On Fri, Jun 16, 2023 at 11:14:05AM +0900, Masahiro Ikeda wrote: > I tried to query on pg_stat_activity to check the background worker > invoked by pg_prewarm. But, I found that pg_stat_activity doesn't show > it although I may be missing something... > > So, I tried to implement TAP tests. But I have a problem with it. > I couldn't find the way to check the status of another backend > while the another backend wait with custom wait events.
Hmm. Right. It seems to me that BGWORKER_BACKEND_DATABASE_CONNECTION is required in this case, with BackgroundWorkerInitializeConnection() to connect to a database (or not, like the logical replication launcher if only access to shared catalogs is wanted). I have missed that the leader process of pg_prewarm does not use that, because it has no need to connect to a database, but its workers do. So it is not going to show up in pg_stat_activity. -- Michael
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