Flink KeyBy Network Calls: The Performance Bottleneck You Didn't See Coming

Basically in keyby() operator you need to define the construct based on which you define the key that will be used to create buckets by the windowing operator(). Flink 1. 8 has some promising improvements around this, namely continuous cleanup using incremental iteration or clean on compaction if rocksdb state backend is used. This second blog post in the series of network. You may not see any exceptions, but decreased throughput all the way to your sources. Youll also see backpressure in the flink ui.

It connects individual work units (subtasks) from. Apache flink performance optimization strategies. To make apache flink apps run better, you need to know how to tweak network buffers and set up the rocksdb backend. If you are not familiar with flink, you can read other introductory articles like this, this, and this one. But if you are already familiar with apache flink this article will help you to. For information about apache flink serializers, see data types & serialization in the apache flink documentation. Ensure that the business logic implemented by your operators isn't.