Examcollection ccD-410 Study Material

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Cloudera
CCD-410 Cloudera Certified Developer for Apache
Hadoop (CCDH)
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What is ccD-410 Certification Exam..??
Cloudera CCD-410 practice exam test questions
cover ALL the Exam Objectives you will be tested
on in order to pass your CCD-410 exam on your
First Try! With FirstTryCertify CCD-410 questions
and answers, you will successfully pass your
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Information of ccD-410 Certification Exam

• Vendor Cloudera
• Certifications Cloudera Certified Developer for
  Apache Hadoop (CCDH)
• Exam Code ccD-410
• Total Questions 60 QAs

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Question Answer of Cloudera CCD-410 Practice
Exam..
QUESTION 1 Combiners Increase the efficiency of
a MapReduce program because A. They provide a
mechanism for different mappers to communicate
with each Other, thereby reducing synchronization
overhead. B. They provide an optimization and
reduce the total number of computations that are
needed to execute an algorithm by a factor of n,
where is the number of reducer. C. They aggregate
intermediate map output locally on each
individual machine and therefore reduce the
amount of data that needs to be shuffled across
the network to the reducers. D. They aggregate
intermediate map output horn a small number of
nearby (i.e., rack-local) machines and therefore
reduce the amount of data that needs to be
shuffled across the network to the reducers.
Answer C
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Question Answer of Cloudera CCD-410 Practice
Exam..
QUESTION 2 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. m B. r C. mr (i.e., m plus r) D. mxr
(i.e., m multiplied by r) E. mr (i.e., m to the
power of r) Answer D
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Question Answer of Cloudera CCD-410 Practice
Exam..
QUESTION 3 What happens in a MapReduce job when
you set the number of reducers to one? A. A
single reducer gathers and processes all the
output from all the mappers. The output
is written in as many separate files as there are
mappers. B. A single reducer gathers and
processes all the output from all the mappers.
The output is written to a single file in
HDFS. C. Setting the number of reducers to one
creates a processing bottleneck, and since the
number of reducers as specified by the programmer
is used as a reference value only, the MapReduce
runtime provides a default setting for the number
of reducers. D. Setting the number of reducers to
one is invalid, and an exception is
thrown. Answer A
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Question Answer of Cloudera CCD-410 Practice
Exam..
QUESTION 4 In the standard word count MapReduce
algorithm, why might using a combiner reduce
the overall Job running time? A. Because
combiners perform local aggregation of word
counts, thereby allowing the mappers to process
input data faster. B. Because combiners perform
local aggregation of word counts, thereby
reducing the number of mappers that need to
run. C. Because combiners perform local
aggregation of word counts, and then transfer
that data to reducers without writing the
intermediate data to disk. D. Because combiners
perform local aggregation of word counts, thereby
reducing the number of key-value pairs that need
to be snuff let across the network to the
reducers. Answer A
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Question Answer of Cloudera CCD-410 Practice
Exam..
QUESTION 5 Which two of the following are valid
statements? (Select two) A. HDFS is optimized
for storing a large number of files smaller than
the HDFS block size. B. HDFS has the
Characteristic of supporting a "write once, read
many" data access model. C. HDFS is a distributed
file system that replaces ext3 or ext4 on Linux
nodes in a Hadoop cluster. D. HDFS is a
distributed file system that runs on top of
native OS filesystems and is well suited to
storage of very large data sets. Answer B, D
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Question Answer of Cloudera CCD-410 Practice
Exam..
QUESTION 6 You need to create a GUI application
to help your company's sales people add and edit
customer information. Would HDFS be appropriate
for this customer information file? A. Yes,
because HDFS is optimized for random access
writes. B. Yes, because HDFS is optimized for
fast retrieval of relatively small amounts of
data. C. No, because HDFS can only be accessed by
MapReduce applications. D. No, because HDFS is
optimized for write-once, streaming access for
relatively large files. Answer D
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Question Answer of Cloudera CCD-410 Practice
Exam..
QUESTION 7 Which of the following describes how
a client reads a file from HDFS? 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 directly 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. Answer C
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Question Answer of Cloudera CCD-410 Practice
Exam..
QUESTION 8 Which of the following statements
best describes how a large (100 GB) file is
stored in HDFS? A. The file is divided into
variable size blocks, which are stored on
multiple data nodes. Each block is replicated
three times by default. B. The file is replicated
three times by default. Each copy of the file is
stored on a separate datanodes. C. The master
copy of the file is stored on a single datanode.
The replica copies are divided into fixed-size
blocks, which are stored on multiple
datanodes. D. The file is divided into fixed-size
blocks, which are stored on multiple datanodes.
Each block is replicated three times by default.
Multiple blocks from the same file might reside
on the same datanode. E. The file is divided into
fixed-size blocks, which are stored on multiple
datanodes. Each block is replicated three times
by default. HDFS guarantees that different blocks
from the same file are never on the same
datanode. Answer E
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Question Answer of Cloudera CCD-410 Practice
Exam..
QUESTION 9 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 3 TB B. about 5 TB C. about 10 TB D. about
11 TB Answer A
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Question Answer of Cloudera CCD-410 Practice
Exam..
Question 10 When is the earliest point at which
the reduce method of a given Reducer can be
called? 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. Answer C
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