64-bit TXID?

Hi,

A recent discussion in Slashdot brought up the topic of PostgreSQL's 32-bit
TXID system: http://slashdot.org/comments.pl?sid=5725497&cid=47942637

I did a quick search and noticed that 8 years ago, a Skype employee provided
a patch for migrating to a 64-bit TXID:
http://postgresql.1045698.n5.nabble.com/RFC-txid-module-for-64-bit-external-transaction-IDs-tt1947503.html

The conversation seemed to die there (I couldn't find any follow-up).

If I were Facebook (which clearly I am not) should I be worried about this
sort of thing? And out of curiosity, why didn't PostgreSQL migrate to a
64-bit value?

Thanks,
Gili

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