Examples of org.apache.hadoop.metrics2.MetricsTag

org.apache.hadoop.metrics2.lib.MetricMutableCounterLong
Immutable tag for metrics (for grouping on host/queue/username etc.)

    return sink;
  }


  synchronized void registerSink(String name, String desc, MetricsSink sink) {
    checkNotNull(config, "config");
    MetricsConfig conf = sinkConfigs.get(name);
    MetricsSinkAdapter sa = conf != null
        ? newSink(name, desc, sink, conf)
        : newSink(name, desc, sink, config.subset(SINK_KEY));
    sinks.put(name, sa);
    sa.start();

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  private synchronized void configureSinks() {
    sinkConfigs = config.getInstanceConfigs(SINK_KEY);
    int confPeriod = 0;
    for (Entry<String, MetricsConfig> entry : sinkConfigs.entrySet()) {
      MetricsConfig conf = entry.getValue();
      int sinkPeriod = conf.getInt(PERIOD_KEY, PERIOD_DEFAULT);
      confPeriod = confPeriod == 0 ? sinkPeriod
                                   : ArithmeticUtils.gcd(confPeriod, sinkPeriod);
      String clsName = conf.getClassName("");
      if (clsName == null) continue;  // sink can be registered later on
      String sinkName = entry.getKey();
      try {
        MetricsSinkAdapter sa = newSink(sinkName,
            conf.getString(DESC_KEY, sinkName), conf);
        sa.start();
        sinks.put(sinkName, sa);
      }
      catch (Exception e) {
        LOG.warn("Error creating sink '"+ sinkName +"'", e);

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    }
    return "localhost";
  }


  private void registerSystemSource() {
    MetricsConfig sysConf = sourceConfigs.get(MS_NAME);
    sysSource = new MetricsSourceAdapter(prefix, MS_STATS_NAME, MS_STATS_DESC,
        MetricsAnnotations.makeSource(this), injectedTags, period,
        sysConf == null ? config.subset(SOURCE_KEY) : sysConf);
    sysSource.start();
  }

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   * @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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