What is the standard configuration of slave nodes in a Hadoop cluster?
Each slave node runs a JobTracker and a DataNode daemon.
Each slave node runs a TaskTracker and a DataNode daemon.
Each slave node either runs a TaskTracker or a DataNode daemon, but not both.
Each slave node runs a DataNode daemon, but only a fraction of the slave nodes run
Each slave node runs a TaskTracker, but only a fraction of the slave nodes run DataNode
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.
Reference:24 Interview Questions & Answers for Hadoop MapReduce developers,What is
configuration of a typical slave node on Hadoop cluster? How many JVMs run on a slave node?