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From Ivan Rakov <ivan.glu...@gmail.com>
Subject Re: Persistence per memory policy configuration
Date Mon, 02 Oct 2017 12:19:08 GMT

I like your approach because it's easier to implement.

However, user may be confused by setting *isDefaultPersistenceEnabled* 
flag and seeing that persistence is not enabled by default in custom 
memory region. I'll add clarifying Javadoc at this place.

Best Regards,
Ivan Rakov

On 02.10.2017 11:28, Vladimir Ozerov wrote:
> Ivan,
> I do not think this is correct approach, because it will be hard to
> explain, and you will have to use "Boolean" instead of "boolean" for
> DataRegionConfiguration. I do not think we need default "persistence
> enabled" for all regions. Instead, we should have "persistence enabled"
> flag for default region only. It should not be propagated to custom regions.
> On Mon, Oct 2, 2017 at 11:14 AM, Ivan Rakov <ivan.glukos@gmail.com> wrote:
>> Guys, I think I got the point now.
>> Let's check the final design:
>> *DataStorageConfiguration* will have *isDefaultPersistenceEnabled*
>> property (default = false), which will be used for enabling persistence in
>> default data region.
>> *DataRegionConfiguration* will have *isPersistenceEnabled* property, which
>> will be used for enabling persistence in corresponding data region. If
>> value is not set, value of *DataStorageConfiguration::isDefaultPersistenceEnabled*
>> will be used by default.
>> Best Regards,
>> Ivan Rakov
>> On 02.10.2017 7:49, Dmitriy Setrakyan wrote:
>>> On Mon, Oct 2, 2017 at 7:46 AM, Denis Magda <dmagda@apache.org> wrote:
>>> On Oct 1, 2017, at 4:41 AM, Ivan Rakov <ivan.glukos@gmail.com> wrote:
>>>>> 1) You're right. I forgot to include the main flag in
>>>> DataRegionConfiguration - *isPersistenceEnabled*. Persistence will be
>>>> enabled globally if at least one memory region has this flag set.
>>>> I’m confused. Why the persistence should be enabled *globally* if the
>>>> purpose is to have it set for a specific region? If it’s enabled for
>>>> region
>>>> A only, I don’t want to have it activated for region B.
>>>> Yes, you are right. By default the persistence will be disabled globally.
>>> But we should also give users a way to switch the default behavior from
>>> in-memory only (no-persistence) to persistence.

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