org.apache.apex.malhar.stream.api

Interface WindowedStream<T>

Type Parameters:

T - Output tuple type

All Superinterfaces:

ApexStream<T>

public interface WindowedStream<T>
extends ApexStream<T>

A stream with windowed transformation

Transformation types:

• Combine
• Group
• Keyed Combine
• Keyed Group
• Join
• CoGroup

Features supported with windowed transformation

• Watermark - Ingestion time watermark / logical tuple watermark
• Early Triggers - How frequent to emit real-time partial result
• Late Triggers - When to emit updated result with tuple comes after watermark
• Customizable Trigger Behaviour - What to do when fires a trigger
• Spool window state - In-Memory window state can be spooled to disk if it is full
• 3 different accumulation models: ignore, accumulation, accumulation + delta
• Window support: Non-Mergeable window(fix window, sliding window), Mergeable window(session window) base on 3 different tuple time
• Different tuple time support: event time, system time, ingestion time

Since:

3.4.0

Method Summary

Methods inherited from interface org.apache.apex.malhar.stream.api.ApexStream

addOperator, addOperator, count, countByKey, countByKey, createDag, filter, filter, flatMap, flatMap, fold, fold, map, map, populateDag, print, printErr, reduce, reduce, run, runEmbedded, setGlobalAttribute, union, with, with, with