Stream Processing: Hands\hyp{}on with Apache Flink

Get onboard this journey into the land of streams. This is a complete hands-on book about Apache Flink, that follows rea

235 62 16MB

English Pages 234 Year 2023

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$Stream Processing: Hands\hyp{}on with Apache Flink$

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Giannis Polyzos

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Computers
Programming

Table of contents :
Stream Processing: Hands\hyp{}on with Apache Flink
Stream Processing: Hands\hyp{}on with Apache Flink
Introduction
In the land of streams
The Streaming Layer: Redpanda
Flink’s Runtime
Summary
Streams and Tables
Streaming SQL Semantics
Flink SQL Logical Components
Running SQL Queries
Operators
The TableEnvironment
Summary
Watermarks & Windows
The Notion of Time
Time Windows
What is a Watermark?
How do watermarks work?
Watermark Generation
Watermark Propagation
Idle Sources
Summary
Streaming Joins
Introduction
Regular Joins
Interval Joins
Temporal Joins
Lookup Joins
Summary
User Defined Functions
Scalar Functions
Table Functions
Aggregate & Table Aggregate Functions
External Service Lookup UDF
Summary
The Datastream API
Sources
Datastream Operators
Merging Multiple Streams
Event Buffering & Enrichment
Handling Late Arriving Data
Summary
Fault Tolerance
Why the need for checkpoints?
Failure in Practise
Flink’s Checkpointing Algorithm
Aligned and Unaligned Checkpoints
Checkpoints vs. Savepoints
Summary
State Backends
State Backends
Using RocksDB
Inspecting RocksDB
Tuning and Troubleshooting
Summary
Monitoring and Troubleshooting
Metrics System
Prometheus and Grafana Setup
Setting up Flink Dashboards
Troubleshooting tips
Summary

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