| /** |
| * 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.pulsar.zookeeper; |
| |
| import io.prometheus.client.Gauge; |
| |
| import org.apache.zookeeper.server.ServerCnxnFactory; |
| import org.apache.zookeeper.server.ZooKeeperServer; |
| import org.aspectj.lang.JoinPoint; |
| import org.aspectj.lang.annotation.After; |
| import org.aspectj.lang.annotation.Aspect; |
| import org.aspectj.lang.annotation.Pointcut; |
| |
| /** |
| * Instruments ZooKeeperServer to enable stats reporting on data set and z-node sizes |
| */ |
| @Aspect |
| public class ZooKeeperServerAspect { |
| private static boolean metricsRegistered = false; |
| |
| @Pointcut("execution(org.apache.zookeeper.server.ZooKeeperServer.new(..))") |
| public void zkServerConstructorPointCut() { |
| } |
| |
| @After("zkServerConstructorPointCut()") |
| public void zkServerConstructor(JoinPoint joinPoint) throws Throwable { |
| // ZooKeeperServer instance was created |
| ZooKeeperServer zkServer = (ZooKeeperServer) joinPoint.getThis(); |
| |
| synchronized (ZooKeeperServerAspect.class) { |
| if (metricsRegistered) { |
| // We can only register the metrics a single time for the process |
| return; |
| } |
| |
| metricsRegistered = true; |
| } |
| |
| Gauge.build().name("zookeeper_server_znode_count").help("Number of z-nodes stored").create() |
| .setChild(new Gauge.Child() { |
| @Override |
| public double get() { |
| return zkServer.getZKDatabase().getNodeCount(); |
| } |
| }).register(); |
| |
| Gauge.build().name("zookeeper_server_data_size_bytes").help("Size of all of z-nodes stored (bytes)").create() |
| .setChild(new Gauge.Child() { |
| @Override |
| public double get() { |
| return zkServer.getZKDatabase().getDataTree().approximateDataSize(); |
| } |
| }).register(); |
| |
| Gauge.build().name("zookeeper_server_connections").help("Number of currently opened connections").create() |
| .setChild(new Gauge.Child() { |
| @Override |
| public double get() { |
| ServerCnxnFactory cnxFactory = zkServer.getServerCnxnFactory(); |
| if (cnxFactory != null) { |
| return cnxFactory.getNumAliveConnections(); |
| } else { |
| return -1; |
| } |
| } |
| }).register(); |
| |
| Gauge.build().name("zookeeper_server_watches_count").help("Number of watches").create() |
| .setChild(new Gauge.Child() { |
| @Override |
| public double get() { |
| return zkServer.getZKDatabase().getDataTree().getWatchCount(); |
| } |
| }).register(); |
| |
| Gauge.build().name("zookeeper_server_ephemerals_count").help("Number of ephemerals z-nodes").create() |
| .setChild(new Gauge.Child() { |
| @Override |
| public double get() { |
| return zkServer.getZKDatabase().getDataTree().getEphemeralsCount(); |
| } |
| }).register(); |
| } |
| } |