SimpleLoadCalculatorImpl.java

/**
 * Copyright 2016 Yahoo Inc.
 *
 * Licensed 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.
 */
package com.yahoo.pulsar.broker.loadbalance.impl;

import java.util.Map;

import com.google.common.collect.Maps;
import com.yahoo.pulsar.broker.loadbalance.LoadCalculator;
import com.yahoo.pulsar.broker.loadbalance.LoadReport;
import com.yahoo.pulsar.broker.loadbalance.ResourceDescription;
import com.yahoo.pulsar.broker.loadbalance.ServiceRequest;

public class SimpleLoadCalculatorImpl implements LoadCalculator {

    private final Map<String, Map<String, Integer>> resourceUsageCalibers = Maps.newHashMap();

    @Override
    public ResourceDescription getResourceDescription(ServiceRequest srvRequest) {
        return null;
    }

    @Override
    public void recaliberateResourceUsagePerServiceUnit(LoadReport loadReport) {
        // Based on each load report, calculate the average resource required by each service request characteristics
        // i.e. from the load report, we calculate that # of destinations and # of consumers are related to memory
        // usage, # of msg/s is counted toward NIC inbw and outbw and CPU, # of connections are related to the # of
        // threads, etc.
        // For example, based on the the current usage number of CPU on the broker and the total # of msg/s in all
        // ServiceUnit reports, we can estimate that 1 msg/s is corresponding to 0.5% CPU at average.
        // Hence, the resourceUsageCalibers will need to record that per 1 ServiceUnit feature of "msgInRate", the
        // calibrated resource cost is:
        // "msgInRate" => { "CPU": 0.5, "NIC-inbw": 200 }
    }

}