State _ between the JVMs in a MapReduce job

To create a MapReduce job, what should be coded first?

To connect Hadoop to AWS S3, which client should you use?

HBase works with which type of schema enforcement?

HDFS file are of what type?

A distributed cache file path can originate from what location?

Which are the advantages of the disk-level encryption in HDFS?

Which command is used for setting an environment variable in a streaming command?

Which two parameters of the Hadoop streaming command are optional?

Which statements is correct about YARN's Web Application Proxy?

Which two of the following are the correct differences between MapReduce and traditional RDBMS?