org.apache.beam.runners.samza.metrics

Class SamzaMetricOpFactory

java.lang.Object

org.apache.beam.runners.samza.metrics.SamzaMetricOpFactory

public class SamzaMetricOpFactory
extends java.lang.Object

Factory class to create Op for default transform metric computation.

Each metric Op computes and emits default throughput, latency & watermark progress metric per transform for Beam Samza Runner. A metric Op can be either attached to Input PCollection or Output PCollection of a PTransform.

Each concrete metric OP is responsible for following metrics computation: 1. Throughput: Emit the number of elements processed in the PCollection 2. Watermark Progress: Emit the output watermark progress of the PCollection 3. Latency: Maintain the avg arrival time per watermark across elements it processes, compute & emit the latency

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SamzaMetricOpFactory.OpType

Constructor Summary

Constructors

Constructor and Description
SamzaMetricOpFactory()

Method Summary

Modifier and Type	Method and Description
static <T> @NonNull Op<T,T,java.lang.Void>	createMetricOp(@NonNull java.lang.String urn, @NonNull java.lang.String pValue, @NonNull java.lang.String transformName, @NonNull SamzaMetricOpFactory.OpType opType, @NonNull SamzaTransformMetricRegistry samzaTransformMetricRegistry) Create a Op for default transform metric computation.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SamzaMetricOpFactory

public SamzaMetricOpFactory()

Method Detail

createMetricOp

public static <T> @NonNull Op<T,T,java.lang.Void> createMetricOp(@NonNull java.lang.String urn,
                                                                 @NonNull java.lang.String pValue,
                                                                 @NonNull java.lang.String transformName,
                                                                 @NonNull SamzaMetricOpFactory.OpType opType,
                                                                 @NonNull SamzaTransformMetricRegistry samzaTransformMetricRegistry)

Create a Op for default transform metric computation.

Type Parameters:

T - type of the message

Parameters:

urn - URN of the PCollection metric Op is processing

pValue - name of the PCollection metric Op is processing

transformName - name of the PTransform for which metric Op is created

opType - type of the metric

samzaTransformMetricRegistry - metric registry

Returns:

a Op for default transform metric computation