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Category: CCA-500

Exam CCA-500: Cloudera Certified Administrator for Apache Hadoop (CCAH)

Which method should you tell that developers to implement?

You have recently converted your Hadoop cluster from a MapReduce 1 (MRv1) architecture to
MapReduce 2 (MRv2) on YARN architecture. Your developers are accustomed to specifying map
and reduce tasks (resource allocation) tasks when they run jobs: A developer wants to know how
specify to reduce tasks when a specific job runs. Which method should you tell that developers to
implement?

Which two best describes how FIFO Scheduler arbitrates the cluster resources for job and its tasks?

You have a cluster running with a FIFO scheduler enabled. You submit a large job A to the cluster,
which you expect to run for one hour. Then, you submit job B to the cluster, which you expect to
run a couple of minutes only.
You submit both jobs with the same priority.
Which two best describes how FIFO Scheduler arbitrates the cluster resources for job and its
tasks?

What is the cause of the error?

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?

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

Your cluster’s mapred-start.xml includes the following parameters
<name>mapreduce.map.memory.mb</name>
<value>4096</value>
<name>mapreduce.reduce.memory.mb</name>
<value>8192</value>
And any cluster’s yarn-site.xml includes the following parameters
<name>yarn.nodemanager.vmen-pmen-ration</name>
<value>2.1</value>
What is the maximum amount of virtual memory allocated for each map task before YARN will kill
its Container?


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