Question: Select the purpose of using ssh-copy-id when preparing Ubuntu for a Hadoop install.
key generation
passwordless login
Ans:- passwordless login
Question: Select one of the impacts of running hadoop namenode -format that we should be aware of.
Hadoop settings will be lost
Any existing data in HDFS will be lost
Ans:-Any existing data in HDFS will be lost
Question: On which node must the workers configuration file be updated in Hadoop?
all nodes
new nodes only
Ans:- all nodes
Question: In deployments larger than three racks, which configuration is common for Hadoop nodes?
Worker nodes only
One master and the remaining are worker nodes
Ans:- Worker nodes only
Question: When adding a new node to an existing cluster, what command line utility can we run to verify that the new node is running Hadoop?
ssh
hadoop -uptime
Ans:- hadoop -uptime
Question: Which hadoop command function do we run to copy a local file to a running HDFS?
hadoop -copyFromLocal
hadoop -copyToLocal
Ans:- hadoop -copyFromLocal
Question: Which hadoop command function do we run to copy a file from a hadoop HDFS to the local node?
hadoop -copyToLocal
hadoop -copyFromLocal
hadoop -cat
Ans:- hadoop -copyToLocal
Hadoop on Amazon EMR
Question: Select the benefits of using Hadoop on Amazon EMR.
Dynamic sizing
Latest Apache Hadoop releases
Pay for what you use
Access to common Hadoop tools
Ans:-
Dynamic sizing
Pay for what you use
Access to common Hadoop tools
Question: Select the type of authentication used to connect to nodes in an EMR cluster.
Guest account access
Key-based authentication
Ans:- Key-based authentication
Question: Select the two main elements comprising EMRFS.
Amazon S3
Amazon Redshift
HDFS
Ans:-
Amazon S3
HDFS
Question: Select the Amazon service which stores the Hadoop log files.
CloudFront
S3
Ans:- S3
Question: Select the EMR data typically stored in S3.
HDFS
Output
Logs
Input
NameNode metadata
Ans:-
Output
Logs
Input
Question: When running scripts in the Amazon EMR web console, under which tab is the MapReduce job launched from?
Jobs
Steps
Ans:- Steps
Question: What is the result of the following AWS CLI command?
The file ulysses.txt is uploaded to the input folder
The contents of the input folder is overwritten by ulysses.txt
Ans:- The file ulysses.txt is uploaded to the input folder
Question: Upon a successful execution of ‘aws emr add-steps’, what is returned by the command?
0
A new step id
Ans:- A new step id
Question: Once an EMR cluster has completed, how is it finally terminated?
It must be terminated manually
It will terminate automatically once all of its HDFS data is backed up
Ans:- It must be terminated manually
