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NO.1 You observed that the number of spilled records from Map tasks far exceeds the number of
map output records. Your child heap size is 1GB and your io.sort.mb value is set to 1000MB. How
would you tune your io.sort.mb value to achieve maximum memory to disk I/O ratio?
A. For a 1GB child heap size an io.sort.mb of 128 MB will always maximize memory to disk I/O
B. Increase the io.sort.mb to 1GB
C. Decrease the io.sort.mb value to 0
D. Tune the io.sort.mb value until you observe that the number of spilled records equals (or is as
close to equals) the number of map output records.
Answer: D

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NO.2 For each YARN job, the Hadoop framework generates task log file. Where are Hadoop task log
files stored?
A. Cached by the NodeManager managing the job containers, then written to a log directory on the
NameNode
B. Cached in the YARN container running the task, then copied into HDFS on job completion
C. In HDFS, in the directory of the user who generates the job
D. On the local disk of the slave mode running the task
Answer: D

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NO.3 Your Hadoop cluster is configuring with HDFS and MapReduce version 2 (MRv2) on YARN. Can
you configure a worker node to run a NodeManager daemon but not a DataNode daemon and still
have a functional cluster?
A. Yes. The daemon will receive data from the NameNode to run Map tasks
B. Yes. The daemon will get data from another (non-local) DataNode to run Map tasks
C. Yes. The daemon will receive Map tasks only
D. Yes. The daemon will receive Reducer tasks only
Answer: A

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NO.4 You have installed a cluster HDFS and MapReduce version 2 (MRv2) on YARN. You have no
dfs.hosts entry(ies) in your hdfs-site.xml configuration file. You configure a new worker node by
setting fs.default.name in its configuration files to point to the NameNode on your cluster, and you
start the DataNode daemon on that worker node. What do you have to do on the cluster to allow
the worker node to join, and start sorting HDFS blocks?
A. Without creating a dfs.hosts file or making any entries, run the commands
hadoop.dfsadmin-refreshModes on the NameNode
B. Restart the NameNode
C. Creating a dfs.hosts file on the NameNode, add the worker Node's name to it, then issue the
command hadoop dfsadmin -refresh Nodes = on the Namenode
D. Nothing; the worker node will automatically join the cluster when NameNode daemon is started
Answer: A

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NO.5 You are running a Hadoop cluster with a NameNode on host mynamenode, a secondary
NameNode on host mysecondarynamenode and several DataNodes.
Which best describes how you determine when the last checkpoint happened?
A. Execute hdfs namenode -report on the command line and look at the Last Checkpoint
information
B. Execute hdfs dfsadmin -saveNamespace on the command line which returns to you the last
checkpoint value in fstime file
C. Connect to the web UI of the Secondary NameNode (http://mysecondary:50090/) and look at the
"Last Checkpoint" information
D. Connect to the web UI of the NameNode (http://mynamenode:50070) and look at the "Last
Checkpoint" information
Answer: B

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Reference:https://www.inkling.com/read/hadoop-definitive-guide-tom-white-3rd/chapter10/hdfs

NO.6 Choose three reasons why should you run the HDFS balancer periodically?
A. To ensure that there is capacity in HDFS for additional data
B. To ensure that all blocks in the cluster are 128MB in size
C. To help HDFS deliver consistent performance under heavy loads
D. To ensure that there is consistent disk utilization across the DataNodes
E. To improve data locality MapReduce
Answer: D

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Explanation:
NOTE: There is only one correct answer in the options for this question. Please check the following
reference:
http://www.quora.com/Apache-Hadoop/It-is-recommended-that-you-run-the-HDFSbalancer-period
ically-Why-Choose-3

NO.7 On a cluster running MapReduce v2 (MRv2) on YARN, a MapReduce job is given a directory of
10 plain text files as its input directory. Each file is made up of 3 HDFS blocks. How many Mappers
will run?
A. We cannot say; the number of Mappers is determined by the ResourceManager
B. We cannot say; the number of Mappers is determined by the developer
C. 30
D. 3
E. 10
F. We cannot say; the number of mappers is determined by the ApplicationMaster
Answer: E

