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From Vyacheslav Daradur <daradu...@gmail.com>
Subject Re: Eviction policies with persistence
Date Thu, 01 Feb 2018 06:53:18 GMT
Hi Valentin,

As far as I know, when persistence is enabled and Ignite can't
allocate new page-memory in the memory segment, then Ignite
automatically evict some data from RAM to PDS using Random-2-LRU
eviction algorithm. And there are no mechanisms to evict entries out
when PDS is enabled.

I'll be glad if I am not right and someone will correct me because, as
Ignite user, I can't use PDS only as RAM disk replication for the use
case in my project.


On Thu, Feb 1, 2018 at 3:53 AM, Valentin Kulichenko
<valentin.kulichenko@gmail.com> wrote:
> Folks,
>
> On "Eviction Policies" documentation page [1] we have the following callout:
>
>> Configured eviction policy has no effect if Ignite persistence is enabled
>> Note that if Ignite Persistence is enabled, then the page-based evictions
> have no effect because the oldest pages will be purged from memory
> automatically.
>
> This really confuses me. Why is there a difference in how data is evicted
> from memory depending on having disk enabled or not? And how does eviction
> work with persistence enabled then?
>
> Does anyone can clarify?
>
> [1] https://apacheignite.readme.io/docs/evictions
>
> -Val



-- 
Best Regards, Vyacheslav D.

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