HDPCD 試験問題を無料オンラインアクセス

You want to Ingest log files Into HDFS, which tool would you use?

• A.Flume
• B.Ambari
• C.Sqoop
• D.HCatalog

What does Pig provide to the overall Hadoop solution?

• A.Simple scripting language for writing MapReduce programs
• B.Database table and storage management services
• C.C++ interface to MapReduce and data warehouse infrastructure
• D.Legacy language Integration with MapReduce framework

Given the following Pig command:
logevents = LOAD 'input/my.log' AS (date:chararray, levehstring, code:int, message:string);
Which one of the following statements is true?

• A.The statement is not a valid Pig command
• B.The logevents relation represents the data from the my.log file, using a comma as the parsing delimiter
• C.The logevents relation represents the data from the my.log file, using a tab as the parsing delimiter
• D.The first field of logevents must be a properly-formatted date string or table return an error

Consider the following two relations, A and B.

Which Pig statement combines A by its first field and B by its second field?

• A.C = JOIN A SO, B $1;
• B.C = DOIN B BY a1, A by b2;
• C.C = JOIN A a1, B b2;
• D.C = JOIN A by al, B by b2;

You want to count the number of occurrences for each unique word in the supplied input data. You've decided to implement this by having your mapper tokenize each word and emit a literal value 1, and then have your reducer increment a counter for each literal 1 it receives. After successful implementing this, it occurs to you that you could optimize this by specifying a combiner. Will you be able to reuse your existing Reduces as your combiner in this case and why or why not?

• A.Yes, because Java is a polymorphic object-oriented language and thus reducer code can be reused as a combiner.
• B.No, because the Reducer and Combiner are separate interfaces.
• C.Yes, because the sum operation is both associative and commutative and the input and output types to the reduce method match.
• D.No, because the sum operation in the reducer is incompatible with the operation of a Combiner.
• E.No, because the Combiner is incompatible with a mapper which doesn't use the same data type for both the key and value.