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NO.8 You are planning a Hadoop cluster and considering implementing 10 Gigabit Ethernet as the
network fabric.
Which workloads benefit the most from faster network fabric?
A. When your workload generates a large amount of output data, significantly larger than the
amount of intermediate data
B. When your workload consumes a large amount of input data, relative to the entire capacity if
HDFS
C. When your workload consists of processor-intensive tasks
D. When your workload generates a large amount of intermediate data, on the order of the input
data itself
Answer: A

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NO.1 Refer to the exhibit.
Which point in the figure is the mean?
A. A
B. B
C. C
Answer: B

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NO.2 Refer to the exhibit.
Which point in the figure is the mode?
A. A
B. B
C. C
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or not a given individual is susceptible to developing autism?
A. Native Bayes
B. Linear Regression
C. Survival analysis
D. Sequencealignment
Answer: B

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NO.4 Refer to the exhibit.
Which point in the figure is the median?
A. A
B. B
C. C
Answer: A

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NO.5 What is default delimiter for Hive tables?
A.

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NO.1 A slave node in your cluster has four 2TB hard drives installed (4 x 2TB). The DataNode is
configured to store HDFS blocks on the disks. You set the value of the dfs.datanode.du.reserved
parameter to 100GB. How does this alter HDFS block storage?
A. A maximum of 100 GB on each hard drive may be used to store HDFS blocks
B. All hard drives may be used to store HDFS blocks as long as atleast 100 GB in total is available on
the node
C. 100 GB on each hard drive may not be used to store HDFS blocks
D. 25 GB on each hard drive may not be used to store HDFS blocks
Answer: B

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NO.2 Your cluster implements HDFS High Availability (HA). Your two NameNodes are named nn01
and nn02. What occurs when you execute the command: hdfs haadmin -failover nn01 nn02
A. nn02 becomes the standby NameNode and nn01 becomes the active NameNode
B. nn02 is fenced, and nn01 becomes the active NameNode
C. nn01 becomes the standby NamNode and nn02 becomes the active NAmeNode
D. nn01 is fenced, and nn02 becomes the active NameNode
Answer: D

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Explanation:
failover - initiate a failover between two NameNodes This subcommand causes a failover from the
first provided NameNode to the second. If the first NameNode is in the Standby state, this
command simply transitions the second to the Active state without error. If the first NameNode is in
the Active state, an attempt will be made to gracefully transition it to the Standby state. If this fails,
the fencing methods (as configured by dfs.ha.fencing.methods) will be attempted in order until one
of the methods succeeds. Only after this process will the second NameNode be transitioned to the
Active state. If no fencing method succeeds, the second NameNode will not be transitioned to the
Active state, and an error will be returned.

NO.3 Your cluster's mapped-site.xml includes the following parameters
<name>mapreduce.map.memory.mb</name> <value>4096<value/>
<name>mapreduce.reduce.memory,mb</name> <value>8192</value>
And your cluster's yarn-site.xml includes the following parameters
<name>yarn.nodemanager/vmen-pmem-ratio</name> <value>2.1</value>
What is the maximum amount of virtual memory allocated for each map before YARN will kill its
Container?
A. 4 GB
B. 17.2 GB
C. 24.6 GB
D. 8.2 GB
Answer: B

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NO.4 You decide to create a cluster which runs HDFS in High Availability mode with automatic
failover, using Quorum-based Storage. What is the purpose of ZooKeeper in such a configuration?
A. It manages the Edits file, which is a log changes to the HDFS filesystem.
B. It monitors an NFS mount point and reports if the mount point disappears
C. It both keeps track of which NameNode is Active at any given time, and manages the Edits file,
which is a log of changes to the HDFS filesystem
D. It only keeps track of which NameNode is Active at any given time
E. Clients connect toZoneKeeper to determine which NameNode is Active
Answer: D

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Reference:http://www.cloudera.com/content/cloudera-content/clouderadocs/CDH4 /latest/PDF/CD
H4-High-Availability-Guide.pdf(page 15)

NO.5 You suspect that your NameNode is incorrectly configured, and is swapping memory to disk.
Which Linux commands help you to identify whether swapping is occurring?
A. free
B. df
C. memcat
D. top
E. vmstat
F. swapinfo
Answer: C

