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From Николай Ижиков <nizhikov....@gmail.com>
Subject Re: MVCC configuration
Date Mon, 18 Sep 2017 10:01:48 GMT
Hello, Semyon!

> It seems we need introduce special 'dedicated mvcc coordinator' node role

How will Ignite handle "mvcc coordinator" fail?

What will happen with if coordinator fails in the middle of a transaction?
Could tx be committed or rollbacked?

Will we have some user notification if coordinator becomes slower?

> IgniteConfiguration.isMvccCoordinator

flag name seems OK.

2017-09-18 12:39 GMT+03:00 Semyon Boikov <sboikov@apache.org>:

> Hi all,
> Currently I'm working on MVCC feature (IGNITE-3478) and need your opinion
> on related configuration options.
> 1. MVCC will definitely bring some performance overhead, so I think it
> should not be enabled by default, I'm going to add special flag on cache
> configuration: CacheConfiguration.isMvccEnabled.
> 2. In current mvcc architecture there should be some node in cluster
> assigning versions for tx updates and queries (mvcc coordinator). Mvcc
> coordinator is crucial component and it should perform as fast as possible.
> It seems we need introduce special 'dedicated mvcc coordinator' node role:
> it should not be possible to start cache on such node and it should not
> process user's compute jobs. At the same time it should be possible that
> any regular server node can become mvcc coordinator: this can be useful
> during development (no extra setup for mvcc will be needed), or support
> scenario when all dedicated coordinator nodes fail. So we need a way to
> make node a 'dedicated mvcc coordinator', we can add special flag on ignite
> configuration: IgniteConfiguration.isMvccCoordinator.
> What do you think?
> Thanks

Nikolay Izhikov

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