On Sun, Jun 10, 2012 at 4:02 PM, Fujii Masao <masao.fujii@gmail.com> wrote:
> On Sun, Jun 10, 2012 at 7:55 PM, Magnus Hagander <magnus@hagander.net> wrote:
>> How about this?
>
> + /*
> + * Set flushed position to the last byte in the previous
> + * file. Per above we know that xrecoff%XLOG_SEG_SIZE=0
> + */
> + flushedpos = blockpos;
> + if (flushedpos.xrecoff == 0)
> + {
> + flushedpos.xlogid--;
> + flushedpos.xrecoff = XLogFileSize-1;
> + }
> + else
> + flushedpos.xrecoff--;
>
> flushedpos.xrecoff doesn't need to be decremented by one.
> If xrecoff % XLOG_SEG_SIZE = 0, the position should be the last
> byte of previous (i.e., flushed) WAL file.
Hmm. I thikn I confused myself with "last byte written" vs "current
position". And we're dealing with current position here...
So it should just be flushedpos = blockpos and be done with it, right?
Though before I commit anything with this, we need to decide what to
wrt syncrep on that, per the other thread.
--
Magnus Hagander
Me: http://www.hagander.net/
Work: http://www.redpill-linpro.com/