hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/DumpRegionServerMetrics.java

   1 /*
   2  * Licensed to the Apache Software Foundation (ASF) under one or more
   3  * contributor license agreements.  See the NOTICE file distributed with
   4  * this work for additional information regarding copyright ownership.
   5  * The ASF licenses this file to You under the Apache License, Version 2.0
   6  * (the "License"); you may not use this file except in compliance with
   7  * the License.  You may obtain a copy of the License at
   8  *
   9  *      http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17 package org.apache.hadoop.hbase.regionserver;
  18
  19 import java.io.IOException;
  20 import java.io.PrintWriter;
  21 import java.io.StringWriter;
  22 import java.lang.management.ManagementFactory;
  23 import javax.management.MBeanServer;
  24 import javax.management.MalformedObjectNameException;
  25 import javax.management.ObjectName;
  26 import org.apache.hadoop.hbase.util.JSONBean;
  27 import org.apache.yetus.audience.InterfaceAudience;
  28
  29 /**
  30  * Utility for doing JSON and MBeans.
  31  */
  32 @InterfaceAudience.Private
  33 public final class DumpRegionServerMetrics {
  34   /**
  35    * Dump out a subset of regionserver mbeans only, not all of them, as json on System.out.
  36    */
  37   public static String dumpMetrics() throws MalformedObjectNameException, IOException {
  38     StringWriter sw = new StringWriter(1024 * 100); // Guess this size
  39     try (PrintWriter writer = new PrintWriter(sw)) {
  40       JSONBean dumper = new JSONBean();
  41       try (JSONBean.Writer jsonBeanWriter = dumper.open(writer)) {
  42         MBeanServer mbeanServer = ManagementFactory.getPlatformMBeanServer();
  43         jsonBeanWriter.write(mbeanServer,
  44           new ObjectName("java.lang:type=Memory"), null, false);
  45         jsonBeanWriter.write(mbeanServer,
  46           new ObjectName("Hadoop:service=HBase,name=RegionServer,sub=IPC"), null, false);
  47         jsonBeanWriter.write(mbeanServer,
  48           new ObjectName("Hadoop:service=HBase,name=RegionServer,sub=Replication"), null, false);
  49         jsonBeanWriter.write(mbeanServer,
  50           new ObjectName("Hadoop:service=HBase,name=RegionServer,sub=Server"), null, false);
  51       }
  52     }
  53     sw.close();
  54     return sw.toString();
  55   }
  56
  57   public static void main(String[] args) throws IOException, MalformedObjectNameException {
  58     String str = dumpMetrics();
  59     System.out.println(str);
  60   }
  61
  62   private DumpRegionServerMetrics() {}
  63 }