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Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) Sample Questions:

1. You install Cloudera Manager on a cluster where each host has 1 GB of RAM. All of the services show their status as concerning. However, all jobs submitted complete without an error.
Why is Cloudera Manager showing the concerning status KM the services?

A) A slave node's disk ran out of space
B) The slave nodes are swapping.
C) The slave nodes, haven't sent a heartbeat in 60 minutes
D) DataNode service instance has crashed.

2. On a cluster running MapReduce v1 (MRv1), the value of the mapred.tasktracker.map.tasks.maximum configuration parameter in the mapred-site.xml file should be set to:

A) Half the number of the maximum number of Reduce tasks which can run on the cluster as a whole.
B) Half the number of the maximum number of Reduce tasks which can run simultaneously on an individual node.
C) The maximum number of Map tasks can run simultaneously on an individual node.
D) The maximum number of Map tasks which can run on the cluster as a whole.
E) The same value on each slave node.

3. Under which of the following scenarios would it be most appropriate to consider using faster (e.g., 10 Gigabit) Ethernet as the network fabric for your Hadoop cluster?

A) When the typical workload consists of processor-intensive tasks.
B) When the typical workload generates a large amount of output data, significantly larger than the amount of intermediate data.
C) When the typical workload generates a large amount of intermediate data, on the order of the input data itself.
D) When the typical workload consumes a large amount of input data, relative to the entire Canada of HDFS.

4. Which of the following scenarios makes HDFS unavailable?

A) NameNode failure
B) DataNode failure
C) Secondary NameNode failure
D) JobTracker failure
E) TaskTracker failure

5. Your cluster has nodes in seven racks, and you have provided a rack topology script. What is Hadoop's block placement policy, assuming a block replication factor of three?

A) Because there are seven racks the block is written to a node on each rack
B) All three of the block are written to nodes on the same rack
C) One copy of the block is written to a node in each of three racks
D) One copy of the block is written to a node in one rack; two copies are written to two nodes in a different rack

Solutions: