Hortonworks HDPCD Exam With Confidence Using Practice Dumps

Two namespaces: an active namespace and a backup namespace

A single namespace

An arbitrary number of namespaces

No namespaces

When the types of the reduce operation’s input key and input value match the types of the reducer’s output key and output value and when the reduce operation is both communicative and associative.

When the signature of the reduce method matches the signature of the combine method.

Always. Code can be reused in Java since it is a polymorphic object-oriented programming language.

Always. The point of a combiner is to serve as a mini-reducer directly after the map phase to increase performance.

Never. Combiners and reducers must be implemented separately because they serve different purposes.

As many final key-value pairs as desired. There are no restrictions on the types of those key-value pairs (i.e., they can be heterogeneous).

As many final key-value pairs as desired, but they must have the same type as the intermediate key-value pairs.

As many final key-value pairs as desired, as long as all the keys have the same type and all the values have the same type.

One final key-value pair per value associated with the key; no restrictions on the type.

One final key-value pair per key; no restrictions on the type.