| package org.apache.helix.controller.rebalancer.waged.constraints; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| import org.apache.helix.controller.rebalancer.waged.model.AssignableNode; |
| import org.apache.helix.controller.rebalancer.waged.model.AssignableReplica; |
| import org.apache.helix.controller.rebalancer.waged.model.ClusterContext; |
| |
| /** |
| * Evaluate by instance's current partition count versus estimated max partition count |
| * Intuitively, Encourage the assignment if the instance's occupancy rate is below average; |
| * Discourage the assignment if the instance's occupancy rate is above average |
| * The normalized score will be within [0, 1] |
| */ |
| class InstancePartitionsCountConstraint extends UsageSoftConstraint { |
| |
| @Override |
| protected double getAssignmentScore(AssignableNode node, AssignableReplica replica, |
| ClusterContext clusterContext) { |
| int estimatedMaxPartitionCount = clusterContext.getEstimatedMaxPartitionCount(); |
| int currentPartitionCount = node.getAssignedReplicaCount(); |
| return computeUtilizationScore(estimatedMaxPartitionCount, currentPartitionCount); |
| } |
| } |
