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Hortonworks Hadoop 2.0 Certification exam for Pig and Hive Developer Sample Questions:

1. Given the following Pig commands:

Which one of the following statements is true?

A) The severe relation is not valid
B) The $1 variable represents the first column of data in 'my.log'
C) The $1 variable represents the second column of data in 'my.log'
D) The grouped relation is not valid

2. 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) Make a directory /foo/bar
D) List a directory /foo

3. Analyze each scenario below and indentify which best describes the behavior of the default partitioner?

A) The default partitioner assigns key-values pairs to reduces based on an internal random number generator.
B) 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.
C) 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.
D) 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.
E) 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.

4. Which one of the following statements describes a Hive user-defined aggregate function?

A) Operates on multiple input rows and creates a single row as output
B) Operates on multiple input rows and produces a table as output
C) Operates on a single input row and produces a single row as output
D) Operates on a single input row and produces a table as output

5. Assuming default settings, which best describes the order of data provided to a reducer's reduce method:

A) The keys given to a reducer are in sorted order but the values associated with each key are in no predictable order
B) Neither keys nor values are in any predictable order.
C) Both the keys and values passed to a reducer always appear in sorted order.
D) The keys given to a reducer aren't in a predictable order, but the values associated with those keys always are.

Solutions: