Bryan Beaudreault created HBASE-28376:
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Summary: Column family ns does not exist in region during upgrade
to 3.0.0-beta-2
Key: HBASE-28376
URL: https://issues.apache.org/jira/browse/HBASE-28376
Project: HBase
Issue Type: Bug
Reporter: Bryan Beaudreault
Upgrading from 2.5.x to 3.0.0-alpha-2, migrateNamespaceTable kicks in to copy
data from the namespace table to an "ns" family of the meta table. If you don't
have an "ns" family, the migration fails and the hmaster will crash loop. You
then can't rollback, because the briefly alive upgraded hmaster created a
procedure that can't be deserialized by 2.x (I don't have this log handy
unfortunately). I tried pushing code to create the ns family on startup, but it
doesnt work becuase the migration happens while the hmaster is still
initializing.
So it seems imperative that you create the ns family before upgrading. We
should handle this more gracefully.
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