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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. What four functions do scheduling algorithms perform on hadoop cluster?

A) Ensure data locality by ordering map tasks so that they run on data local maps slots
B) allow short jobs to complete even when large, long jobs (consuming a lot of resources are running)
C) Run jobs at periodic times of the day
D) support the implementation of service-level agreements for multiple cluster users
E) Reduce the total amount of computation necessary to complete a job.
F) Reduce the job latencies in environment with multiple jobs of different sizes
G) Allow multiple users to share clusters in a predictable policy-guided manner

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

3. A slave node in your cluster has 24GB of Ram and 12 physical processor cores on hyper threading-enabled processor. You set the value of mapped. child.java.opts to -Xmx1G, and the value of mapred.tasktracker.map.tasks.maximum to 12. What is the appropriate value to set for mapred.Tastracker.reduce.tasks.maximum?

A) 6
B) 2
C) 20
D) 16.
E) 12
F) 24

4. You set the value of dfs.block.size to 64MB in hdfs-site.xml on a client machine, but you set the same property to 128MB on your clusters name node. What happens when the client writes a file to HDFS?

A) A block size of 64MB will be used
B) An execution will be thrown when the client attempts to write the file, because the values are different.
C) A block size of 128MB will be used
D) The file will be written successfully with a block size of 64MB but client attempting to read the file will fail because the namenode believes the blocks to be 128MB in size

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

A) The map-only checksum utility,
B) 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.
C) Fsck
D) Dskchk
E) Du

Solutions: