Re: parallel pg_restore - WIP patch

Russell Smith wrote:
> I'm sorry, I meant processes there.  I'm aware there are no threads. 
> But my feeling was that when you forked with open files you got all of
> the open file properties, including positions, and as you dupped the
> descriptor, you share all that it's pointing to with every other copy of
> the descriptor.  My brief research on that shows that in 2005 there was
> a kernel mailing list discussion on this issue. 
> http://mail.nl.linux.org/kernelnewbies/2005-09/msg00479.html was quite
> informative for me.  I again could be wrong but worth a read.  If it is
> true, then the file needs to be reopened by each child, it can't use the
> duplicated descriptor.  I haven't had a change to implementation test is
> as it's late here.  But I'd take a stab that it will solve the
> compression library problems.
>
> I hope this helps, not hinders
>
>
>   

I'm sure that's the problem. Should be fairly easily fixable, I believe.

Thanks for the info.

cheers

andrew