Re: [HACKERS] Sync Rep: Second thoughts

2008-12-24 Thread Emmanuel Cecchet
Hi Markus, I didn't have much reliability issues with ensemble, appia or spread, so far. Although, I admit I didn't ever run any of these in production. Performance is certainly an issue, yes. I may suggest another reading even though a bit dates, most of the results still apply: http://jmo

Re: [HACKERS] Sync Rep: Second thoughts

2008-12-23 Thread Markus Wanner
Hello Emmanuel, Emmanuel Cecchet wrote: > What Bettina calls the Lock Phase in > http://www.cs.mcgill.ca/~kemme/papers/vldb00.pdf is actually a > certification. Aha. Hm.. that has gone since Postgres-R (SI) and doesn't exist anymore in my current version either (so far called Postgres-R (8)). Mos

Re: [HACKERS] Sync Rep: Second thoughts

2008-12-22 Thread Emmanuel Cecchet
Hi Markus, I'm not quite sure what you mean by "certification protocol", there's no such thing in Postgres-R (as proposed by Kemme). Although, I remember having heard that term in the context of F. Pedone's work. Can you point me to some paper explaining this certification protocol? What Bett

Re: [HACKERS] Sync Rep: Second thoughts

2008-12-21 Thread Markus Wanner
Hello Emmanuel, Emmanuel Cecchet wrote: > I am happy to see that Postgres-R is alive again. The paper was written > in 07 (and published in 08, the review process is longer than a > CommitFest ;-)) and at the time of the writing there was no version of > Postgres-R available, hence the 'obsolete'

Re: [HACKERS] Sync Rep: Second thoughts

2008-12-21 Thread Emmanuel Cecchet
Hi Markus, I am happy to see that Postgres-R is alive again. The paper was written in 07 (and published in 08, the review process is longer than a CommitFest ;-)) and at the time of the writing there was no version of Postgres-R available, hence the 'obsolete' mention referring to past versio

Re: [HACKERS] Sync Rep: Second thoughts

2008-12-21 Thread Markus Wanner
Hi, Emmanuel Cecchet wrote: > What the application is going to see is a failure when the postmaster it > is connected to is going down. If this happen at commit time, I think > that there is no guarantee for the application to know what happened: > 1. failure occurred before the request reached po

Re: [HACKERS] Sync Rep: Second thoughts

2008-12-14 Thread Emmanuel Cecchet
Hi all, I just wanted to point out a detail that I have not seen mentioned in this thread (but I might have skipped some messages and I apologize in advance if this is a duplicate). What the application is going to see is a failure when the postmaster it is connected to is going down. If thi