vcsomor opened a new pull request #3032:
URL: https://github.com/apache/hive/pull/3032


   Expose Compaction Observability delta metrics using the 
JsonFileMetricsReporter
   - Custom MapMetrics has been included into the MetricsRegistry.
   - The MetricsRegistry will call the listeners for the built-in metrics. 
Since the MapMetrics is not a built-in one it causing an IllegalArgument 
Exception. To avoid this exception to happen the HiveMetricsRegistry has been 
implemented.
   - A new Jackson JSON module has been added (MapCapableJsonMetricsModule) to 
add serialization of the `mbeans`
   - MapCapableJsonMetricsModule has been registered to the 
JsonFileMetricsReporter
   - AcidMetricsService now leveraging the on the nbew metrics instead of the 
MetricsMBeanImpl and JMX


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