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. Serialize the data file, insert in it the JobConf object, and read the data into memory in the configure method of the mapper.
• C. Place the data file in the DataCache 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.

In a MapReduce job with 500 map tasks, how many map task attempts will there be?

• A. At least 500.
• B. It depends on the number of reduces in the job.
• C. Exactly 500.
• D. Between 500 and 1000.
• E. At most 500.

Review the following data and Pig code.
M,38,95111 F,29,95060 F,45,95192 M,62,95102 F,56,95102
A = LOAD 'data' USING PigStorage('.') as (gender:Chararray, age:int, zlp:chararray);
B = FOREACH A GENERATE age;
Which one of the following commands would save the results of B to a folder in hdfs named myoutput?

• A. STORE A INTO 'myoutput' USING PigStorage(',');
• B. STORE B INTO 'myoutput';
• C. DUMP B using PigStorage('myoutput');
• D. DUMP B INTO 'myoutput';

What does the following WebHDFS command do?
Curl -1 -L "http://host:port/webhdfs/v1/foo/bar?op=OPEN"

• A. Read a file /foo/bar
• B. Delete a directory /foo/bar
• C. List a directory /foo
• D. Make a directory /foo/bar

All keys used for intermediate output from mappers must:

• A. Be a subclass of FileInputFormat.
• B. Implement a splittable compression algorithm.
• C. Override isSplitable.
• D. Implement a comparator for speedy sorting.
• E. Implement WritableComparable.