On 08/10/2014 12:22 PM, Simon Riggs wrote:
On 8 August 2014 16:03, Heikki Linnakangas <hlinnakan...@vmware.com> wrote:

1. MMTuple contains the block number of the heap page (range) that the tuple
represents. Vacuum is no longer needed to clean up old tuples; when an index
tuples is updated, the old tuple is deleted atomically with the insertion of
a new tuple and updating the revmap, so no garbage is left behind.

What happens if the transaction that does this aborts? Surely that
means the new value is itself garbage? What cleans up that?

It's no different from Alvaro's patch. The updated MMTuple covers the aborted value, but that's OK from a correctnes point of view.

- Heikki

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