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Posted to issues@ignite.apache.org by "Alexei Scherbakov (JIRA)" <ji...@apache.org> on 2016/12/08 20:46:58 UTC
[jira] [Commented] (IGNITE-4378) Affinity function should support
assigning partition to subset of cluster nodes
[ https://issues.apache.org/jira/browse/IGNITE-4378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15733353#comment-15733353 ]
Alexei Scherbakov commented on IGNITE-4378:
-------------------------------------------
Did POC implementation for rather complex assigmnent based on {{RendezvousAffinityFunction }}, solution seems viable.
But performance is not OK. Will continue working on it.
> 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: 2.0
>
>
> 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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