Re: Streaming replication, and walsender during recovery - Mailing list pgsql-hackers

On Tue, 2010-01-19 at 15:04 +0900, Fujii Masao wrote:
> >
> > There is an ERROR, but no problem AFAICS. The tli isn't set until end of
> > recovery because it doesn't need to have been set yet. That shouldn't
> > prevent retrieving WAL data.
> 
> OK. Here is the patch which supports a walsender process during recovery;
> 
> * Change walsender so as to send the WAL written by the walreceiver
>   if it has been started during recovery.
> * Kill the walsenders started during recovery at the end of recovery
>   because replication cannot survive the change of timeline ID.

Good patch.

I think we need to add a longer comment explaining the tli issues. I
agree with your handling of them.

It would be useful to have the ps display differentiate between multiple
walsenders, and in this case have it indicate cascading also.

-- Simon Riggs           www.2ndQuadrant.com