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From "Vladislav Pyatkov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-2655) AffinityFunction: primary and backup copies in different locations
Date Tue, 31 May 2016 08:14:13 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-2655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15307412#comment-15307412
] 

Vladislav Pyatkov commented on IGNITE-2655:
-------------------------------------------

Small description of my changes:
Added AffinityBackupFilter for FairAffinityFunction and RendezvousAffinityFunction (The method
is setAffinityBackupFilter).
Interface for affinity backup filter is
public boolean apply (Node n, List <Node> assigned)
Where
n - potential backup to check
assignd -  list of current partition holders (for RendezvousAffinityFunction first node in
the list is primary)
result - if can assign true, false another.

Use as follows:
{code}
RendezvousAffinityFunction aff = new RendezvousAffinityFunction(false);
aff.setAffinityBackupFilter(new IgniteBiPredicate<ClusterNode, List<ClusterNode>>()
{
	@Override public boolean apply(ClusterNode node, List<ClusterNode> nodes) {
		return false;
    }
});
{code}

Old method setBackupFilter marked as Deprecated.


> AffinityFunction: primary and backup copies in different locations
> ------------------------------------------------------------------
>
>                 Key: IGNITE-2655
>                 URL: https://issues.apache.org/jira/browse/IGNITE-2655
>             Project: Ignite
>          Issue Type: Bug
>            Reporter: Denis Magda
>            Assignee: Vladislav Pyatkov
>            Priority: Critical
>              Labels: important
>             Fix For: 1.7
>
>
> There is a use case when primary and backup copies have to be located in different racks,
building, cities, etc.
> A simple scenario is the following. When nodes are started they will have either "rack1"
or "rack2" value in their attributes list and we will enforce that the backups won't be selected
among the nodes with the same attribute.
> It should be possible to filter out backups using IP addresses as well.
> Presently rendezvous and fair affinity function has {{backupFilter}} that will work perfectly
for the scenario above but only for cases when number of backups for a cache is equal to 1.
> In case when the number of backups is bigger than one {{backupFilter}} will only guarantee
that the primary is located in different location but will NOT guarantee that all the backups
are spread out across different locations as well.
> So we need to provide an API that will allow to spread the primary and ALL backups copies
across different locations.
> The proposal is to introduce {{AffinityBackupFilter}} with the following method
> {{AffinityBackupFilter.isAssignable(Node n, List<Node> assigned)}}
> Where n - potential backup to check, assigned - list of current partition holders, 1st
is primary
> {{AffinityBackupFilter}} will be set using {{affinity.setAffinityBackupFilter}}.
> {{Affinity.setBackupFilter}} has to be deprecated.



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