https://hadoop.apache.org/docs/r1.2.1/api/org/apache/hadoop/metrics/util/MetricsRegistry.html
MetricsRegistry (Hadoop 1.2.1 API)
hadoopapi
https://hadoop.apache.org/docs/r1.2.1/api/org/apache/hadoop/metrics2/lib/MetricsRegistry.html
MetricsRegistry (Hadoop 1.2.1 API)
hadoopapi