Re: [HACKERS] First draft of snapshot snapshot building design document

2012-10-19 Thread Andres Freund
Hi, On Friday, October 19, 2012 10:53:06 PM Peter Geoghegan wrote: > On 16 October 2012 12:30, Andres Freund wrote: > > Here's the first version of the promised document. I hope it answers most > > of the questions. > > This makes for interesting reading. Thanks. > Step 14 *is* kind-of releva

Re: [HACKERS] First draft of snapshot snapshot building design document

2012-10-19 Thread Peter Geoghegan
On 16 October 2012 12:30, Andres Freund wrote: > Here's the first version of the promised document. I hope it answers most of > the questions. This makes for interesting reading. So, I've taken a closer look at the snapshot building code in light of this information. What follows are my thoughts

Re: [HACKERS] First draft of snapshot snapshot building design document

2012-10-19 Thread Andres Freund
On Friday, October 19, 2012 06:38:30 PM Robert Haas wrote: > On Thu, Oct 18, 2012 at 11:20 AM, Andres Freund wrote: > > 2) We need to decide whether a HEAP[1-2]_* record did catalog changes > > when building/updating snapshots. Unfortunately we also need to do this > > *before* we built the first

Re: [HACKERS] First draft of snapshot snapshot building design document

2012-10-19 Thread Robert Haas
On Thu, Oct 18, 2012 at 11:20 AM, Andres Freund wrote: > On Thursday, October 18, 2012 04:47:12 PM Robert Haas wrote: >> On Tue, Oct 16, 2012 at 7:30 AM, Andres Freund > wrote: >> > On Thursday, October 11, 2012 01:02:26 AM Peter Geoghegan wrote: >> >> The design document [2] really just explains

Re: [HACKERS] First draft of snapshot snapshot building design document

2012-10-18 Thread Andres Freund
On Thursday, October 18, 2012 04:47:12 PM Robert Haas wrote: > On Tue, Oct 16, 2012 at 7:30 AM, Andres Freund wrote: > > On Thursday, October 11, 2012 01:02:26 AM Peter Geoghegan wrote: > >> The design document [2] really just explains the problem (which is the > >> need for catalog metadata at a

Re: [HACKERS] First draft of snapshot snapshot building design document

2012-10-18 Thread Robert Haas
On Tue, Oct 16, 2012 at 7:30 AM, Andres Freund wrote: > On Thursday, October 11, 2012 01:02:26 AM Peter Geoghegan wrote: >> The design document [2] really just explains the problem (which is the >> need for catalog metadata at a point in time to make sense of heap >> tuples), without describing th

[HACKERS] First draft of snapshot snapshot building design document

2012-10-16 Thread Andres Freund
Hi All, On Thursday, October 11, 2012 01:02:26 AM Peter Geoghegan wrote: > The design document [2] really just explains the problem (which is the > need for catalog metadata at a point in time to make sense of heap > tuples), without describing the solution that this patch offers with > any degree