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NO.6 Your Hadoop cluster is configured with HDFS and MapReduce version 2 (MRv2) on YARN. Can
you configure a worker node to run aNodeManager daemon but not a DataNode daemon and still
have a function cluster?
A. Yes. The daemon will receive data from the NameNode to run Map tasks
B. Yes. The daemon will get data from another (non-local) DataNode to run Map tasks
C. Yes. The daemon will receive Reduce tasks only
Answer: A

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NO.7 Which Yarn daemon or service monitors a Container's per-application resource usage (e.g,
memory, CPU)?
A. NodeManager
B. ApplicationMaster
C. ApplicationManagerService
D. ResourceManager
Answer: A

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Reference:http://docs.hortonworks.com/HDPDocuments/HDP2 /HDP-2.0.0.2 /bk_usingapache-hadoo
p/content/ch_using-apache-hadoop-4.html(4th para)

NO.8 You are the hadoop fs -put command to add a file "sales.txt" to HDFS. This file is small enough
that it fits into a single block, which is replicated to three nodes in your cluster (with a replication
factor of 3). One of the nodes holding this file (a single block) fails. How will the cluster handle the
replication of this file in this situation/
A. The cluster will re-replicate the file the next time the system administrator reboots the
NameNode daemon (as long as the file's replication doesn't fall two)
B. This file will be immediately re-replicated and all other HDFS operations on the cluster will halt
until the cluster's replication values are restored
C. The file will remain under-replicated until the administrator brings that nodes back online
D. The file will be re-replicated automatically after the NameNode determines it is under replicated
based on the block reports it receives from the DataNodes
Answer: B

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or not a given individual is susceptible to developing autism?
A. Native Bayes
B. Linear Regression
C. Survival analysis
D. Sequencealignment
Answer: B

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NO.2 Refer to the exhibit.
Which point in the figure is the mean?
A. A
B. B
C. C
Answer: B

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NO.3 You are working with a logistic regression model to predict the probability that a user will click
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aren't contributing to the model?
A. Convex
B. Uniform
C. L2
D. L1
Answer: A

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NO.4 Why should stop an interactive machine learning algorithm as soon as the performance of the
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B. To prevent overfitting
C. To increase the VC (VAPNIK-Chervonenkis) dimension for the model
D. To keep the number of terms in the model as possible
E. To maintain the highest VC (Vapnik-Chervonenkis) dimension for the model
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NO.5 What is the most common reason for a k-means clustering algorithm to returns a sub-optimal
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B. Input data set is too large
C. Non-normal distribution of the input data
D. Poor selection of the initial controls
Answer: C

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NO.6 Refer to the exhibit.
Which point in the figure is the median?
A. A
B. B
C. C
Answer: A

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NO.7 What is default delimiter for Hive tables?
A.

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Exam Name: Data Science Essentials Beta
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DS-200 Actual Test Total Q&A: 60 Questions and Answers
Last Update: 2014-07-22

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NO.1 Refer to the exhibit.
Which point in the figure is the mean?
A. A
B. B
C. C
Answer: B

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NO.2 Certain individuals are more susceptible to autism if they have particular combinations of
genes expressed in their DNA. Given a sample of DNA from persons who have autism and a sample
of DNA from persons who do not have autism, determine the best technique for predicting whether
or not a given individual is susceptible to developing autism?
A. Native Bayes
B. Linear Regression
C. Survival analysis
D. Sequencealignment
Answer: B

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NO.3 Under what two conditions does stochastic gradient descent outperform 2nd-order
optimization techniques such as iteratively reweighted least squares?
A. When the volume of input data is so large and diverse that a 2nd-order optimization technique
can be fit to a sample of the data
B. When the model's estimates must be updated in real-time in order to account for
newobservations.
C. When the input data can easily fit into memory on a single machine, but we want to calculate
confidence intervals for all of the parameters in the model.
D. When we are required to find the parameters that return the optimal value of the objective
function.
Answer: A,B

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NO.4 What is the result of the following command (the database username is foo and password is
bar)?
$ sqoop list-tables - -connect jdbc : mysql : / / localhost/databasename - -table - - username foo
-password bar
A. sqoop lists only those tables in the specified MySql database that have not already been
imported into FDFS
B. sqoop returns an error
C. sqoop lists the available tables from the database
D. sqoopimports all the tables from SQLHDFS
Answer: C

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Reference:https://www.inkling.com/read/hadoop-definitive-guide-tom-white-3rd/chapter-15 /gettin
gsqoop

NO.5 What is default delimiter for Hive tables?
A.

