Обсуждение: [GENERAL] Two-phase commit case studies
Hello, I've read the documentation for two-phase commit and it sounds interesting, but I'm having trouble thinking of how to actually put it into production. How are people using it? Do you use a XA transaction manager or something custom built? How dos the reconciliation work when a component crashes between PREPARE and COMMIT? Is anyone using it in the open-source world where transaction managers are unheard of? Looking forward to hearing about how two-phase commit has helped you. Thanks
On Wed, Jul 19, 2017 at 7:10 PM, Gavin Wahl <gwahl@fusionbox.com> wrote: > I've read the documentation for two-phase commit and it sounds interesting, but > I'm having trouble thinking of how to actually put it into production. How are > people using it? Do you use a XA transaction manager or something custom built? > How dos the reconciliation work when a component crashes between PREPARE and > COMMIT? Is anyone using it in the open-source world where transaction managers > are unheard of? > > Looking forward to hearing about how two-phase commit has helped you. One direct use of 2PC, which is for what it has been originally designed, is to ensure the consistency of a transaction commit across multiple servers. One thing using extensively 2PC is for example Postgres-XL (formerly Postgres-XC that introduced the concept), to commit a transaction across nodes when a transaction involves writes to multiple nodes. Postgres JDBC has XA support by the way: https://jdbc.postgresql.org/documentation/faq.html#xa-support -- Michael
Gavin Wahl <gwahl@fusionbox.com> writes: > Hello, > > I've read the documentation for two-phase commit and it sounds interesting, but > I'm having trouble thinking of how to actually put it into production. How are > people using it? Do you use a XA transaction manager or something custom built? > How dos the reconciliation work when a component crashes between PREPARE and > COMMIT? Is anyone using it in the open-source world where transaction managers > are unheard of? > > Looking forward to hearing about how two-phase commit has helped you. I use it for holding an advisory lock the duration of any of our several environment mangling frameworks. We have fairly complex 1-touch provisioning, decom, upgrade... rename/relocate/snapshot frameworks. The lock is used to enforce cooperatively that no one else launches any of those systems concurrently due to some interesting potential conflicts. > > Thanks -- Jerry Sievers Postgres DBA/Development Consulting e: postgres.consulting@comcast.net p: 312.241.7800