Rockwell hardness testing is an indentation testing method. The indenter is either a conical diamond (brale) or a hard steel ball. Different indenter ball diameters from 1/16 to 1/2 in. are used depending on the test scale. To start the test, the indenter is âsetâ into the sample at a prescribed minor load.
Apache Flink is an open source platform for scalable batch and stream data processing. Flink supports batch and streaming analytics, in one system. Analytical programs can be written in concise and elegant APIs in Java and Scala.
There are a multiple of ways to track the progress of a Flink program: 1  The JobManager (the master of the distributed system) starts a web interface to observe program execution. 2  In runs on port 8081 by default (configured in conf/flink-config.yml).