Re: Nested xacts: looking for testers and review

I have tested the patches with May 28 16:20 JST snapshot. Here is my
first impression:

1) errors, rules regression tests are failed (I'm not sure this is due
to your patches)

2) certain behavior was different from what I expected (please correct me
if my expectation is wrong).

test=# begin;
BEGIN
test=# insert into t1 values(1);
INSERT 17216 1
test=# begin;
BEGIN
test=# aaa;
ERROR: syntax error at or near "aaa" at character 1
ERROR: syntax error at or near "aaa" at character 1
LINE 1: aaa;
^
test=# end;
COMMIT
test=# select * from t1; <-- I thought this should work since subtransaction was closed
ERROR: current transaction is aborted, commands ignored until end of transaction block
ERROR: current transaction is aborted, commands ignored until end of transaction block
test=# end;
COMMIT
test=# select * from t1;
i
---
(0 rows)

3) no docs found in the patches.

> Hackers,
>
> Ok, I've finally coded solutions to most problems regarding nested
> transactions. This means:
>
> - reversing for the lock manager, catcache, relcache, buffer manager,
> asynchronous notifies, storage manager.
>
> - transaction block state support, including appropiate XLog recording
>
> - pg_subtrans subsystem (including changing state from SUBTRANS
> COMMITTED to COMMITTED when appropiate). Also pg_clog XLog recovery
> was handed to SLRU so pg_subtrans and pg_clog share a rmgr identity.
>
> - visibility rules.
>
> I'm missing one item: deferred triggers. The problem with this is that
> the deftrig queue is not implemented using normal Lists, so there's no
> efficient way to reassign to the parent when the subtransaction commits.
> Also I'm not sure what should happen to the "immediate" pointer --- a
> subtransaction should have it's own private copy, or it should inherit
> the parent's? Please whoever implemented this speak up (Stephan
> Szabo?), as I'm not sure of the semantics.
>
>
> I have tested it and it passes all regression tests (including ones I
> added), plus some more tests I threw at it mainly for concurrency.
> Everything behaves as expected. At this time I'd like to have it
> reviewed by the critic eye of the committers, and tested by whoever
> would be using it.
>
> I'm open for comments and suggestions and general input. Thank you.
>
> --
> Alvaro Herrera (<alvherre[a]dcc.uchile.cl>)
> La web junta la gente porque no importa que clase de mutante sexual seas,
> tienes millones de posibles parejas. Pon "buscar gente que tengan sexo con
> ciervos incendiánse", y el computador dirá "especifique el tipo de ciervo"
> (Jason Alexander)
>
>
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