On 2/19/25 06:08, t.maintz@fz-juelich.de wrote:
We are currently planning to migrate from mailman2 to mailman3 as a container, have around 1500 lists and would like to complete the migration ideally in a few hours. We would like to switch off mailman2 to have a defined state of the lists and import them to mailman3. The import of all lists via script takes about 3 days. Parallelizing the imports does not work due to lockings in the database. However, we cannot accept a downtime of 3 days. Does anyone have tips on how we can speed up the procedure or are there best practices for larger environments?
What Mailman 3 version are you importing to? I ask because prior to Mailman core 3.3.1, user's passwords were imported and the encryption of the password was quite time consuming. If in fact you are importing to Mailman <3.3.1, see https://gitlab.com/mailman/mailman/-/merge_requests/565 for a patch that will speed this up considerably and see https://mail.python.org/archives/list/mailman-developers@python.org/thread/4... for discussion of this change.
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