Flink – Interactive Scala Shell Interactive scala shell is available in Flink download package. It allows us to run flink streams and batch processing statements in scala by building and executing the jobs directly created from the shell. We can simply call execute() method, which should request to run the job. The shell supports including… Continue reading »
Apache Flink – mapWithState on KeyedStream mapWithState operator provides a syntactic ease for keeping ValueState for map operations on KeyedStreams in Apache Flink. It is specially useful for doing a running count on the data. That is exactly what we are going to try in this post. Just remember that you don’t have to return… Continue reading »
Apache Flink – Collections & Streams While developing a streaming application, it is often necessary to use some inputs as collections. This can be specially useful for testing purposes. In this post we are trying to discuss how we can create a DataStream from a collection. After applying some operators on the stream, we are… Continue reading »
![Apache Flink – Class Not found [org/apache/flink/streaming/api/scala/DataStream]](http://www.alternatestack.com/wp-content/uploads/2018/09/Screen-Shot-2018-09-16-at-5.29.04-PM-200x140.png)
Apache Flink – Class Not found [org/apache/flink/streaming/api/scala/DataStream] If you are developing a Flink app following examples on the web, you can most likely encounter the following error: Generally, the problem is resolved by correctly setting the source folder in a scala project in IntelliJ but the weird thing is that it is happening for a… Continue reading »
Installing Confluent Platform on Mac OS There are no direct download instructions available on the confluent platform yet to install the packages on Mac OS. I just want to share it with others just in case someone might need some help with this. Download the Archive The zip packages can be downloaded from here: Download…. Continue reading »