Cloudera Certified Developer for Apache Hadoop (CCDH) 認定 CCD-410 試験問題:

1. In a MapReduce job, you want each of your input files processed by a single map task. How do you configure a MapReduce job so that a single map task processes each input file regardless of how many blocks the input file occupies?

A) Increase the parameter that controls minimum split size in the job configuration.
B) Write a custom MapRunner that iterates over all key-value pairs in the entire file.
C) Write a custom FileInputFormat and override the method isSplitable to always return false.
D) Set the number of mappers equal to the number of input files you want to process.

2. Table metadata in Hive is:

A) Stored in the Metastore.
B) Stored as metadata on the NameNode.
C) Stored in ZooKeeper.
D) Stored along with the data in HDFS.

3. You are developing a MapReduce job for sales reporting. The mapper will process input keys representing the year (IntWritable) and input values representing product indentifies (Text).
Indentify what determines the data types used by the Mapper for a given job.

A) The key and value types specified in the JobConf.setMapInputKeyClass and JobConf.setMapInputValuesClass methods
B) The InputFormat used by the job determines the mapper's input key and value types.
C) The data types specified in HADOOP_MAP_DATATYPES environment variable
D) The mapper-specification.xml file submitted with the job determine the mapper's input key and value types.

4. Identify the MapReduce v2 (MRv2 / YARN) daemon responsible for launching application containers and monitoring application resource usage?

A) ApplicationMasterService
B) ResourceManager
C) JobTracker
D) TaskTracker
E) NodeManager
F) ApplicationMaster

5. Your client application submits a MapReduce job to your Hadoop cluster. Identify the Hadoop daemon on which the Hadoop framework will look for an available slot schedule a MapReduce operation.

A) JobTracker
B) TaskTracker
C) NameNode
D) DataNode
E) Secondary NameNode

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