CCA-500 Cloudera Certified Administrator for Apache Hadoop (CCAH) Questions and Answers

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 the command:

Hadoop jar j.jar DriverClass /data/input/data/output

The error message returned includes the line:

PriviligedActionException as:training (auth:SIMPLE) cause:org.apache.hadoop.mapreduce.lib.input.invalidInputException:

Input path does not exist: file:/data/input

What is the cause of the error?

You want to node to only swap Hadoop daemon data from RAM to disk when absolutely necessary. What should you do?

Assuming you’re not running HDFS Federation, what is the maximum number of NameNode daemons you should run on your cluster in order to avoid a “split-brain” scenario with your NameNode when running HDFS High Availability (HA) using Quorum-based storage?

Your cluster’s mapred-start.xml includes the following parameters

mapreduce.map.memory.mb

4096

mapreduce.reduce.memory.mb

8192

And any cluster’s yarn-site.xml includes the following parameters

yarn.nodemanager.vmen-pmen-ration

2.1

What is the maximum amount of virtual memory allocated for each map task before YARN will kill its Container?

You are configuring a server running HDFS, MapReduce version 2 (MRv2) on YARN running Linux. How must you format underlying file system of each DataNode?

Which YARN daemon or service monitors a Controller’s per-application resource using (e.g., memory CPU)?