Re: BUG #4879: bgwriter fails to fsync the file in recovery mode

Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> writes:
> One idea is to merge LocalWALWriteAllowed and LocalRecoveryInProgress
> (and the corresponding shared variables too) into one XLogState variable
> with three states
> * in-recovery
> * normal operation
> * shutdown.

> The variable would always move from a lower state to higher,

Hmm ... this doesn't really feel cleaner to me, although I'm not sure
why not. One point is that you really don't have enough states there;
there's a difference between "in recovery" and "writing end-of-recovery
checkpoint". Also, you stated that you want to disable XLogInsert again
as soon as the EOR checkpoint is written, so I don't believe that the
state sequence is really monotonic, unless you split in-recovery into
three sub-states.

On the whole I prefer keeping "InRecovery" and "XLogInsertAllowed" as
separate concepts, I think.

regards, tom lane