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Exam Code: CCD-470
Exam Name: Cloudera (Cloudera Certified Developer for Apache Hadoop CDH4 Upgrade Exam (CCDH))
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Total Q&A: 94 Questions and Answers
Last Update: 2014-04-27

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NO.1 Which 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 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.
Answer: C

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NO.2 You are running a job that will process a single InputSplit on a cluster which has no other jobs
currently running. Each node has an equal number of open Map slots. On which node will Hadoop
first attempt to run the Map task?
A. The node with the most memory
B. The node with the lowest system load
C. The node on which this InputSplit is stored
D. The node with the most free local disk space
Answer: C

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NO.3 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?
A. combine
B. map
C. init
D. configure
Answer: D

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NO.4 What happens in a MapReduce job when you set the number of reducers to zero?
A. No reducer executes, but the mappers generate no output.
B. No reducer executes, and the output of each mapper is written to a separate file in HDFS.
C. No reducer executes, but the outputs of all the mappers are gathered together and written to a
single file in HDFS.
D. Setting the number of reducers to zero is invalid, and an exception is thrown.
Answer: B

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NO.5 Assuming default settings, which best describes the order of data provided to a reducer’s
reduce
method:
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
Answer: D

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NO.6 What data does a Reducer reduce method process?
A. All the data in a single input file.
B. All data produced by a single mapper.
C. All data for a given key, regardless of which mapper(s) produced it.
D. All data for a given value, regardless of which mapper(s) produced it.
Answer: C

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NO.7 Identify the tool best suited to import a portion of a relational database every day as files into
HDFS, and generate Java classes to interact with that imported data?
A. Oozie
B. Flume
C. Pig
D. Hue
E. Hive
F. Sqoop
G. fuse-dfs
Answer: F

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Exam Code: CCB-400
Exam Name: Cloudera (Cloudera Certified Specialist in Apache HBase)
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Total Q&A: 45 Questions and Answers
Last Update: 2013-12-08

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NO.1 Under default settings, which feature of HBase ensures that data won't be lost in the event of
a Region Server failure?
A. AllHBase activity is written to the WAL, which is stored in HDFS
B. All operations are logged on theHMaster.
C. HBase is ACID compliant, which guarantees that itis Durable.
D. Data is stored on the local filesystem of the RegionServer.
Answer: A

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NO.2 You have an "Employees" table in HBase. The Row Keys are the employees' IDs. You would like
to retrieve all employees who have an employee ID between 'user_100' and 'user_110'.
The shell command you would use to complete this is:
A. scan'Employees', {STARTROW =>'user_100', STOPROW =>'user_111'}
B. get'Employees', {STARTROW =>'user_100', STOPROW =>'user_110'}
C. scan'Employees', {STARTROW =>'user_100', SLIMIT => 10}
D. scan'Employees', {STARTROW =>'user_100', STOPROW =>'user_110'}
Answer: D

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NO.3 You have one primary HMaster and one standby. Your primary HMaster Falls fails and your
client application needs to make a metadata change.
Which of the following is the effect on your client application?
A. The client will queryZooKeepertofind the location of the new HMaster and complete the
metadata change.
B. The client will make the metadata change regardless of the slate of the HMaster.
C. The new HMaster will notify the client and complete the metadata change.
D. Theclientapplication will fail with a runtime error.
Answer: A

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NO.4 You have an average key-value pair size of 100 bytes.
Your primary access is random needs on the table.
Which of the following actions will speed up random reading performance on your cluster?
A. Turn off WAL on puts
B. Increase the number of versions kept
C. Decrease the block size
D. Increase the block size
Answer: D

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NO.5 The cells in a given row have versions that range from 1000 to 2000. You execute a delete
specifying the value 3000 for the version.
What is the outcome?
A. The delete fails with an error.
B. Only cells equal to the Specified version are deleted.
C. The entire row is deleted.
D. Nothing in the row is deleted.
Answer: C

