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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Once a client application validates its identity and is granted access to file in a cluster. What is the reminder of read path back to the client?

A) The namenode gives the client the block ID's and a list of Datanodes on which those blocks are found. And the application reads the block directly from the datanodes
B) The namenode maps the read request against the block locations in it's stored metadata the block id's are stored by their distance to the client and moved to the datanode closest to the client according to hadoop rac topology. The client application then reads the blocks from the single datanode
C) the namenode maps the read request against the block locations in its stored metadata and reads those blocks from the datanodes. The client applications then read the block from the namenode

2. The most important consideration for slave nodes in a Hadoop cluster running production jobs that require short turnaround times is:

A) The ratio between the amount of memory and the number of disk drives.
B) The ratio between the number of processor cores and total storage capacity.
C) The ratio between the number of processor cores and the amount of memory.
D) The ratio between the amount of memory and the total storage capacity.
E) The ratio between the number of processor cores and number of disk drives.

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

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

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

5. Identify which two daemons typically run each slave node in a Hadoop cluster running MapReduce v1 (MRv1)

A) Secondary NameNode
B) DataNode
C) NameNode
D) NodeManager
E) JobTracker
F) TaskTracker

Solutions: