For running hadoop service daemons in Hadoop in secure mode . . . . . . . . principals are required.

A. Store intermediate data B. Cache files for tasks C. Manage computation resources D. Execute MapReduce jobs

A. Track the progress of MapReduce jobs B. Manage computation resources C. Execute MapReduce jobs D. Manage Hadoop ecosystem tools

A. Represents a chunk of input data B. Combine intermediate key-value pairs on the mapper side C. Aggregate values on the reducer side D. Convert data into a binary format

A. Combine intermediate key-value pairs on the mapper side B. Aggregate values on the reducer side C. Sort and shuffle data D. Distribute data to reducers