RE: Fix stats reporting delays in logical parallel apply worker

On Friday, April 17, 2026 11:01 AM Zhijie Hou (Fujitsu) <houzj(dot)fnst(at)fujitsu(dot)com> wrote:
> Hi,
>
> When implementing another feature, I noticed that parallel apply workers
> currently do not report statistics while idle in their main loop. This can cause
> stats from the last processed transaction to be arbitrarily delayed, especially
> when there are long gaps between streamed transactions.
>
> The issue is demonstrated in 0002, where a TAP test fails when attempting to
> collect stats from a parallel apply worker that has no subsequent transaction
> to
> trigger a stats report.
>
> 0001 fixes this issue by forcing a stats report when the worker is idle in the
> main loop, matching the behavior already present in LogicalRepApplyLoop()
> for
> regular logical apply workers.

Regarding 0002, I realized that the streaming option is now set to 'parallel' by
default so can avoid adjusting the option again. The test needs to be adjusted
to increase the worker limit so that a parallel worker can start. Here are the
updated patches.

Best Regards,
Hou zj