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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. You have a cluster running 32 slave nodes and 3 master nodes running mapreduce V1 (MRv1). You execute the command:
$ hadoop fsck /
What four cluster conditions running this command will return to you?

A) the current state of the file system according to the namenode
B) Configure capacity of your cluster
C) Under-replicated blocks
D) Number of datanodes
E) the location for every block
F) Blocks replicated improperly or that don't satisfy your cluster enhancement policy (e. g. , too many blocks replicated on the same node)
G) Number of dead datanodes
H) The current state of the file system returned from scanning individual blocks on each datanode

2. Your cluster Mode size is set to 128MB. A client application (client application A) is writing a 500MB file to HDFS. After client application A has written 300MB of data, another client (client application B) attempts to read the file. What is the effect of a second client requesting a file during a write?

A) Client application B must wait until the entire file has been written, and will then read its entire contents.
B) Client application on B can read the 300MB that has been written so far.
C) Client application B returns an error
D) Application B can read 256MB of the file

3. Identify the daemon that performs checkpoint operations of the namespace state in a cluster configured with HDFS High Availability (HA) using Quorum based-storage?

A) CheckpointNode
B) Standby NameNode
C) JournalNode
D) BackupNode
E) NameNode
F) NodeManeger
G) Secondary NameNode

4. You configure you cluster with HDFS High Availability (HA) using Quorum-Based storage. You do
not implement HDFS Federation.
What is the maximum number of NameNodes daemon you should run on you cluster in order to avoid a "split-brain" scenario with your NameNodes?

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

5. Which three file actions can execute as you write a file into HDFS?

A) You can move the file
B) You can delete the file
C) You can update the files contents
D) You can index the file
E) You can rename the file

Solutions: