Package org.apache.beam.runners.spark.metrics

Provides internal utilities for implementing Beam metrics using Spark accumulators.

Class Summary

Class	Description
MetricsAccumulator	For resilience, Accumulators are required to be wrapped in a Singleton.
MetricsAccumulator.AccumulatorCheckpointingSparkListener	Spark Listener which checkpoints MetricsContainerStepMap values for fault-tolerance.
MetricsContainerStepMapAccumulator	AccumulatorV2 implementation for MetricsContainerStepMap.
SparkBeamMetricSource	A Spark Source that is tailored to expose a SparkBeamMetric, wrapping an underlying MetricResults instance.
WithMetricsSupport	A MetricRegistry decorator-like that supports AggregatorMetric and SparkBeamMetric as Gauges.