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Exam Code: CCA-410
Exam Name: Cloudera (Cloudera Certified Administrator for Apache Hadoop CDH4)
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Total Q&A: 60 Questions and Answers
Last Update: 2013-09-05

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NO.1 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 cluster can be determined as the block is written.
B. The block size of files in the Cluster will all be multiples of 64MB.
C. The block size of files in the duster will all at least be 64MB.
D. The block size of files in the cluster will all be the exactly 64MB.
Answer: D

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NO.2 How does HDFS Federation help HDFS Scale horizontally?
A. HDFS Federation improves the resiliency of HDFS in the face of network issues by removing the
NameNode as a single-point-of-failure.
B. HDFS Federation allows the Standby NameNode to automatically resume the services of an active
NameNode.
C. HDFS Federation provides cross-data center (non-local) support for HDFS, allowing a cluster
administrator to split the Block Storage outside the local cluster.
D. HDFS Federation reduces the load on any single NameNode by using the multiple, independent
NameNode to manage individual pars of the filesystem namespace.
Answer: D

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NO.3 How does the NameNode know DataNodes are available on a cluster running MapReduce v1
(MRv1)
A. DataNodes listed in the dfs.hosts file. The NameNode uses as the definitive list of available
DataNodes.
B. DataNodes heartbeat in the master on a regular basis.
C. The NameNode broadcasts a heartbeat on the network on a regular basis, and DataNodes
respond.
D. The NameNode send a broadcast across the network when it first starts, and DataNodes
respond.
Answer: B

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NO.4 What action occurs automatically on a cluster when a DataNode is marked as dead?
A. The NameNode forces re-replication of all the blocks which were stored on the dead DataNode.
B. The next time a client submits job that requires blocks from the dead DataNode, the JobTracker
receives no heart beats from the DataNode. The JobTracker tells the NameNode that the DataNode
is dead, which triggers block re-replication on the cluster.
C. The replication factor of the files which had blocks stored on the dead DataNode is temporarily
reduced, until the dead DataNode is recovered and returned to the cluster.
D. The NameNode informs the client which write the blocks that are no longer available; the client
then re-writes the blocks to a different DataNode.
Answer: A

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NO.5 Which two updates occur when a client application opens a stream to begin a file write on a
cluster running MapReduce v1 (MRv1)?
A. Once the write stream closes on the DataNode, the DataNode immediately initiates a black
report to the NameNode.
B. The change is written to the NameNode disk.
C. The metadata in the RAM on the NameNode is flushed to disk.
D. The metadata in RAM on the NameNode is flushed disk.
E. The metadata in RAM on the NameNode is updated.
F. The change is written to the edits file.
Answer: E,F

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NO.6 Which three distcp features can you utilize on a Hadoop cluster?
A. Use distcp to copy files only between two clusters or more. You cannot use distcp to copy data
between directories inside the same cluster.
B. Use distcp to copy HBase table files.
C. Use distcp to copy physical blocks from the source to the target destination in your cluster.
D. Use distcp to copy data between directories inside the same cluster.
E. Use distcp to run an internal MapReduce job to copy files.
Answer: B,D,E

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NO.7 For a MapReduce job, on a cluster running MapReduce v1 (MRv1), what's the relationship
between tasks and task templates?
A. There are always at least as many task attempts as there are tasks.
B. There are always at most as many tasks attempts as there are tasks.
C. There are always exactly as many task attempts as there are tasks.
D. The developer sets the number of task attempts on job submission.
Answer: A

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NO.1 Identify the tool best suited to import a portion of a relational database every day as files into
HDFS, and generate Java classes to interact with that imported data?
A. Oozie
B. Flume
C. Pig
D. Hue
E. Hive
F. Sqoop
G. fuse-dfs
Answer: F

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NO.2 What happens in a MapReduce job when you set the number of reducers to zero?
A. No reducer executes, but the mappers generate no output.
B. No reducer executes, and the output of each mapper is written to a separate file in HDFS.
C. No reducer executes, but the outputs of all the mappers are gathered together and written to a
single file in HDFS.
D. Setting the number of reducers to zero is invalid, and an exception is thrown.
Answer: B

