Examples of org.apache.hadoop.metrics2.MetricsException

org.apache.hadoop.metrics2.MetricsException
A general metrics exception wrapper

  }


  private<T> T returnExistingWithCast(MetricMutable metric,
                                      Class<T> metricClass, String name) {
    if (!metricClass.isAssignableFrom(metric.getClass())) {
      throw new MetricsException("Metric already exists in registry for metric name: " +
              name + " and not of type " + metricClass);
    }


    return (T) metric;
  }

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    currentServiceName = getFirstConfigPrefix(conf);


    databaseUrl = conf.getString(DATABASE_URL_KEY);


    if (databaseUrl == null)
      throw new MetricsException(
          "databaseUrl required in the metrics2 configuration for SqlServerSink.");


    try {
      Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
    } catch (ClassNotFoundException cnfe) {
      throw new MetricsException(
          "SqlServerSink requires the Microsoft JDBC driver for SQL Server.");
    }


    hadoopConfig = new org.apache.hadoop.conf.Configuration();
    if (hadoopConfig != null) {

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      }
      else if (m instanceof MetricMutableCounter<?>) {
        ((MetricMutableCounter<?>) m).incr();
      }
      else {
        throw new MetricsException("Unsupported incr() for metric "+ name);
      }
    }
    else if (factory != null) {
      metricsMap.put(name, factory.newMetric(name));
      incr(name, null);
    }
    else {
      throw new MetricsException("Metric "+ name +" doesn't exist");
    }
  }

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    if (m != null) {
      if (m instanceof MetricMutableGauge<?>) {
        ((MetricMutableGauge<?>) m).decr();
      }
      else {
        throw new MetricsException("Unsupported decr() for metric "+ name);
      }
    }
    else if (factory != null) {
      metricsMap.put(name, factory.newMetric(name));
      decr(name, null);
    }
    else {
      throw new MetricsException("Metric "+ name +" doesn't exist");
    }
  }

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    if (m != null) {
      if (m instanceof MetricMutableStat) {
        ((MetricMutableStat) m).add(value);
      }
      else {
        throw new MetricsException("Unsupported add(value) for metric "+ name);
      }
    }
    else if (factory != null) {
      metricsMap.put(name, factory.newStat(name));
      add(name, value, null);
    }
    else {
      throw new MetricsException("Metric "+ name +" doesn't exist");
    }
  }

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    return metricsMap.entrySet();
  }


  private void checkMetricName(String name) {
    if (metricsMap.containsKey(name)) {
      throw new MetricsException("Metric name "+ name +" already exists!");
    }
  }

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    }
  }


  private void checkTagName(String name) {
    if (tagsMap.containsKey(name)) {
      throw new MetricsException("Tag "+ name +" already exists!");
    }
  }

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            sb.setLength(sbBaseLen);
          }
        }
      }
    } catch (IOException io) {
      throw new MetricsException("Failed to putMetrics", io);
    }
  }

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  @Override
  public synchronized void start() {
    Contracts.checkNotNull(prefix, "prefix");
    if (monitoring) {
      LOG.warn(prefix +" metrics system already started!",
               new MetricsException("Illegal start"));
      return;
    }
    for (Callback cb : callbacks) cb.preStart();
    configure(prefix);
    startTimer();

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  @Override
  public synchronized void stop() {
    if (!monitoring) {
      LOG.warn(prefix +" metrics system not yet started!",
               new MetricsException("Illegal stop"));
      return;
    }
    for (Callback cb : callbacks) cb.preStop();
    LOG.info("Stopping "+ prefix +" metrics system...");
    stopTimer();

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