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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. 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) Dskchk
D) Du
E) Fsck

2. You set mapred.tasktracker.reduce.tasks.maximum to a value of 4 on a cluster running mapreduce v1 (MRv1). How many reducers will run for any given job?

A) a maximum of 4 reducer's, but the actual number of reducer's that run for any given job is based on the volume intermediate data.
B) The number of reducer's for any given job is set by the developer
C) Four reducer's will run. Once set by the cluster administrator, this parameter can't be overridden
D) Maximum of 4 reducers, but the actual number of reducers that run for any given job is based on the volume of input data

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) 12
C) 2
D) 24
E) 16.
F) 20

4. Choose which best describe a Hadoop cluster's block size storage parameters once you set the HDFS default block size to 64MB?

A) The block size of files in the duster will all at least be 64MB.
B) The block size of files in the cluster will all be the exactly 64MB.
C) The block size of files in the cluster can be determined as the block is written.
D) The block size of files in the Cluster will all be multiples of 64M

5. Which three distcp features can you utilize on a Hadoop cluster?

A) Use distcp to copy physical blocks from the source to the target destination in your cluster.
B) Use distcp to copy HBase table files.
C) Use distcp to copy data between directories inside the same cluster.
D) Use distcp to copy files only between two clusters or more. You cannot use distcp to copy data between directories inside the same cluster.
E) Use distcp to run an internal MapReduce job to copy files.

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