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From Dmitriy Setrakyan <dsetrak...@apache.org>
Subject Re: MVCC configuration
Date Tue, 19 Sep 2017 05:39:40 GMT
On Mon, Sep 18, 2017 at 2:39 AM, Semyon Boikov <sboikov@apache.org> wrote:

> 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.

Is it possible for several caches in the same cache group to have different
MVCC configuration?

> 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.

I agree that we need coordinator nodes, but I do not understand why can't
we reuse some cache nodes for it? Why do we need to ask user to start up
yet another type of node?

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