Hortonworks HADOOP-PR000007 問題集

質問 1：
Which project gives you a distributed, Scalable, data store that allows you random, realtime read/write
access to hundreds of terabytes of data?
A. Flume
B. Pig
C. Sqoop
D. Hue
E. Oozie
F. Hive
G. HBase
正解：G

質問 2：
To process input key-value pairs, your mapper needs to lead a 512 MB data file in memory. What is the
best way to accomplish this?
A. Place the data file in the DistributedCache and read the data into memory in the configure method of
the mapper.
B. Place the data file in the DataCache and read the data into memory in the configure method of the
mapper.
C. Serialize the data file, insert in it the JobConf object, and read the data into memory in the configure
method of the mapper.
D. Place the data file in the DistributedCache and read the data into memory in the map method of the
mapper.
正解：B

質問 3：
Which one of the following files is required in every Oozie Workflow application?
A. job.properties
B. Config-default.xml
C. Workflow.xml
D. Oozie.xml
正解：C

質問 4：
What does Pig provide to the overall Hadoop solution?
A. Database table and storage management services
B. Simple scripting language for writing MapReduce programs
C. C++ interface to MapReduce and data warehouse infrastructure
D. Legacy language Integration with MapReduce framework
正解：B

質問 5：
Which one of the following statements regarding the components of YARN is FALSE?
A. A client application submits a YARW job to the ResourceManager
B. The ResourceManager is responsible for scheduling and allocating resources
C. The ResourceManager monitors and restarts any failed Containers
D. A Container executes a specific task as assigned by the ApplicationMaster
正解：C

質問 6：
Analyze each scenario below and indentify which best describes the behavior of the default partitioner?
A. The default partitioner computes the hash of the key and divides that valule modulo the number of
reducers. The result determines the reducer assigned to process the key-value pair.
B. The default partitioner computes the hash of the value and takes the mod of that value with the number
of reducers. The result determines the reducer assigned to process the key-value pair.
C. The default partitioner computes the hash of the key. Hash values between specific ranges are
associated with different buckets, and each bucket is assigned to a specific reducer.
D. The default partitioner assigns key-values pairs to reduces based on an internal random number
generator.
E. The default partitioner implements a round-robin strategy, shuffling the key-value pairs to each reducer
in turn. This ensures an event partition of the key space.
正解：A

質問 7：
You use the hadoop fs -put command to write a 300 MB file using and HDFS block size of 64 MB. Just
after this command has finished writing 200 MB of this file, what would another user see when trying to
access this life?
A. They would see the current state of the file, up to the last bit written by the command.
B. They would see the current of the file through the last completed block.
C. They would see no content until the whole file written and closed.
D. They would see Hadoop throw an ConcurrentFileAccessException when they try to access this file.
正解：B