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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. In a large MapReduce job with m mappers and r reducers, how many distinct copy operations will there be in the sort/shuffle phase?

A) mxr (i.e., m multiplied by r)
B) mr (i.e., m to the power of r)
C) m+r (i.e., m plus r)
D) m
E) r

2. Your client application submits a MapReduce job to your Hadoop cluster. The Hadoop framework looks for an available slot to schedule the MapReduce operations on which of the following Hadoop computing daemons?

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

3. You have a large dataset of key-value pairs, where the keys are strings, and the values are integers. For each unique key, you want to identify the largest integer. In writing a MapReduce program to accomplish this, can you take advantage of a combiner?

A) Yes, as long as all the keys fit into memory on each node.
B) No, a combiner would not be useful in this case.
C) Yes.
D) Yes, as long as all the integer values that share the same key fit into memory on each node.
E) Yes, but the number of unique keys must be known in advance.

4. Your cluster has 10 DataNodes, each with a single 1 TB hard drive. You utilize all your disk capacity for HDFS, reserving none for MapReduce. You implement default replication settings. What is the storage capacity of your Hadoop cluster (assuming no compression)?

A) about 10 TB
B) about 11 TB
C) about 3 TB
D) about 5 TB

5. Which of the following best describes the workings of TextInputFormat?

A) The input file is split exactly at the line breaks, so each Record Reader will read a series of complete lines.
B) Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReader of the split that contains the beginning of the broken line.
C) Input file splits may cross line breaks. A line that crosses tile splits is ignored.
D) Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReader of the split that contains the end of the broken line.
E) Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReaders of both splits containing the broken line.

Solutions: