| From: | "tsunakawa(dot)takay(at)fujitsu(dot)com" <tsunakawa(dot)takay(at)fujitsu(dot)com> |
|---|---|
| To: | "Andrey V(dot) Lepikhov" <a(dot)lepikhov(at)postgrespro(dot)ru>, "movead(dot)li(at)highgo(dot)ca" <movead(dot)li(at)highgo(dot)ca> |
| Cc: | 'Amit Kapila' <amit(dot)kapila16(at)gmail(dot)com>, Masahiko Sawada <masahiko(dot)sawada(at)2ndquadrant(dot)com>, Fujii Masao <masao(dot)fujii(at)oss(dot)nttdata(dot)com>, PostgreSQL-Dev <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | RE: Global snapshots |
| Date: | 2020-07-27 06:22:45 |
| Message-ID: | TYAPR01MB29902D8B671A5A6946F5AEA8FE720@TYAPR01MB2990.jpnprd01.prod.outlook.com |
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| Lists: | pgsql-hackers |
Hi Andrey san, Movead san,
From: tsunakawa(dot)takay(at)fujitsu(dot)com <tsunakawa(dot)takay(at)fujitsu(dot)com>
> While Clock-SI seems to be considered the best promising for global
> serializability here,
>
> * Why does Clock-SI gets so much attention? How did Clock-SI become the
> only choice?
>
> * Clock-SI was devised in Microsoft Research. Does Microsoft or some other
> organization use Clock-SI?
Could you take a look at this patent? I'm afraid this is the Clock-SI for MVCC. Microsoft holds this until 2031. I couldn't find this with the keyword "Clock-SI.""
US8356007B2 - Distributed transaction management for database systems with multiversioning - Google Patents
https://patents.google.com/patent/US8356007
If it is, can we circumvent this patent?
Regards
Takayuki Tsunakawa
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