Examples of org.apache.hadoop.metrics2.util.MetricSampleQuantiles

org.apache.hadoop.metrics2.lib.MetricMutableCounterLong
Implementation of the Cormode, Korn, Muthukrishnan, and Srivastava algorithm for streaming calculation of targeted high-percentile epsilon-approximate quantiles. This is a generalization of the earlier work by Greenwald and Khanna (GK), which essentially allows different error bounds on the targeted quantiles, which allows for far more efficient calculation of high-percentiles. See: Cormode, Korn, Muthukrishnan, and Srivastava "Effective Computation of Biased Quantiles over Data Streams" in ICDE 2005 Greenwald and Khanna, "Space-efficient online computation of quantile summaries" in SIGMOD 2001

   * @return a metric object
   */
  public MetricMutableGaugeLong getLongGauge(String gaugeName,
      long potentialStartingValue) {
    // Try and get the guage.
    MetricMutable metric = metricsMap.get(gaugeName);


    // If it's not there then try and put a new one in the storage.
    if (metric == null) {


      // Create the potential new gauge.

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   * @return a metric object
   */
  public MetricMutableCounterLong getLongCounter(String counterName,
      long potentialStartingValue) {
    // See getLongGauge for description on how this works.
    MetricMutable counter = metricsMap.get(counterName);
    if (counter == null) {
      MetricMutableCounterLong newCounter = mf.newCounter(counterName, "",
          potentialStartingValue);
      counter = metricsMap.putIfAbsent(counterName, newCounter);
      if (counter == null) {

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    return (MetricMutableCounterLong) counter;
  }


  public MetricMutableHistogram getHistogram(String histoName) {
    // See getLongGauge for description on how this works.
    MetricMutable histo = metricsMap.get(histoName);
    if (histo == null) {
      MetricMutableHistogram newHisto = new MetricMutableHistogram(histoName,
          "");
      histo = metricsMap.putIfAbsent(histoName, newHisto);
      if (histo == null) {

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    return (MetricMutableHistogram) histo;
  }


  public MetricMutableQuantiles getQuantile(String histoName) {
    // See getLongGauge for description on how this works.
    MetricMutable histo = metricsMap.get(histoName);
    if (histo == null) {
      MetricMutableQuantiles newHisto = new MetricMutableQuantiles(histoName,
          "");
      histo = metricsMap.putIfAbsent(histoName, newHisto);
      if (histo == null) {

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  private <T extends MetricMutable> T addNewMetricIfAbsent(String name, T ret,
      Class<T> metricClass) {
    // If the value we get back is null then the put was successful and we will
    // return that. Otherwise metric should contain the thing that was in
    // before the put could be completed.
    MetricMutable metric = metricsMap.putIfAbsent(name, ret);
    if (metric == null) {
      return ret;
    }


    return returnExistingWithCast(metric, metricClass, name);

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   * @param initValue of the metric
   * @return a new counter object
   */
  public MetricMutableCounterInt newCounter(String name, String description,
      int initValue) {
    MetricMutableCounterInt ret = mf.newCounter(name, description, initValue);
    return addNewMetricIfAbsent(name, ret, MetricMutableCounterInt.class);
  }

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   * 
   * @param key the name of the counter
   * @param delta the ammount to increment
   */
  public void incCounters(String key, long delta) {
    MetricMutableCounterLong counter = metricsRegistry.getLongCounter(key, 0l);
    counter.incr(delta);


  }

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   * @param initValue of the metric
   * @return a new counter object
   */
  public MetricMutableCounterLong newCounter(String name, String description,
      long initValue) {
    MetricMutableCounterLong ret = mf.newCounter(name, description, initValue);
    return addNewMetricIfAbsent(name, ret, MetricMutableCounterLong.class);
  }

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  public MetricMutableCounterLong getLongCounter(String counterName,
      long potentialStartingValue) {
    // See getLongGauge for description on how this works.
    MetricMutable counter = metricsMap.get(counterName);
    if (counter == null) {
      MetricMutableCounterLong newCounter = mf.newCounter(counterName, "",
          potentialStartingValue);
      counter = metricsMap.putIfAbsent(counterName, newCounter);
      if (counter == null) {
        return newCounter;
      }

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  @Test
  public void testIncCounters() throws Exception {
    String key = "testinccounter";
    bmsi.incCounters(key, 100);
    MetricMutableCounterLong c = (MetricMutableCounterLong) bmsi.metricsRegistry
        .get(key);
    assertEquals(key, c.name);
    bmsi.incCounters(key, 100);
    assertSame(c, bmsi.metricsRegistry.get(key));
  }

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