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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. You are running a Hadoop cluster with NameNode on host mynamenode, a secondary NameNode on host mysecondary and DataNodes.
Which best describes how you determine when the last checkpoint happened?

A) Connect to the web UI of the Secondary NameNode (http://mysecondarynamenode:50090) and look at the "Last Checkpoint" information
B) Connect to the web UI of the NameNode (http://mynamenode:50070/) and look at the "Last Checkpoint" information
C) Execute hdfs dfsadmin -saveNameSpace on the command line which returns to you the last checkpoint value in fstime file.
D) Execute hdfs dfsadmin -report on the command line in and look at the Last Checkpoint information.

2. What two processes must you do if you are running a Hadoop cluster with a single NameNode and six DataNodes, and you want to change a configuration parameter so that it affects all six DataNodes.

A) You must restart the NameNode daemon to apply the changes to the cluster
B) You must modify the configuration files on the NameNode only. DataNodes read their configuration from the master nodes.
C) You must modify the configuration files on only one of the DataNode machine
D) You don't need to restart any daemon, as they will pick up changes automatically.
E) You must modify the configuration files on each of the six DataNode machines.
F) You must restart all six DataNode daemons to apply the changes to the cluster.

3. You has a cluster running with the Fail Scheduler enabled. There are currently no jobs running on the cluster 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 al the same time. How will the Fair' Scheduler handle these two Jobs?

A) When job A gets submitted, it doesn't consume all the task slot
B) When job B gets submitted, Job A has to finish first, before job it can get scheduled.
C) When job A gets submitted, it consumes all the task slot
D) When job B gets submitted, it will get assigned tasks, while job A continues to run with fewer tasks.

4. You configure your hadoop development cluster with both mapreduce frameworks, mapreduceV1 (MRv1) and mapreduce v2 (MRv2/YARN). You plan to run only one set of mapreduce daemons at a time in this development environment (running both simultaneously results in an unsuitable cluster but configure in both moving between them is fine). Which two mapreduce (capitation) daemons do you need to configure to run on your masternodes?

A) Jobtracker
B) Containermanager
C) Journalnode
D) Resourcemanager
E) Applicationmaster
F) Nodemanager

5. What are the permissions of a file in HDFS with the following:rw-rw-r-x?

A) HDFS runs in user space which makes all users with access to the namespace able to read, write and modify all files
B) the owner and group can read the file other can't
C) the owner and group can modify the contents of the file other can't
D) No one can modify the content of the file
E) the owner and group cannot delete the file, but other can

Solutions: