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From Dmitriy Setrakyan <dsetrak...@apache.org>
Subject Re: Metrics for MVCC caches
Date Tue, 07 Aug 2018 22:12:35 GMT

To your 2nd question, can you suggest a few MVCC metrics to get the
discussion started?


On Tue, Aug 7, 2018 at 9:17 AM, Павлухин Иван <vololo100@gmail.com> wrote:

> Hi Igniters,
> I am working on cache metrics support for caches with enabled MVCC. As you
> may know, during MVCC transaction execution entry versions are written to
> storage right away (without deferring until commit). So, it is not obvious
> for me if we should update writes count right away or defer it until
> commit. On one hand, MVCC entry version write is not "true" write until
> commit. On the other hand, it definitely changes the storage. How do we
> interpret write metrics in Ignite philosophy?
> Also, it seems that bunch of MVCC specific metrics could be introduced. I
> would like to collect some thoughts about it. Which such metrics come to
> your mind?
> --
> Best regards,
> Ivan Pavlukhin

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