| /* |
| * 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. |
| */ |
| |
| package org.apache.solr.util.circuitbreaker; |
| |
| import java.lang.invoke.MethodHandles; |
| import java.lang.management.ManagementFactory; |
| import java.lang.management.OperatingSystemMXBean; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * <p> |
| * Tracks current CPU usage and triggers if the specified threshold is breached. |
| * |
| * This circuit breaker gets the average CPU load over the last minute and uses |
| * that data to take a decision. We depend on OperatingSystemMXBean which does |
| * not allow a configurable interval of collection of data. |
| * //TODO: Use Codahale Meter to calculate the value locally. |
| * </p> |
| * |
| * <p> |
| * The configuration to define which mode to use and the trigger threshold are defined in |
| * solrconfig.xml |
| * </p> |
| */ |
| public class CPUCircuitBreaker extends CircuitBreaker { |
| private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass()); |
| private static final OperatingSystemMXBean operatingSystemMXBean = ManagementFactory.getOperatingSystemMXBean(); |
| |
| private final boolean enabled; |
| private final double cpuUsageThreshold; |
| |
| // Assumption -- the value of these parameters will be set correctly before invoking getDebugInfo() |
| private static final ThreadLocal<Double> seenCPUUsage = ThreadLocal.withInitial(() -> 0.0); |
| |
| private static final ThreadLocal<Double> allowedCPUUsage = ThreadLocal.withInitial(() -> 0.0); |
| |
| public CPUCircuitBreaker(CircuitBreakerConfig config) { |
| super(config); |
| |
| this.enabled = config.getCpuCBEnabled(); |
| this.cpuUsageThreshold = config.getCpuCBThreshold(); |
| } |
| |
| @Override |
| public boolean isTripped() { |
| if (!isEnabled()) { |
| return false; |
| } |
| |
| if (!enabled) { |
| return false; |
| } |
| |
| double localAllowedCPUUsage = getCpuUsageThreshold(); |
| double localSeenCPUUsage = calculateLiveCPUUsage(); |
| |
| if (localSeenCPUUsage < 0) { |
| if (log.isWarnEnabled()) { |
| String msg = "Unable to get CPU usage"; |
| |
| log.warn(msg); |
| } |
| |
| return false; |
| } |
| |
| allowedCPUUsage.set(localAllowedCPUUsage); |
| |
| seenCPUUsage.set(localSeenCPUUsage); |
| |
| return (localSeenCPUUsage >= localAllowedCPUUsage); |
| } |
| |
| @Override |
| public String getDebugInfo() { |
| |
| if (seenCPUUsage.get() == 0.0 || seenCPUUsage.get() == 0.0) { |
| log.warn("CPUCircuitBreaker's monitored values (seenCPUUSage, allowedCPUUsage) not set"); |
| } |
| |
| return "seenCPUUSage=" + seenCPUUsage.get() + " allowedCPUUsage=" + allowedCPUUsage.get(); |
| } |
| |
| @Override |
| public String getErrorMessage() { |
| return "CPU Circuit Breaker triggered as seen CPU usage is above allowed threshold." + |
| "Seen CPU usage " + seenCPUUsage.get() + " and allocated threshold " + |
| allowedCPUUsage.get(); |
| } |
| |
| public double getCpuUsageThreshold() { |
| return cpuUsageThreshold; |
| } |
| |
| protected double calculateLiveCPUUsage() { |
| return operatingSystemMXBean.getSystemLoadAverage(); |
| } |
| } |