What is configuration of a typical slave node on Hadoop cluster? How many JVMs run on a slave node?

• Single instance of a Task Tracker is run on each Slave node. Task tracker is run as a separate JVM process.
• Single instance of a DataNode daemon is run on each Slave node. DataNode daemon is run as a separate JVM process.
• One or Multiple instances of Task Instance is run on each slave node. Each task instance is run as a separate JVM process. The number of Task instances can be controlled by configuration. Typically a high end machine is configured to run more task instances.