Re: Avoid streaming the transaction which are skipped (in corner cases)

On Fri, Nov 25, 2022 at 4:04 PM Ashutosh Bapat
<ashutosh.bapat.oss@gmail.com> wrote:
>
> Excellent catch. We were looking at this code last week and wondered
> the purpose of this abort. Probably we should have some macro or
> function to decided whether to skip a transaction based on log record.
> That will avoid using different values in different places.

We do have a common function i.e. SnapBuildXactNeedsSkip() but there
are two problems 1) it has a dependency on the input parameter so the
result may vary based on the input 2) this is only checked based on
the LSN but there are other factors dbid and originid based on those
also transaction could be skipped during DecodeCommit.  So I think one
possible solution could be to remember a dbid and originid in
ReorderBufferTXN as soon as we get the first change which has valid
values for these parameters.  And now as you suggested have a common
function that will be used by streaming as well as by DecodeCommit to
decide on whether to skip or not.

-- 
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com