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NO.3 You are running a job that will process a single InputSplit on a cluster which has no other jobs
currently running. Each node has an equal number of open Map slots. On which node will Hadoop
first attempt to run the Map task?
A. The node with the most memory
B. The node with the lowest system load
C. The node on which this InputSplit is stored
D. The node with the most free local disk space
Answer: C

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NO.4 What data does a Reducer reduce method process?
A. All the data in a single input file.
B. All data produced by a single mapper.
C. All data for a given key, regardless of which mapper(s) produced it.
D. All data for a given value, regardless of which mapper(s) produced it.
Answer: C

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NO.5 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?
A. combine
B. map
C. init
D. configure
Answer: D

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NO.6 Assuming default settings, which best describes the order of data provided to a reducer’s
reduce
method:
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
Answer: D

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NO.7 Which 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 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.
Answer: C

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NO.1 How does the NameNode know DataNodes are available on a cluster running MapReduce v1
(MRv1)
A. DataNodes listed in the dfs.hosts file. The NameNode uses as the definitive list of available
DataNodes.
B. DataNodes heartbeat in the master on a regular basis.
C. The NameNode broadcasts a heartbeat on the network on a regular basis, and DataNodes
respond.
D. The NameNode send a broadcast across the network when it first starts, and DataNodes
respond.
Answer: B

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NO.2 What action occurs automatically on a cluster when a DataNode is marked as dead?
A. The NameNode forces re-replication of all the blocks which were stored on the dead DataNode.
B. The next time a client submits job that requires blocks from the dead DataNode, the JobTracker
receives no heart beats from the DataNode. The JobTracker tells the NameNode that the DataNode
is dead, which triggers block re-replication on the cluster.
C. The replication factor of the files which had blocks stored on the dead DataNode is temporarily
reduced, until the dead DataNode is recovered and returned to the cluster.
D. The NameNode informs the client which write the blocks that are no longer available; the client
then re-writes the blocks to a different DataNode.
Answer: A

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NO.3 Which three distcp features can you utilize on a Hadoop cluster?
A. Use distcp to copy files only between two clusters or more. You cannot use distcp to copy data
between directories inside the same cluster.
B. Use distcp to copy HBase table files.
C. Use distcp to copy physical blocks from the source to the target destination in your cluster.
D. Use distcp to copy data between directories inside the same cluster.
E. Use distcp to run an internal MapReduce job to copy files.
Answer: B,D,E

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NO.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 cluster can be determined as the block is written.
B. The block size of files in the Cluster will all be multiples of 64MB.
C. The block size of files in the duster will all at least be 64MB.
D. The block size of files in the cluster will all be the exactly 64MB.
Answer: D

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NO.5 Which two updates occur when a client application opens a stream to begin a file write on a
cluster running MapReduce v1 (MRv1)?
A. Once the write stream closes on the DataNode, the DataNode immediately initiates a black
report to the NameNode.
B. The change is written to the NameNode disk.
C. The metadata in the RAM on the NameNode is flushed to disk.
D. The metadata in RAM on the NameNode is flushed disk.
E. The metadata in RAM on the NameNode is updated.
F. The change is written to the edits file.
Answer: E,F

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NO.6 How does HDFS Federation help HDFS Scale horizontally?
A. HDFS Federation improves the resiliency of HDFS in the face of network issues by removing the
NameNode as a single-point-of-failure.
B. HDFS Federation allows the Standby NameNode to automatically resume the services of an active
NameNode.
C. HDFS Federation provides cross-data center (non-local) support for HDFS, allowing a cluster
administrator to split the Block Storage outside the local cluster.
D. HDFS Federation reduces the load on any single NameNode by using the multiple, independent
NameNode to manage individual pars of the filesystem namespace.
Answer: D

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NO.7 For a MapReduce job, on a cluster running MapReduce v1 (MRv1), what's the relationship
between tasks and task templates?
A. There are always at least as many task attempts as there are tasks.
B. There are always at most as many tasks attempts as there are tasks.
C. There are always exactly as many task attempts as there are tasks.
D. The developer sets the number of task attempts on job submission.
Answer: A

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