[jira] [Updated] (IGNITE-4378) Affinity function should support assigning partition to subset of cluster nodes

["Vladimir Ozerov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-4378?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vladimir Ozerov updated IGNITE-4378:
------------------------------------
    Fix Version/s:     (was: 2.1)
                   2.2

> Affinity function should support assigning partition to subset of cluster nodes
> -------------------------------------------------------------------------------
>
>                 Key: IGNITE-4378
>                 URL: https://issues.apache.org/jira/browse/IGNITE-4378
>             Project: Ignite
>          Issue Type: New Feature
>          Components: cache
>            Reporter: Dmitriy Setrakyan
>            Assignee: Alexei Scherbakov
>             Fix For: 2.2
>
>
> Currently both default affinity function(AF) implementations randomly choose primary node among all topology nodes.
> This may not be enough to handle complex data placement scenarios without implementing own AF.
> On example, some partitions can be assigned to more powerful hardware, or limited to subset of cluster nodes due to ease of management or fault tolerance scenarios.
> We should implement node filter, which will allow to choose subset of cluster nodes to place primary and backup partitions.
> With already existing ability to filter backup nodes (using {{AffinityBackupFilter}}) it will allow to implement different approaches to data placement with Ignite without resorting to custom AF.
> It's also desirable to include a practical example of both topology filters based on node attribute values.
> Proposed primary filter interface is below.
> {noformat}
> /**
>  * Allows partition placement to subset of cluster node.
>  *
>  * Backup nodes also will be assigned from the subset.
>  */
> public interface AffinityPrimaryFilter extends IgniteBiClosure<Integer, List<ClusterNode>, List<ClusterNode>> {
>     /**
>      * Return nodes allowed to contain given partition.
>      * @param partition Partition.
>      * @param currentTopologyNodes All nodes from current topology.
>      * @return Subset of nodes.
>      */
>     @Override public List<ClusterNode> apply(Integer partition, List<ClusterNode> currentTopologyNodes);
> }
> {noformat}



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