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Hortonworks-Certified-Apache-Hadoop-2.0-Developer(Pig and Hive Developer) Sample Questions:

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

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

2. On a cluster running MapReduce v1 (MRv1), a TaskTracker heartbeats into the JobTracker on your
cluster, and alerts the JobTracker it has an open map task slot.
What determines how the JobTracker assigns each map task to a TaskTracker?

A) The amount of RAM installed on the TaskTracker node.
B) The number and speed of CPU cores on the TaskTracker node.
C) The amount of free disk space on the TaskTracker node.
D) The location of the InsputSplit to be processed in relation to the location of the node.
E) The average system load on the TaskTracker node over the past fifteen (15) minutes.

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

A) 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.
B) The default partitioner assigns key-values pairs to reduces based on an internal random number
generator.
C) 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.
D) 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.
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. What does the following WebHDFS command do?
Curl -1 -L "http://host:port/webhdfs/v1/foo/bar?op=OPEN"

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

5. Which HDFS command uploads a local file X into an existing HDFS directory Y?

A) hadoop fs -localPut X Y
B) hadoop fs -get X Y
C) hadoop scp X Y
D) hadoop fs-put X Y

Solutions: