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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. How must you format the underlying filesystem of your Hadoop cluster's slave nodes running on Linux?

A) They may be formatted in nay Linux filesystem
B) They must be formatted as either ext3 or ext4
C) They must not be formatted - - HDFS will format the filesystem automatically
D) They must be formatted as HDFS

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

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

3. Each slave node in your cluster has four 2 TB hard drives installed (4x2TB). You set a value of the dfs.du.datanode.received parameter to 100GB on each slave node. How does this alter HDFS block storage?

A) All Hard drives may be used to store HDFS blocks as long as at least 100GB in total is available on the node
B) a maximum of 100GB on each hard drive may be used to store HDFS blocks
C) 25 GB on each hard drive may not be used to store HDFS Blocks
D) 100 GB on each hard drive may not be used to store HDFS blocks

4. Your running a hadoop cluster with a name node on the host mynamenode.
What are two ways you can determine available HDFS space in your cluster?

A) Run hadoop dfsadmin - report and locate the DFS remaming value
B) Run hadoop fs -du / and locate the dfs remaining value
C) Connect to http://mynamenode:50070/and locate the dfs remaining value
D) Run hadoop DFSAdmin -spaceQuota and subtract DFS used % from configured capacity

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

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

Solutions: