From: | "movead(dot)li(at)highgo(dot)ca" <movead(dot)li(at)highgo(dot)ca> |
---|---|
To: | "Andrey V(dot) Lepikhov" <a(dot)lepikhov(at)postgrespro(dot)ru>, "Amit Kapila" <amit(dot)kapila16(at)gmail(dot)com>, "Masahiko Sawada" <masahiko(dot)sawada(at)2ndquadrant(dot)com> |
Cc: | "Fujii Masao" <masao(dot)fujii(at)oss(dot)nttdata(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Global snapshots |
Date: | 2020-06-19 09:03:20 |
Message-ID: | 2020061917031834329360@highgo.ca |
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Thread: | |
Lists: | pgsql-hackers |
>> would like to know if the patch related to CSN based snapshot [2] is a
>> precursor for this, if not, then is it any way related to this patch
>> because I see the latest reply on that thread [2] which says it is an
>> infrastructure of sharding feature but I don't understand completely
>> whether these patches are related?
>I need some time to study this patch. At first sight it is different.
This patch[2] is almost base on [3], because I think [1] is talking about 2PC
and FDW, so this patch focus on CSN only and I detach the global snapshot
part and FDW part from the [1] patch.
I notice CSN will not survival after a restart in [1] patch, I think it may not the
right way, may be it is what in last mail "Needs guarantees of monotonically
increasing of the CSN in the case of an instance restart/crash etc" so I try to
add wal support for CSN on this patch.
That's why this thread exist.
> [1] - https://www.postgresql.org/message-id/CA%2Bfd4k4v%2BKdofMyN%2BjnOia8-7rto8tsh9Zs3dd7kncvHp12WYw%40mail.gmail.com
> [2] - https://www.postgresql.org/message-id/2020061911294657960322%40highgo.ca
[3]https://www.postgresql.org/message-id/21BC916B-80A1-43BF-8650-3363CCDAE09C%40postgrespro.ru
Regards,
Highgo Software (Canada/China/Pakistan)
URL : www.highgo.ca
EMAIL: mailto:movead(dot)li(at)highgo(dot)ca
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