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What is the standard configuration of slave nodes in a Hadoop cluster?

What is the standard configuration of slave nodes in a Hadoop cluster?

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A.
Each slave node runs a JobTracker and a DataNode daemon.

B.
Each slave node runs a TaskTracker and a DataNode daemon.

C.
Each slave node either runs a TaskTracker or a DataNode daemon, but not both.

D.
Each slave node runs a DataNode daemon, but only a fraction of the slave nodes run
TaskTrackers.

E.
Each slave node runs a TaskTracker, but only a fraction of the slave nodes run DataNode
daemons.

Explanation:
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?

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