Re: logical streaming of xacts via test_decoding is broken

On Tue, Nov 10, 2020 at 11:18 AM Dilip Kumar <dilipbalaut(at)gmail(dot)com> wrote:
>
> On Tue, Nov 10, 2020 at 10:52 AM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> >
> > On Tue, Nov 10, 2020 at 10:26 AM Dilip Kumar <dilipbalaut(at)gmail(dot)com> wrote:
> > >
> > > On Tue, Nov 10, 2020 at 8:14 AM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> > > >
> > > > On Mon, Nov 9, 2020 at 6:00 PM Dilip Kumar <dilipbalaut(at)gmail(dot)com> wrote:
> > > > >
> > > > > On Mon, Nov 9, 2020 at 5:37 PM Dilip Kumar <dilipbalaut(at)gmail(dot)com> wrote:
> > > > > >
> > > > > > On Mon, Nov 9, 2020 at 4:21 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> > > > > >
> > > > > > The bigger question is do we want to give users an option
> > > > > > > for skip_empty_streams similar to skip_empty_xacts? I would again
> > > > > > > prefer to give a separate option to the user as well. What do you
> > > > > > > think?
> > > > > >
> > > > > > Yeah, I think giving an option would be better.
> > > > >
> > > > > I think we should also think about the combinations of the
> > > > > skip_empty_xacts and skip_empty_streams. For example, if the user
> > > > > passes the skip_empty_xacts to false and skip_empty_streams to true
> > > > > then what should be the behavior, if the complete transaction
> > > > > option1: It should not print any stream_start/stream_stop and just
> > > > > print commit stream because skip_empty_xacts is false and
> > > > > skip_empty_streams is true.
> > > > > option2: It should print the stream_start message for the very first
> > > > > stream because it is the first stream if the txn and skip_empty_xacts
> > > > > is false so print it and later it will print-stream commit.
> > > > > option3: Or for the first stream we first put the BEGIN message i.e
> > > > > stream begin
> > > > > stream start
> > > > > stream stop
> > > > > stream commit
> > > > > option4: the user should not be allowed to pass skip_empty_xacts =
> > > > > false with skip_empty_streams to true. Because if the streaming mode
> > > > > is on then we can not print the xact without printing streams.
> > > > >
> > > > > What is your opinion on this?
> > > > >
> > > >
> > > > I would prefer option-4 and in addition to that we can ensure that if
> > > > skip_empty_xacts = true then by default skip_empty_streams is also
> > > > true.
> > >
> > > But then it will behave as a single option only, right? because if
> > > 1. skip_empty_xacts = true, then we set skip_empty_streams = true
> > >
> >
> > For this case, users can use skip_empty_xacts = true and
> > skip_empty_streams = false. I am just asking if the user has only used
> > skip_empty_xacts = true and didn't use the 'skip_empty_streams'
> > option.
>
> Ok, thanks for the clarification.
>

I have prepared a patch for the same.

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