Your cluster is running MapReduce vserion 2 (MRv2) on YARN. Your ResourceManager is
configured to use the FairScheduler. Now you want to configure your scheduler such that a
new user on the cluster can submit jobs into their own queue application submission. Which
configuration should you set?

A user comes to you, complaining that when she attempts to submit a Hadoop job, it fails.
There is a directory in HDFS named /data/input. The Jar is named j.jar, and the driver class
is named DriverClass. She runs command: hadoop jar j.jar DriverClass
/data/input/data/output The error message returned includes the line:
PrivilegedActionException as:training (auth:SIMPLE)
cause.apache.hadoop.mapreduce.lib.input.InvalidInputException: Input path does not exits:
file :/data/input What is the cause of the error?

In CDH4 and later, which file contains a serialized form of all the directory and files inodes in
the filesystem, giving the NameNode a persistent checkpoint of the filesystem metadata?

Which process instantiates user code, and executes map and reduce tasks on a cluster
running MapReduce V2 (MRv2) on YARN?

You are migrating a cluster from MapReduce version 1 (MRv1) to MapReduce version2
(MRv2) on YARN. To want to maintain your MRv1 TaskTracker slot capacities when you
migrate. What should you do?