org.apache.ignite.cache.affinity

Interface AffinityFunctionContext

public interface AffinityFunctionContext

Affinity function context. This context is passed to AffinityFunction for partition reassignment on every topology change event.

Method Summary

Modifier and Type	Method and Description
int	backups() Gets number of backups for new assignment.
List<ClusterNode>	currentTopologySnapshot() Gets current topology snapshot.
org.apache.ignite.internal.processors.affinity.AffinityTopologyVersion	currentTopologyVersion() Gets current topology version number.
@Nullable DiscoveryEvent	discoveryEvent() Gets discovery event caused topology change.
@Nullable List<ClusterNode>	previousAssignment(int part) Gets affinity assignment for given partition on previous topology version.

Method Detail

previousAssignment

@Nullable
@Nullable List<ClusterNode> previousAssignment(int part)

Gets affinity assignment for given partition on previous topology version. First node in returned list is a primary node, other nodes are backups.

Parameters:

part - Partition to get previous assignment for.

Returns:

List of nodes assigned to given partition on previous topology version or null if this information is not available.

backups

int backups()

Gets number of backups for new assignment.

Returns:

Number of backups for new assignment.

currentTopologySnapshot

List<ClusterNode> currentTopologySnapshot()

Gets current topology snapshot. Snapshot will contain only nodes on which particular cache is configured. List of passed nodes is guaranteed to be sorted in a same order on all nodes on which partition assignment is performed.

Returns:

Cache topology snapshot.

currentTopologyVersion

org.apache.ignite.internal.processors.affinity.AffinityTopologyVersion currentTopologyVersion()

Gets current topology version number.

Returns:

Current topology version number.

discoveryEvent

@Nullable
@Nullable DiscoveryEvent discoveryEvent()

Gets discovery event caused topology change.

Returns:

Discovery event caused latest topology change or null if this information is not available.