Hortonworks-Certified-Apache-Hadoop-2.0-Developer(Pig and Hive Developer) 認定 HADOOP-PR000007 試験問題:

1. What types of algorithms are difficult to express in MapReduce v1 (MRv1)?

A) Large-scale graph algorithms that require one-step link traversal.
B) Relational operations on large amounts of structured and semi-structured data.
C) Text analysis algorithms on large collections of unstructured text (e.g, Web crawls).
D) Algorithms that require global, sharing states.
E) Algorithms that require applying the same mathematical function to large numbers of individual binary
records.

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

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

3. 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) Read a file /foo/bar
C) Delete a directory /foo/bar
D) List a directory /foo

4. In a MapReduce job, the reducer receives all values associated with same key. Which statement best
describes the ordering of these values?

A) The values are arbitrary ordered, but multiple runs of the same MapReduce job will always have the
same ordering.
B) Since the values come from mapper outputs, the reducers will receive contiguous sections of sorted
values.
C) The values are in sorted order.
D) The values are arbitrarily ordered, and the ordering may vary from run to run of the same MapReduce
job.

5. Which process describes the lifecycle of a Mapper?

A) The TaskTracker spawns a new Mapper to process each key-value pair.
B) The JobTracker spawns a new Mapper to process all records in a single file.
C) The TaskTracker spawns a new Mapper to process all records in a single input split.
D) The JobTracker calls the TaskTracker's configure () method, then its map () method and finally its close () method.

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