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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. For a MapReduce job, on a cluster running MapReduce v1 (MRv1), what's the relationship between tasks and task templates?

A) There are always at most as many tasks attempts as there are tasks.
B) The developer sets the number of task attempts on job submission.
C) There are always at least as many task attempts as there are tasks.
D) There are always exactly as many task attempts as there are tasks.

2. Which command does Hadoop offer to discover missing or corrupt HDFS data?

A) Du
B) Fsck
C) Hadoop does not provide any tools to discover missing or corrupt data; there is no need because three replicas are kept for each data block.
D) Dskchk
E) The map-only checksum utility,

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

4. What is the recommended disk configuration for slave nodes in your Hadoop cluster with 6 x 2 TB hard drives?

A) RAID 5
B) JBOD
C) RAID 10
D) RAID 1+0

5. Which daemons instantiates JVM's to perform mapreduce processing in a cluster running mapreduce v1 (MRv1)?

A) Nodemanager
B) Jobtracker
C) Tasktracker
D) Namenode
E) Applicationmaster
F) applicationmanager
G) Datanode
H) Resourcemanager

Solutions: