| 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 the proposed assignment according to the top state replication count on the instance. |
| * The higher number the number of top state partitions assigned to the instance, the lower the |
| * score, vice versa. |
| */ |
| class ResourceTopStateAntiAffinityConstraint extends SoftConstraint { |
| private static final float MAX_SCORE = 1f; |
| private static final float MIN_SCORE = 0f; |
| |
| ResourceTopStateAntiAffinityConstraint() { |
| super(MAX_SCORE, MIN_SCORE); |
| } |
| |
| @Override |
| protected float getAssignmentScore(AssignableNode node, AssignableReplica replica, |
| ClusterContext clusterContext) { |
| if (!replica.isReplicaTopState()) { |
| return (getMaxScore() + getMinScore()) / 2.0f; |
| } |
| |
| int curTopPartitionCountForResource = node.getAssignedTopStatePartitionsCount(); |
| int doubleMaxTopStateCount = 2 * clusterContext.getEstimatedMaxTopStateCount(); |
| |
| return Math.max( |
| ((float) doubleMaxTopStateCount - curTopPartitionCountForResource) / doubleMaxTopStateCount, |
| 0); |
| } |
| } |