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From Dmitry Pavlov <dpavlov....@gmail.com>
Subject Re: Ignite Durable Memory & Persistent Store introduction for developers
Date Fri, 01 Sep 2017 17:43:54 GMT
Hi Denis,

Sure, I would be glad if you have some time to review the page. Thank you
for edits and careful review!

According to recent questions and feedback from Igniters, I would also like
to extend section about memory organization.

Please give me a couple of days to address your questions and extend wiki.

Sincerely,
Dmitriy Pavlov


пт, 1 сент. 2017 г. в 19:50, Denis Magda <dmagda@apache.org>:

> Dmitriy,
>
> First of all, thanks for putting this low level details on paper! Current
> and future community members will be grateful to you.
>
> Second, let me be a reviewer of the page and suggest some improvements.
> Until the review is over I would encourage us to hold on with any public
> announcements such as blog post.
>
> I’ve reviewed and edited Ignite Durable Memory section (
> https://cwiki.apache.org/confluence/display/IGNITE/Ignite+Durable+Memory+-+under+the+hood#IgniteDurableMemory-underthehood-IgniteDurableMemory
> <
> https://cwiki.apache.org/confluence/display/IGNITE/Ignite+Durable+Memory+-+under+the+hood#IgniteDurableMemory-underthehood-IgniteDurableMemory>).
> Please address the questions below and I’ll move on with the new sections
> afterwards.
>
> 1) "Different caches and its partitions bring more complex addressing
> scheme but it is still possible to map from page ID to position in
> particular file: pageId => file + offset in this file”.
>
> Probably this appears too early in the doc because above we just
> introduced page ID notion with durable memory and now we’re talking about
> some files? Are these files of ignite persistence? What if the persistence
> is disabled? Honestly, the sentence gets out of the story context.
>
>
> 2) "Also, the tree pages can be merged into one if < 50% of space is used.”
>
> 50% of the whole memory available? Please clarify.
>
>
> 3) "There is one page ID table per memory segment.”
>
> It’s the same segment as it’s described in the main doc, right?
> https://apacheignite.readme.io/docs/memory-architecture#section-memory-segment
> <
> https://apacheignite.readme.io/docs/memory-architecture#section-memory-segment
> >
>
>
> 4) "within unsafe segment”
>
> If we want to mention “usafe” here we need to explain what that is.
>
> 5) "If memory amount less than whole index size, Ignite still can operate.”
>
> How do we define “index size”? Is this the page size?
>
>
> —
> Denis
>
>
> > On Aug 30, 2017, at 8:24 AM, Dmitry Pavlov <dpavlov.spb@gmail.com>
> wrote:
> >
> > Hi Igniters,
> >
> >
> > I am glad to introduce two new wiki articles. These articles contain
> > high-level description of
> >
> > - Ignite Durable Memory (
> >
> https://cwiki.apache.org/confluence/display/IGNITE/Ignite+Durable+Memory+-+under+the+hood
> > )
> >
> > - and Ignite Persistent Store (
> >
> https://cwiki.apache.org/confluence/display/IGNITE/Ignite+Persistent+Store+-+under+the+hood
> > )
> >
> > These articles cover basic principles and internal design. Pages may be
> > useful for new contributors during start of working with persistent store
> > code base.
> >
> >
> > I would like to thank all contributors who helped me with my questions.
> > Their answers and support made it possible to start this description.
> >
> >
> > I will appreciate any feedback and questions. Suggestions and edits are
> > welcome, of course.
> >
> >
> > Sincerely,
> >
> > Dmitriy Pavlov
>
>

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