I am trying to upgrade from version 4.1.2 to 5.1.4 of Jira on a Linux server using MySQL for the DB. Can't do this is a single step, so the question is what version should I use for the intermediate step?
I've done 4.0 to 5.1 safely - run into two issues - some user group memberships are dropped, and Greenhopper creates duplicate fields. Both minor problems and fixable in the database.
However - this system, although large, is moderately simple. There are a small handful of well-maintained plugins, we've done a lot of standardisation and "reuse fields as much as possible". It's still messy, but not horribly so.
However you approach this, you MUST test it properly. Rig up a test system, and try a single upgrade run. If you hit problems, then go straight back to Sultan's answer for the next test run - do 4.x to 4.4.5
Oh, and I wouldn't use 5.1.4 either. Go to at least 5.1.7 and I'd recommend 5.1.8
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