Apache Helix
· Helix is a generic cluster management framework used for the automatic management of partitioned, replicated and
distributed resources hosted on a cluster of nodes.
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window helix-1.2.0.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.