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Guide for Cloudera Certified Developer for Apache Hadoop (CCDH)

Quiz Cloudera Certified Developer for Apache Hadoop (CCDH)

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/ 10

Quiz

1/10
When is the earliest point at which the reduce method of a given Reducer can be called?
Select the answer
1 correct answer
A.
As soon as at least one mapper has finished processing its input split.
B.
As soon as a mapper has emitted at least one record.
C.
Not until all mappers have finished processing all records.
D.
It depends on the InputFormat used for the job.

Quiz

2/10
Which describes how a client reads a file from HDFS?
Select the answer
1 correct answer
A.
The client queries the NameNode for the block location(s). The NameNode returns the block location(s)
to the client. The client reads the data directory off the DataNode(s).
B.
The client queries all DataNodes in parallel. The DataNode that contains the requested data responds
directly to the client. The client reads the data directly off the DataNode.
C.
The client contacts the NameNode for the block location(s). The NameNode then queries the
DataNodes for block locations. The DataNodes respond to the NameNode, and the NameNode
redirects the client to the DataNode that holds the requested data block(s). The client then reads the
data directly off the DataNode.
D.
The client contacts the NameNode for the block location(s). The NameNode contacts the DataNode
that holds the requested data block. Data is transferred from the DataNode to the NameNode, and then
from the NameNode to the client.

Quiz

3/10
You are developing a combiner that takes as input Text keys, IntWritable values, and emits Text keys,
IntWritable values. Which interface should your class implement?
Select the answer
1 correct answer
A.
Combiner <Text, IntWritable, Text, IntWritable>
B.
Mapper <Text, IntWritable, Text, IntWritable>
C.
Reducer <Text, Text, IntWritable, IntWritable>
D.
Reducer <Text, IntWritable, Text, IntWritable>
E.
Combiner <Text, Text, IntWritable, IntWritable>

Quiz

4/10
Indentify the utility that allows you to create and run MapReduce jobs with any executable or script as the
mapper and/or the reducer?
Select the answer
1 correct answer
A.
Oozie
B.
Sqoop
C.
Flume
D.
Hadoop Streaming
E.
mapred

Quiz

5/10
How are keys and values presented and passed to the reducers during a standard sort and shuffle phase
of MapReduce?
Select the answer
1 correct answer
A.
Keys are presented to reducer in sorted order; values for a given key are not sorted.
B.
Keys are presented to reducer in sorted order; values for a given key are sorted in ascending order.
C.
Keys are presented to a reducer in random order; values for a given key are not sorted.
D.
Keys are presented to a reducer in random order; values for a given key are sorted in ascending order.

Quiz

6/10
Assuming default settings, which best describes the order of data provided to a reducer’s reduce method:
Select the answer
1 correct answer
A.
The keys given to a reducer aren’t in a predictable order, but the values associated with those keys
always are.
B.
Both the keys and values passed to a reducer always appear in sorted order.
C.
Neither keys nor values are in any predictable order.
D.
The keys given to a reducer are in sorted order but the values associated with each key are in no
predictable order

Quiz

7/10
You wrote a map function that throws a runtime exception when it encounters a control character in input
data. The input supplied to your mapper contains twelve such characters totals, spread across five file
splits. The first four file splits each have two control characters and the last split has four control
characters.
Indentify the number of failed task attempts you can expect when you run the job with
mapred.max.map.attempts set to 4:
Select the answer
1 correct answer
A.
You will have forty-eight failed task attempts
B.
You will have seventeen failed task attempts
C.
You will have five failed task attempts
D.
You will have twelve failed task attempts
E.
You will have twenty failed task attempts

Quiz

8/10
You want to populate an associative array in order to perform a map-side join. You’ve decided to put this
information in a text file, place that file into the DistributedCache and read it in your Mapper before any
records are processed.
Indentify which method in the Mapper you should use to implement code for reading the file and populating
the associative array?
Select the answer
1 correct answer
A.
combine
B.
map
C.
init
D.
configure

Quiz

9/10
You’ve written a MapReduce job that will process 500 million input records and generated 500 million key-
value pairs. The data is not uniformly distributed. Your MapReduce job will create a significant amount of
intermediate data that it needs to transfer between mappers and reduces which is a potential bottleneck. A
custom implementation of which interface is most likely to reduce the amount of intermediate data
transferred across the network?
Select the answer
1 correct answer
A.
Partitioner
B.
OutputFormat
C.
WritableComparable
D.
Writable
E.
InputFormat
F.
Combiner

Quiz

10/10
Can you use MapReduce to perform a relational join on two large tables sharing a key? Assume that the
two tables are formatted as comma-separated files in HDFS.
Select the answer
1 correct answer
A.
Yes.
B.
Yes, but only if one of the tables fits into memory
C.
Yes, so long as both tables fit into memory.
D.
No, MapReduce cannot perform relational operations.
E.
No, but it can be done with either Pig or Hive.
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  • Quiz name:Cloudera Certified Developer for Apache Hadoop (CCDH)
  • Total number of questions:60
  • Number of questions for the test:50
  • Pass score:80%

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