org.corfudb.infrastructure.management

Interface ClusterAdvisor

All Known Implementing Classes:

CompleteGraphAdvisor

public interface ClusterAdvisor

ClusterAdvisor provides methods to decide the status of Corfu servers (failed or healed) in a given Layout and for a specific view of the cluster captured in a ClusterState. Decisions are dependant on the concrete underlying algorithm corresponding to a ClusterType. Created by Sam Behnam on 10/19/18.

Method Summary

Modifier and Type	Method and Description
Optional<NodeRank>	failedServer(ClusterState clusterState, List<String> unresponsiveServers) Provide a list of servers in the Corfu cluster which according to the underlying algorithm for ClusterType have failed.
ClusterGraph	getGraph(ClusterState clusterState) Provides a cluster graph generated from the ClusterState
ClusterType	getType() Get the corresponding ClusterType used in the current instance of ClusterAdvisor.
Optional<NodeRank>	healedServer(ClusterState clusterState, List<String> unresponsiveServers) Provide a server in the Corfu cluster which according to the underlying algorithm for ClusterType have healed.

Method Detail

getType

ClusterType getType()

Get the corresponding ClusterType used in the current instance of ClusterAdvisor. This strategy represents the characteristics of the underlying algorithm used for making a decision about the failed or healed status of Corfu servers.

Returns:

a concrete instance of ClusterType

failedServer

Optional<NodeRank> failedServer(ClusterState clusterState,
                                List<String> unresponsiveServers)

Provide a list of servers in the Corfu cluster which according to the underlying algorithm for ClusterType have failed. The decision is made based on the given view of the cluster captured in ClusterState along with the expected Layout.

Parameters:

clusterState - view of the Corfu server cluster from a client node's perspective.

unresponsiveServers - unresponsive servers in a layout.

Returns:

a node considered to have been failed according to the underlying ClusterType.

healedServer

Optional<NodeRank> healedServer(ClusterState clusterState,
                                List<String> unresponsiveServers)

Provide a server in the Corfu cluster which according to the underlying algorithm for ClusterType have healed. The decision is made based on the given view of the cluster captured in ClusterState along with the expected Layout.

Parameters:

clusterState - view of the Corfu server cluster from a client node's perspective.

unresponsiveServers - unresponsive servers in a layout.

Returns:

a server considered to have been healed according to the underlying ClusterType.

getGraph

ClusterGraph getGraph(ClusterState clusterState)

Provides a cluster graph generated from the ClusterState

Returns: