RE: Skipping logical replication transactions on subscriber side

On Tues, Aug 17, 2021 1:01 PM Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> wrote:
> On Mon, Aug 16, 2021 at 3:59 PM houzj(dot)fnst(at)fujitsu(dot)com <houzj(dot)fnst(at)fujitsu(dot)com> wrote:
> > 3)
> > Do we need to invoke set_apply_error_context_xact() in the function
> > apply_handle_stream_prepare() to save the xid and timestamp ?
>
> Yes. I think that v8-0001 patch already set xid and timestamp just after parsing
> stream_prepare message. You meant it's not necessary?

Sorry, I thought of something wrong, please ignore the above comment.

>
> I'll submit the updated patches soon.

I was thinking about the place to set the errcallback.callback.

apply_dispatch(StringInfo s)
{
LogicalRepMsgType action = pq_getmsgbyte(s);
+ ErrorContextCallback errcallback;
+ bool set_callback = false;
+
+ /*
+ * Push apply error context callback if not yet. Other fields will be
+ * filled during applying the change. Since this function can be called
+ * recursively when applying spooled changes, we set the callback only
+ * once.
+ */
+ if (apply_error_callback_arg.command == 0)
+ {
+ errcallback.callback = apply_error_callback;
+ errcallback.previous = error_context_stack;
+ error_context_stack = &errcallback;
+ set_callback = true;
+ }
...
+ /* Pop the error context stack */
+ if (set_callback)
+ error_context_stack = errcallback.previous;

It seems we can put the above code in the function LogicalRepApplyLoop()
around invoking apply_dispatch(), and in that approach we don't need to worry
about the recursively case. What do you think ?

Best regards,
Hou zj