On 11/19/2014 08:22 AM, Alvaro Herrera wrote:
I think we're overblowing the pg_upgrade issue. Surely we don't need to preserve commit_ts data when upgrading across major versions; and pg_upgrade is perfectly prepared to remove old data when upgrading (actually it just doesn't copy it; consider pg_subtrans or pg_serial, for instance.) If we need to change binary representation in a future major release, we can do so without any trouble.
That sounds reasonable. I am okay with Petr removing the LSN portion this patch.
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