May 14, 2011

Perhaps a useful Plone 4 migration hint: clear the catalog first

During the migration of my company site from Plone 3 to Plone 4 I came across some issues with the migration tool where the migration tool tried to do something (no idea what) with non-existing content-objects (obviously stale catalog entries) portal_migration never terminated with success.

So I tried to be smart and cleared the portal_catalog (Advanced tab of the portal_catalog -> Clear catalog) first. After that I started the migration again and it finished successfully. After that I went to portal_catalog again and used Clear and Rebuild to re-create the portal_catalog from scratch. All content showed up as expected. Not sure if this is a general good advice but perhaps it might help in some situations with migration issues.