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Guide for Cloudera Certified Administrator for Apache Hadoop (CCAH)

Quiz Cloudera Certified Administrator for Apache Hadoop (CCAH)

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/ 10

Quiz

1/10
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?
Select the answer
1 correct answer
A.
4 GB
B.
17.2 GB
C.
8.9 GB
D.
8.2 GB
E.
24.6 GB

Quiz

2/10
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?
Select the answer
1 correct answer
A.
Two active NameNodes and two Standby NameNodes
B.
One active NameNode and one Standby NameNode
C.
Two active NameNodes and on Standby NameNode
D.
Unlimited. HDFS High Availability (HA) is designed to overcome limitations on the number of
NameNodes you can deploy

Quiz

3/10
Table schemas in Hive are:
Select the answer
1 correct answer
A.
Stored as metadata on the NameNode
B.
Stored along with the data in HDFS
C.
Stored in the Metadata
D.
Stored in ZooKeeper

Quiz

4/10
For each YARN job, the Hadoop framework generates task log file. Where are Hadoop task log files
stored?
Select the answer
1 correct answer
A.
Cached by the NodeManager managing the job containers, then written to a log directory on the
NameNode
B.
Cached in the YARN container running the task, then copied into HDFS on job completion
C.
In HDFS, in the directory of the user who generates the job
D.
On the local disk of the slave mode running the task

Quiz

5/10
You have a cluster running with the fair Scheduler enabled. There are currently no jobs running on the
cluster, and you submit a job A, so that only job A is running on the cluster. A while later, you submit Job B.
now Job A and Job B are running on the cluster at the same time. How will the Fair Scheduler handle
these two jobs? (Choose two)
Select the answer
1 correct answer
A.
When Job B gets submitted, it will get assigned tasks, while job A continues to run with fewer tasks.
B.
When Job B gets submitted, Job A has to finish first, before job B can gets scheduled.
C.
When Job A gets submitted, it doesn’t consumes all the task slots.
D.
When Job A gets submitted, it consumes all the task slots.

Quiz

6/10
Each node in your Hadoop cluster, running YARN, has 64GB memory and 24 cores. Your yarn.site.xml
has the following configuration:
<property>
<name>yarn.nodemanager.resource.memory-mb</name>
<value>32768</value>
</property>
<property>
<name>yarn.nodemanager.resource.cpu-vcores</name>
<value>12</value>
</property>
You want YARN to launch no more than 16 containers per node. What should you do?
Select the answer
1 correct answer
A.
Modify yarn-site.xml with the following property:
<name>yarn.scheduler.minimum-allocation-mb</name>
<value>2048</value>
B.
Modify yarn-sites.xml with the following property:
<name>yarn.scheduler.minimum-allocation-mb</name>
<value>4096</value>
C.
Modify yarn-site.xml with the following property:
<name>yarn.nodemanager.resource.cpu-vccores</name>
D.
No action is needed: YARN’s dynamic resource allocation automatically optimizes the node memory
and cores

Quiz

7/10
You want to node to only swap Hadoop daemon data from RAM to disk when absolutely necessary. What
should you do?
Select the answer
1 correct answer
A.
Delete the /dev/vmswap file on the node
B.
Delete the /etc/swap file on the node
C.
Set the ram.swap parameter to 0 in core-site.xml
D.
Set vm.swapfile file on the node
E.
Delete the /swapfile file on the node

Quiz

8/10
You are configuring your cluster to run HDFS and MapReducer v2 (MRv2) on YARN. Which two daemons
needs to be installed on your cluster’s master nodes? (Choose two)
Select the answer
2 correct answers
A.
HMaster
B.
ResourceManager
C.
TaskManager
D.
JobTracker
E.
NameNode
F.
DataNode

Quiz

9/10
You observed that the number of spilled records from Map tasks far exceeds the number of map output
records. Your child heap size is 1GB and your io.sort.mb value is set to 1000MB. How would you tune your
io.sort.mb value to achieve maximum memory to disk I/O ratio?
Select the answer
1 correct answer
A.
For a 1GB child heap size an io.sort.mb of 128 MB will always maximize memory to disk I/O
B.
Increase the io.sort.mb to 1GB
C.
Decrease the io.sort.mb value to 0
D.
Tune the io.sort.mb value until you observe that the number of spilled records equals (or is as close to
equals) the number of map output records.

Quiz

10/10
You are running a Hadoop cluster with a NameNode on host mynamenode, a secondary NameNode on
host mysecondarynamenode and several DataNodes.
Which best describes how you determine when the last checkpoint happened?
Select the answer
1 correct answer
A.
Execute hdfs namenode –report on the command line and look at the Last Checkpoint information
B.
Execute hdfs dfsadmin –saveNamespace on the command line which returns to you the last
checkpoint value in fstime file
C.
Connect to the web UI of the Secondary NameNode (http://mysecondary:50090/) and look at the "Last
Checkpoint” information
D.
Connect to the web UI of the NameNode (http://mynamenode:50070) and look at the "Last Checkpoint”
information
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  • Quiz name:Cloudera Certified Administrator for Apache Hadoop (CCAH)
  • Total number of questions:60
  • Number of questions for the test:50
  • Pass score:80%

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