org.apache.pulsar.common.policies.impl.MinAvailablePolicy 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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.pulsar.common.policies.impl;
import java.util.SortedSet;
import lombok.AllArgsConstructor;
import lombok.Data;
import org.apache.pulsar.common.policies.AutoFailoverPolicy;
import org.apache.pulsar.common.policies.data.AutoFailoverPolicyData;
import org.apache.pulsar.common.policies.data.AutoFailoverPolicyType;
import org.apache.pulsar.common.policies.data.BrokerStatus;
/**
* Implementation of min available policy.
*/
@Data
@AllArgsConstructor
public class MinAvailablePolicy extends AutoFailoverPolicy {
private static final String MIN_LIMIT_KEY = "min_limit";
private static final String USAGE_THRESHOLD_KEY = "usage_threshold";
private static final int MAX_USAGE_THRESHOLD = 100;
@SuppressWarnings("checkstyle:MemberName")
public int min_limit;
@SuppressWarnings("checkstyle:MemberName")
public int usage_threshold;
public MinAvailablePolicy(AutoFailoverPolicyData policyData) {
if (!policyData.getPolicyType().equals(AutoFailoverPolicyType.min_available)) {
throw new IllegalArgumentException();
}
if (!policyData.getParameters().containsKey(MIN_LIMIT_KEY)) {
throw new IllegalArgumentException();
}
if (!policyData.getParameters().containsKey(USAGE_THRESHOLD_KEY)) {
throw new IllegalArgumentException();
}
this.min_limit = Integer.parseInt(policyData.getParameters().get(MIN_LIMIT_KEY));
this.usage_threshold = Integer.parseInt(policyData.getParameters().get(USAGE_THRESHOLD_KEY));
}
@Override
public boolean isBrokerAvailable(BrokerStatus brokerStatus) {
return brokerStatus.isActive()
&& (usage_threshold == MAX_USAGE_THRESHOLD || brokerStatus.getLoadFactor() < usage_threshold);
}
@Override
public boolean shouldFailoverToSecondary(SortedSet primaryCandidates) {
int numAvailablePrimaryBrokers = 0;
for (BrokerStatus brkStatus : primaryCandidates) {
if (isBrokerAvailable(brkStatus)) {
numAvailablePrimaryBrokers++;
}
}
return numAvailablePrimaryBrokers < this.min_limit;
}
@Override
public boolean shouldFailoverToSecondary(int totalPrimaryCandidates) {
return totalPrimaryCandidates < this.min_limit;
}
}