3.5.8 how the documentation say, PR for the upgrade was already merged.
If we would love to have the latest version it could be a easy/fast change but we would need some additional tests for it.

@rafzei Yes, we can backport it to previous version of epiphany but only when upgrade Kafka is backported. It should go together. Kafka 2.6.0 must work with Zookeeper in at least 3.5.8 version.

[rafzei]

@rpudlowski93 I will create issues to backport Kafka.

[przemyslavic]

Checked:
✅ epicli apply
✅ epicli upgrade