[IGNITE-13671] Support collocation based on multiple fields

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Fix Version/s: 3.0
• Labels: ignite-3
• Ignite Flags: Docs Required, Release Notes Required
• Assignee: Unassigned
• Reporter: Valentin Kulichenko
• Created: 04/Nov/20 09:03
• Updated: 04/Nov/20 09:03

Description

In Ignite 2.x there are two ways to configure collocation: @AffinityKeyMapped annotation and CacheKeyConfiguration bean. Both allow specifying only one field to be used for collocation.

Let's say there is a key class that looks like this:

class MyCacheKey {
    int a;
    int b;
    int c;
}

In this case, there is no way to collocate the data based on a pair of fields (e.g. a and b).

In 3.0, we should have an API that would allow to specify two or more fields to be used for collocation.