Upgrade Mongodb from 3.6 to 4.2 for Unifi Controller

[dewhite]

Hello all,

It seems I've made a little mess. I run Unifi Controller on two Gentoo systems (home and small business). I recently upgraded both setups to version 6.1.21, which pulled in an update of Mongodb from 3.6.X to 4.2.8. After the updates, I later noticed that Unifi Controller isn't starting, and I troubleshot that to an error in /var/log/unifi/mongodb.log that reads, in part:

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2020-11-23T15:32:52.803-0600 F  CONTROL  [initandlisten] ** IMPORTANT: UPGRADE PROBLEM: Found an invalid featureCompatibilityVersion document (ERROR: BadValue: Invalid value for version, found 3.6, expected '4.2' or '4.0'. Contents of featureCompatibilityVersion document in admin.system.version: { _id: "featureCompatibilityVersion", version: "3.6" }. See https://docs.mongodb.com/manual/release-notes/4.2-compatibility/#feature-compatibility.). If the current featureCompatibilityVersion is below 4.0, see the documentation on upgrading at https://docs.mongodb.com/manual/release-notes/4.2/#upgrade-procedures.

Easy, right? Just read the docs and upgrade the db file. Small wrinkle - Mongodb seems to require that 3.6 be upgraded to 4.0, then 4.0 to 4.2. OK, no problem.

Wait. All 3.6.X and 4.0.X packages have been masked, because:

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Mask dev-db/mongodb versions which do not support python3 so we can move forward in cleaning python2 from tree. Bug #708954. We keep the ebuilds available since some of those versions are still supported by upstream. See: https://jira.mongodb.org/browse/SERVER-52687
Affected packages
<dev-db/mongodb-4.2.8
Author/Date
Alexys Jacob <ultrabug@gentoo.org> (2020-11-09 00:00:00 +0000 UTC)

Before I started monkeying around under the hood to try to bypass the masks and "downgrade" to a 4.0.X package temporarily, I thought I'd ask for any practical advice the community is willing/able to offer.

Bonus Points: I've already completed the update to Profile 17.1 on one of these systems (of course, on the system with the more elaborate and critical Unifi setup). The other is still on Profile 17.0. Not sure if that matters, but it seemed at least tangentially related...

As always - any thoughts, suggestions, questions, references, rants, etc. will be greatly appreciated.

Thanks,

Dan

[Hu]

Moved from Other Things Gentoo to Duplicate Threads because the OP cross-posted the request to P&P as Temporarily downgrade Mongodb to masked 4.0.X.