CCA-500試験無料問題集（60題）「Cloudera Certified Administrator for Apache Hadoop (CCAH) 認定」

出題：1

You have a Hadoop cluster HDFS, and a gateway machine external to the cluster from which clients submit jobs. What
do you need to do in order to run Impala on the cluster and submit jobs from the command line of the gateway
machine?

A. Install the impalad daemon and the impala shell on your gateway machine, and the statestored daemon and
catalogd daemon on one of the nodes in the cluster

B. Install the impalad daemon statestored daemon, and daemon on each machine in the cluster, and the impala shell
on your gateway machine

C. Install the impalad daemon, the statestored daemon, the catalogd daemon, and the impala shell on your gateway
machine

D. Install the impalad daemon on each machine in the cluster, the statestored daemon and catalogd daemon on one
machine in the cluster, and the impala shell on your gateway machine

E. Install the impalad daemon, statestored daemon, and catalogd daemon on each machine in the cluster and on the
gateway node

正解：E 解答を投票する

出題：2

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. 30

B. We cannot say; the number of mappers is determined by the ApplicationMaster

C. We cannot say; the number of Mappers is determined by the ResourceManager

D. 3

E. 10

F. We cannot say; the number of Mappers is determined by the developer

正解：E 解答を投票する

出題：3

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. Decrease the io.sort.mb value to 0

B. Increase the io.sort.mb to 1GB

C. 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.

D. For a 1GB child heap size an io.sort.mb of 128 MB will always maximize memory to disk I/O

正解：C 解答を投票する

出題：4

A user comes to you, complaining that when she attempts to submit a Hadoop job, it fails. There is a Directory in HDFS
named /data/input. The Jar is named j.jar, and the driver class is named DriverClass.
She runs the command:
Hadoop jar j.jar DriverClass /data/input/data/output
The error message returned includes the line:
PriviligedActionException as:training (auth:SIMPLE)
cause:org.apache.hadoop.mapreduce.lib.input.invalidInputException:
Input path does not exist: file:/data/input
What is the cause of the error?

A. The output directory already exists

B. The directory name is misspelled in HDFS

C. The name of the driver has been spelled incorrectly on the command line

D. The Hadoop configuration files on the client do not point to the cluster

E. The user is not authorized to run the job on the cluster

正解：E 解答を投票する

出題：5

You're upgrading a Hadoop cluster from HDFS and MapReduce version 1 (MRv1) to one running HDFS and MapReduce
version 2 (MRv2) on YARN. You want to set and enforce version 1 (MRv1) to one running HDFS and MapReduce
version 2 (MRv2) on YARN. You want to set and enforce a block size of 128MB for all new files written to the cluster
after upgrade. What should you do?

A. Set dfs.block.size to 134217728 on all the worker nodes, on all client machines, and on the NameNode, and set the
parameter to final

B. Set dfs.block.size to 128 M on all the worker nodes and client machines, and set the parameter to final. You do not
need to set this value on the NameNode

C. You cannot enforce this, since client code can always override this value

D. Set dfs.block.size to 134217728 on all the worker nodes and client machines, and set the parameter to final. You do
not need to set this value on the NameNode

E. Set dfs.block.size to 128M on all the worker nodes, on all client machines, and on the NameNode, and set the
parameter to final

正解：B 解答を投票する

出題：6

On a cluster running CDH 5.0 or above, you use the hadoop fs -put command to write a 300MB file into a previously
empty directory using an HDFS block size of 64 MB. Just after this command has finished writing 200 MB of this file,
what would another use see when they look in directory?

A. The directory will appear to be empty until the entire file write is completed on the cluster

B. They will see the file with a ._COPYING_ extension on its name. If they view the file, they will see contents of the
file up to the last completed block (as each 64MB block is written, that block becomes available)

C. They will see the file with its original name. If they attempt to view the file, they will get a
ConcurrentFileAccessException until the entire file write is completed on the cluster

D. They will see the file with a ._COPYING_ extension on its name. If they attempt to view the file, they will get a
ConcurrentFileAccessException until the entire file write is completed on the cluster

正解：C 解答を投票する

CCA-500試験無料問題集「Cloudera Certified Administrator for Apache Hadoop (CCAH) 認定」