org.apache.rocketmq.broker.coldctr.PIDAdaptiveColdCtrStrategy Maven / Gradle / Ivy
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* 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,
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* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.rocketmq.broker.coldctr;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public class PIDAdaptiveColdCtrStrategy implements ColdCtrStrategy {
/**
* Stores the maximum number of recent et val
*/
private static final int MAX_STORE_NUMS = 10;
/**
* The weights of the three modules of the PID formula
*/
private static final Double KP = 0.5, KI = 0.3, KD = 0.2;
private final List historyEtValList = new ArrayList<>();
private final ColdDataCgCtrService coldDataCgCtrService;
private final Long expectGlobalVal;
private long et = 0L;
public PIDAdaptiveColdCtrStrategy(ColdDataCgCtrService coldDataCgCtrService, Long expectGlobalVal) {
this.coldDataCgCtrService = coldDataCgCtrService;
this.expectGlobalVal = expectGlobalVal;
}
@Override
public Double decisionFactor() {
if (historyEtValList.size() < MAX_STORE_NUMS) {
return 0.0;
}
Long et1 = historyEtValList.get(historyEtValList.size() - 1);
Long et2 = historyEtValList.get(historyEtValList.size() - 2);
Long differential = et1 - et2;
Double integration = 0.0;
for (Long item: historyEtValList) {
integration += item;
}
return KP * et + KI * integration + KD * differential;
}
@Override
public void promote(String consumerGroup, Long currentThreshold) {
if (decisionFactor() > 0) {
coldDataCgCtrService.addOrUpdateGroupConfig(consumerGroup, (long)(currentThreshold * 1.5));
}
}
@Override
public void decelerate(String consumerGroup, Long currentThreshold) {
if (decisionFactor() < 0) {
long changedThresholdVal = (long)(currentThreshold * 0.8);
if (changedThresholdVal < coldDataCgCtrService.getBrokerConfig().getCgColdReadThreshold()) {
changedThresholdVal = coldDataCgCtrService.getBrokerConfig().getCgColdReadThreshold();
}
coldDataCgCtrService.addOrUpdateGroupConfig(consumerGroup, changedThresholdVal);
}
}
@Override
public void collect(Long globalAcc) {
et = expectGlobalVal - globalAcc;
historyEtValList.add(et);
Iterator iterator = historyEtValList.iterator();
while (historyEtValList.size() > MAX_STORE_NUMS && iterator.hasNext()) {
iterator.next();
iterator.remove();
}
}
}