RE: Parallel Apply

Dear Amit,

> It seems you haven't sent the patch that preserves commit order or the
> commit message of the attached patch is wrong. I think the first patch
> in series should be the one that preserves commit order and then we
> can build a patch that tracks dependencies and allows parallelization
> without preserving commit order.

I think I attached the correct file. Since we are trying to preserve the commit
order by default, everything was merged into one patch.
One point to clarify is that dependency tracking is essential even if we fully
preserve the commit ordering not to violate constrains like PK. Assuming there is
a table which has PK, txn1 inserts a tuple and txn2 updates it. UPDATE statement
in txn2 must be done after committing txn1.

> I feel it may be better to just
> discuss preserve commit order patch that also contains some comments
> as to how to extend it further, once that is done, we can do further
> discussion of the other patch.

I do agree, let me implement one by one.

Best regards,
Hayato Kuroda
FUJITSU LIMITED