Re: XMin Hot Standby Feedback patch

On 15.02.2011 18:42, Simon Riggs wrote:
> On Sat, 2011-02-12 at 14:11 -0800, Daniel Farina wrote:
>> This is another bit of the syncrep patch split out.
>>
>> I will revisit the replication timeout one Real Soon, I promise -- but
>> I have a couple things to do today that may delay that until the
>> evening.
>>
>> https://github.com/fdr/postgres/commit/ad3ce9ac62f0e128d7d1fd20d47184f867056af1
>>
>> Context diff supplied here.
>
> Greg just tipped me off to this thread a few hours ago. I saw your other
> work on timeouts which looks good.
>
> I've reworked this feature myself, and its roughly the same thing you
> have posted, so I will just add on to this thread. The major change from
> my earlier patch is that the logic around setting xmin on the master is
> considerably tighter, and correctly uses locking.

It would be wise to also transmit the epoch in addition to xmin, to 
avoid confusion if the standby is > 2 billion transactions behind.

--   Heikki Linnakangas  EnterpriseDB   http://www.enterprisedb.com