On 6/17/13 8:23 AM, Michael Paquier wrote:
> As mentionned by Andres, the only thing that the MVCC catalog patch can
> improve here
> is the index swap phase (index_concurrent_swap:index.c) where the
> relfilenode of the
> old and new indexes are exchanged. Now an AccessExclusiveLock is taken
> on the 2 relations
> being swap, we could leverage that to ShareUpdateExclusiveLock with the
> MVCC catalog
> access I think.
Without getting rid of the AccessExclusiveLock, REINDEX CONCURRENTLY is
not really concurrent, at least not concurrent to the standard set by
CREATE and DROP INDEX CONCURRENTLY.