Package org.apache.samza.metrics

Interface Summary

Interface	Description
Metric	Metric class that allows metric visitors to visit it to get its information.
MetricsAccessor	A MetricsAccessor allows users to retrieve metric values, based on group name and metric name, though specific metrics system, such as JMX.
MetricsRegistry	A MetricsRegistry allows its users to create new Metrics and have those metrics wired to specific metrics systems, such as JMX, provided by MetricsReporters.
MetricsReporter	A MetricsReporter is the interface that different metrics sinks, such as JMX, implement to receive metrics from the Samza framework and Samza jobs.
MetricsReporterFactory	Build a MetricsReporter
MetricsValidator	A MetricsValidator reads the job's metrics values by using the MetricsAccessor, and validate them.
ReadableMetricsRegistry	A ReadableMetricsRegistry is a MetricsRegistry that also allows read access to the metrics for which it is responsible.
ReadableMetricsRegistryListener
Reservoir	A reservoir interface to store, update and display values

Class Summary

Class	Description
Counter	A counter is a Metric that represents a cumulative value.
Gauge<T>	A Gauge is a Metric that wraps some instance of T in a thread-safe reference and allows it to be set or retrieved.
MetricsRegistryWithSource	Simple holder for ReadableMetricsRegistry and its source, used for implementations of MetricsReporter.
MetricsVisitor	A MetricsVisitor can be used to process each metric in a ReadableMetricsRegistry, encapsulating the logic of what to be done with each metric in the counter and gauge methods.
SamzaHistogram	Creates a Histogram metric using ExponentiallyDecayingReservoir Keeps a Gauge for each percentile
SlidingTimeWindowReservoir	An implemented Reservoir used to store values that appear in a sliding time window
Snapshot	A statistical snapshot of a collection of values
Timer	A timer metric that stores time duration and provides Snapshot of the durations.

Exception Summary

Exception	Description
MetricsValidationFailureException	Thrown when the metrics validation fails.