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From Dmitry Pavlov <dpavlov....@gmail.com>
Subject Re: Implementing custom affinity logic
Date Mon, 23 Jul 2018 13:17:04 GMT

 In case these questions are not related to some PR/Issue or contribution,
than user list probably is better place to ask these questions.

Dmitriy Pavlov

пн, 23 июл. 2018 г. в 13:24, kotamrajuyashasvi <kotamrajuyashasvi@gmail.com

> Hi
> I m working on an ignite project where I want to have certain records to be
> collocated based
> on a custom calculated value which is obtained from the fields of the
> primary key object.
> For example the Primary key pojos have fields a,b,c. I want all records
> having same value of (a+b)/c
> collocated on same node/partition.
> I have gone through the ignite documentation and found that custom
> AffinityKeyMapper is the
> one that can be used. Also there is an option to use custom Affinity
> function but extra logic has to be added for partition to node mapping
> etc..
> 1. How can I achieve my above requirement? What are the correct options and
> where can
>     I get a working example of custom AffinityKeyMapper or AffinityFunction
> ?
> 2. Once after achieving custom affinity how to test if all records are
> getting collocated as expected. One
>     option that I found was to use scan query and scan a particular
> partition and test each record if it
>     should actually belong to the scanned partition. But if there are huge
> number of records I'm facing
>     OOM while running scan query for a partition. So I would like to know
> how to achieve this/ test to
>     confirm for sure the collocation is as expected.
> 3. What is the performance impact of using custom affinity logic when
> compared to using no affinity and
>     using @AffinityKeyMapped annotation to achieve affinity where the
> scenario is to collocate based on
>     a single field.
> 4. When using @AffinityKeyMapped or no affinity is used, is
> org.apache.ignite.internal.processors.cache.GridCacheDefaultAffinityKeyMapper
> is used as default
>     AffinityKeyMapper ? or there is any other default module that is used
> for calculating affinity ?
> --
> Sent from: http://apache-ignite-developers.2346864.n4.nabble.com/

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