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

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Question 1

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?(Choose two)

A. Because there is a more than a single job on the cluster, the FIFO Scheduler will enforce a limit on the percentage of resources allocated to a particular job at any given time

B. Tasks are scheduled on the order of their job submission

C. The order of execution of job may vary

D. Given job A and submitted in that order, all tasks from job A are guaranteed to finish before all tasks from job B

E. The FIFO Scheduler will give, on average, and equal share of the cluster resources over the job lifecycle

F. The FIFO Scheduler will pass an exception back to the client when Job B is submitted, since all slots on the cluster are use

Correct Answer:AD

Question 2

Your company stores user profile records in an OLTP databases. You want to join these records with web server logs you have already ingested into the Hadoop file system. What is the best way to obtain and ingest these user records?

A. Ingest with Hadoop streaming

B. Ingest using Hive’s IQAD DATA command

C. Ingest with sqoop import

D. Ingest with Pig’s LOAD command

E. Ingest using the HDFS put command

Correct Answer:C

Question 3

Which three basic configuration parameters must you set to migrate your cluster from MapReduce 1 (MRv1) to MapReduce V2 (MRv2)?(Choose three)

A. Configure the NodeManager to enable MapReduce services on YARN by setting the following property in yarn-site.xml:<name>yarn.nodemanager.hostname</name><value>your_nodeManager_shuffle</value>

B. Configure the NodeManager hostname and enable node services on YARN by setting the following property in yarn-site.xml:yarn.nodemanager.hostnameyour_nodeManager_hostname

C. Configure a default scheduler to run on YARN by setting the following property in mapred-site.xml:mapreduce.jobtracker.taskSchedulerorg.apache.hadoop.mapred.JobQueueTaskScheduler

D. Configure the number of map tasks per jon YARN by setting the following property in mapred:mapreduce.job.maps2

E. Configure the ResourceManager hostname and enable node services on YARN by setting the following property in yarn-site.xml:yarn.resourcemanager.hostnameyour_resourceManager_hostname

F. Configure MapReduce as a Framework running on YARN by setting the following property in mapred-site.xml:mapreduce.framework.nameyarn

Correct Answer:AEF

Question 4

You need to analyze 60,000,000 images stored in JPEG format, each of which is approximately 25 KB. Because you Hadoop cluster isn’t optimized for storing and processing many small files, you decide to do the following actions:
1. Group the individual images into a set of larger files
2. Use the set of larger files as input for a MapReduce job that processes them directly with python using Hadoop streaming.
Which data serialization system gives the flexibility to do this?

A. CSV

B. XML

C. HTML

D. Avro

E. SequenceFiles

F. JSON

Correct Answer:E
Sequence files are block-compressed and provide direct serialization and deserialization of several arbitrary data types (not just text). Sequence files can be generated as the output of other MapReduce tasks and are an efficient intermediate representation for data that is passing from one MapReduce job to anther.

Question 5

You decide to create a cluster which runs HDFS in High Availability mode with automatic failover, using Quorum Storage. What is the purpose of ZooKeeper in such a configuration?

A. It only keeps track of which NameNode is Active at any given time

B. It monitors an NFS mount point and reports if the mount point disappears

C. It both keeps track of which NameNode is Active at any given time, and manages the Edits fil

D. Which is a log of changes to the HDFS filesystem

E. If only manages the Edits file, which is log of changes to the HDFS filesystem

F. Clients connect to ZooKeeper to determine which NameNode is Active

Correct Answer:A
Reference: Reference:http://www.cloudera.com/content/cloudera-content/cloudera-docs/CDH4/latest/PDF/CDH4-High-Availability-Guide.pdf(page 15)

Question 6

Identify two features/issues that YARN is designated to address:(Choose two)

A. Standardize on a single MapReduce API

B. Single point of failure in the NameNode

C. Reduce complexity of the MapReduce APIs

D. Resource pressure on the JobTracker

E. Ability to run framework other than MapReduce, such as MPI

F. HDFS latency

Correct Answer:DE
Reference:http://www.revelytix.com/?q=content/hadoop-ecosystem(YARN, first para)

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