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Question ID 12509	You use the hadoop fs put command to write a 300 MB file using and HDFS block size of 64 MB. Just after this command has finished writing 200 MB of this file, what would another user see when trying to access this life?
Option A	They would see Hadoop throw an ConcurrentFileAccessException when they try to access this file.
Option B	They would see the current state of the file, up to the last bit written by the command.
Option C	They would see the current of the file through the last completed block.
Option D	They would see no content until the whole file written and closed.
Correct Answer	C

Explanation

Question ID 12510	You have a directory named jobdata in HDFS that contains four files: _first.txt, second.txt, .third.txt and #data.txt. How many files will be processed by the FileInputFormat.setInputPaths () command when it's given a path object representing this directory?
Option A	Four, all files will be processed
Option B	Three, the pound sign is an invalid character for HDFS file names
Option C	Two, file names with a leading period or underscore are ignored
Option D	None, the directory cannot be named jobdata
Option E	One, no special characters can prefix the name of an input file
Correct Answer	C

Explanation Explanation: Files starting with '_' are considered 'hidden' like unix files starting with '.'. # characters are allowed in HDFS file names.

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