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

2. You have user profile records in your OLPT database, that you want to join with web logs you have already ingested into the Hadoop file system. How will you obtain these user records?

A) Hive LOAD DATA command
B) Ingest with Flume agents
C) HDFS command
D) Sqoop import
E) Pig LOAD command
F) Ingest with Hadoop Streaming

3. You have written a Mapper which invokes the following five calls to the OutputColletor.collect method:
output.collect (new Text ("Apple"), new Text ("Red") ) ;
output.collect (new Text ("Banana"), new Text ("Yellow") ) ;
output.collect (new Text ("Apple"), new Text ("Yellow") ) ;
output.collect (new Text ("Cherry"), new Text ("Red") ) ;
output.collect (new Text ("Apple"), new Text ("Green") ) ;
How many times will the Reducer's reduce method be invoked?

A) 6
B) 1
C) 5
D) 0
E) 3

4. MapReduce v2 (MRv2/YARN) splits which major functions of the JobTracker into separate daemons? Select two.

A) Resource management
B) Job scheduling/monitoring
C) Managing file system metadata
D) MapReduce metric reporting
E) Heath states checks (heartbeats)
F) Job coordination between the ResourceManager and NodeManager
G) Launching tasks
H) Managing tasks

5. You have a directory named jobdata in HDFS that contains four files: _first.txt, second.txt, .third.txt and #data.txt. How many files will be processed by the FileInputFormat.setInputPaths () command when it's given a path object representing this directory?

A) None, the directory cannot be named jobdata
B) Two, file names with a leading period or underscore are ignored
C) One, no special characters can prefix the name of an input file
D) Four, all files will be processed
E) Three, the pound sign is an invalid character for HDFS file names

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