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.
Apache Kylinâ¢ Overview. Apache Kylinâ¢ is an open source Distributed Analytics Engine designed to provide SQL interface and multi-dimensional analysis (OLAP) on Hadoop supporting extremely large datasets, original contributed from eBay Inc. Apache Kylinâ¢ lets you query massive data set at sub-second latency in 3 steps. 1  Identify a Star Schema data on Hadoop. 2  Build Cube on Hadoop.  Query data with ANSI-SQL and get results in sub-second, via ODBC, JDBC or RESTful API.