Kevin Grittner wrote: > Hmm. The comment is probably better now, but I've been re-checking > the code, and I think my actual code change is completely wrong. > Give me a bit to sort this out.
I'm having trouble seeing a way to make this work without rearranging the code for concurrent drop to get to a state where it has set indisvalid = false, made that visible to all processes, and ensured that all scans of the index are complete -- while indisready is still true. That is the point where TransferPredicateLocksToHeapRelation() could be safely called. Then we would need to set indisready = false, make that visible to all processes, and ensure that all access to the index is complete. I can't see where it works to set both flags at the same time. I want to sleep on it to see if I can come up with any other way, but right now that's the only way I'm seeing to make DROP INDEX CONCURRENTLY compatible with SERIALIZABLE transactions. :-( -Kevin -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
