Re: ThisTimeLineID in checkpointer and bgwriter processes

On Thursday, December 20, 2012 7:03 PM Simon Riggs wrote:
> On 20 December 2012 13:19, Amit Kapila <amit.kapila@huawei.com> wrote:
> 
> >> So I think we're good on that front. But I'll add a comment there,
> and
> >> use 0 explicitly instead of ThisTimeLineID, for clarity.
> >
> > True, it might not have any functionality effect in
> RemoveOldXlogFiles().
> > However it can be used in PreallocXlogFiles()->XLogFileInit() as
> well.
> 
> PreallocXlogFiles() should have been put to the sword long ago. It's a
> performance tweak aimed at people without a performance problem in
> this area.

Yes, it seems to be for a rare scenario. 
> I'll happily accept this excuse to remove it.
> 
> We can discuss whether any replacement is required.

We should think of alternatives if there is no other reasonable fix for the
problem.

With Regards,
Amit Kapila.