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

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

2. Examine the following Hive statements:

Assuming the statements above execute successfully, which one of the following statements is true?

A) The file named File1 is moved to to/user/joe/x/
B) The contents of File1 are parsed as comma-delimited rows and stored in a database
C) Hive reformats File1 into a structure that Hive can access and moves into to/user/joe/x/
D) The contents of File1 are parsed as comma-delimited rows and loaded into /user/joe/x/

3. Given the following Hive command:
INSERT OVERWRITE TABLE mytable SELECT * FROM myothertable;
Which one of the following statements is true?

A) The contents of myothertable are appended to mytable
B) A new table named mytable is created, and the contents of myothertable are copied into mytable
C) The statement is not a valid Hive command
D) Any existing data in mytable will be overwritten

4. You write MapReduce job to process 100 files in HDFS. Your MapReduce algorithm uses
TextInputFormat: the mapper applies a regular expression over input values and emits key-values pairs
with the key consisting of the matching text, and the value containing the filename and byte offset.
Determine the difference between setting the number of reduces to one and settings the number of
reducers to zero.

A) With zero reducers, all instances of matching patterns are gathered together in one file on HDFS. With
one reducer, instances of matching patterns are stored in multiple files on HDFS.
B) With zero reducers, no reducer runs and the job throws an exception. With one reducer, instances of
matching patterns are stored in a single file on HDFS.
C) With zero reducers, instances of matching patterns are stored in multiple files on HDFS. With one
reducer, all instances of matching patterns are gathered together in one file on HDFS.
D) There is no difference in output between the two settings.

5. Which HDFS command copies an HDFS file named foo to the local filesystem as localFoo?

A) hadoop fs -Is foo
B) hadoop fs -put foo LocalFoo
C) hadoop -cp foo LocalFoo
D) hadoop fs -get foo LocalFoo

Solutions: