Examples of org.apache.hadoop.util.JvmPauseMonitor$Monitor

org.apache.hadoop.util.JvmPauseMonitor
Class which sets up a simple thread which runs in a loop sleeping for a short interval of time. If the sleep takes significantly longer than its target time, it implies that the JVM or host machine has paused processing, which may cause other problems. If such a pause is detected, the thread logs a message.

import static org.apache.hadoop.metrics2.impl.MsInfo.*;


public class TestJvmMetrics {


  @Test public void testPresence() {
    JvmPauseMonitor pauseMonitor = new JvmPauseMonitor(new Configuration());
    JvmMetrics jvmMetrics = new JvmMetrics("test", "test");
    jvmMetrics.setPauseMonitor(pauseMonitor);
    MetricsRecordBuilder rb = getMetrics(jvmMetrics);
    MetricsCollector mc = rb.parent();

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    if (NamenodeRole.NAMENODE == role) {
      httpServer.setNameNodeAddress(getNameNodeAddress());
      httpServer.setFSImage(getFSImage());
    }
    
    pauseMonitor = new JvmPauseMonitor(conf);
    pauseMonitor.start();
    metrics.getJvmMetrics().setPauseMonitor(pauseMonitor);
    
    startCommonServices(conf);
  }

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    // global DN settings
    registerMXBean();
    initDataXceiver(conf);
    startInfoServer(conf);
    pauseMonitor = new JvmPauseMonitor(conf);
    pauseMonitor.start();
  
    // BlockPoolTokenSecretManager is required to create ipc server.
    this.blockPoolTokenSecretManager = new BlockPoolTokenSecretManager();
    initIpcServer(conf);

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    if (NamenodeRole.NAMENODE == role) {
      httpServer.setNameNodeAddress(getNameNodeAddress());
      httpServer.setFSImage(getFSImage());
    }
    
    pauseMonitor = new JvmPauseMonitor(conf);
    pauseMonitor.start();


    startCommonServices(conf);
  }

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    if (NamenodeRole.NAMENODE == role) {
      httpServer.setNameNodeAddress(getNameNodeAddress());
      httpServer.setFSImage(getFSImage());
    }
    
    pauseMonitor = new JvmPauseMonitor(conf);
    pauseMonitor.start();


    startCommonServices(conf);
  }

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    if (NamenodeRole.NAMENODE == role) {
      httpServer.setNameNodeAddress(getNameNodeAddress());
      httpServer.setFSImage(getFSImage());
    }
    
    pauseMonitor = new JvmPauseMonitor(conf);
    pauseMonitor.start();


    startCommonServices(conf);
  }

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