Hi hackers, The SLRU managed by predicate.c can wrap around and overwrite data if you have more than 1 billion active XIDs. That's because when SSI was implemented, slru.c was limited to four digit segment names, which implied a page limit that wasn't enough for pg_serial to have space for every possible XID. We should probably rip that code out, because SLRUs now support five digit segment names. Something like the attached. I'll post a test script to demonstrate correct wraparound behaviour around in time for one of the later CFs.
-- Thomas Munro http://www.enterprisedb.com
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