On Wed, Jun 22, 2016 at 10:13 PM, Amit Kapila <amit.kapil...@gmail.com> wrote: >> A scan that has seen the flag won't look at the >> tuple in any case. > > Why so? Assume that scan started on new bucket where > split-in-progress flag was set, now it will not look at tuples that > are marked as moved-by-split in this bucket, as it will assume to find > all such tuples in old bucket. Now, if allow Vacuum or someone else > to remove tuples from old with just an Exclusive lock, it is quite > possible that scan miss the tuple in old bucket which got removed by > vacuum.
Oh, you're right. So we really need to CLEAR the split-in-progress flag before removing any tuples from the old bucket. Does that sound right? -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
