Github user jiajunwang commented on a diff in the pull request:

    https://github.com/apache/helix/pull/145#discussion_r174323138
  
    --- Diff: 
helix-core/src/main/java/org/apache/helix/api/rebalancer/constraint/dataprovider/CapacityProvider.java
 ---
    @@ -0,0 +1,38 @@
    +package org.apache.helix.api.rebalancer.constraint.dataprovider;
    +
    +/*
    + * 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.
    + */
    +
    +/**
    + * An interface for getting participant capacity information.
    + */
    +public interface CapacityProvider {
    +
    +  /**
    +   * @param participant
    +   * @return The total participant capacity.
    +   */
    +  int getParticipantCapacity(String participant);
    +
    +  /**
    +   * @param participant
    +   * @return The provisioned capacity.
    +   */
    +  int getParticipantProvisioned(String participant);
    --- End diff --
    
    Let's use getParticipantUsage()


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