Hadoop Online Quiz

Q 1 - A file in HDFS that is smaller than a single block size

A - Cannot be stored in HDFS.

B - Occupies the full block's size.

C - Occupies only the size it needs and not the full block.

D - Can span over multiple blocks.

Q 2 - When a client communicates with the HDFS file system, it needs to communicate with

A - only the namenode

B - only the data node

C - both the namenode and datanode

D - None of these

Q 3 - When running on a pseudo distributed mode the replication factor is set to

A - 2

B - 1

C - 0

D - 3

Q 4 - The hdfs command to create the copy of a file from a local system is

A - CopyFromLocal

B - copyfromlocal

C - CopyLocal

D - copyFromLocal

Q 5 - In the secondary namenode the amount of memory needed is

A - Similar to that of primary node

B - Should be at least half of the primary node

C - Must be double of that of primary node

D - Depends only on the number of data nodes it is going to handle

Q 6 - The command “hadoop fs -test -z URI “ gives the result 0 if

A - if the path is a directory

B - if the path is a file

C - if the path is not empty

D - if the file is zero length

Q 7 - In HDFS the files cannot be

A - read

B - deleted

C - executed

D - Archived

Q 8 - Job tracker runs on

A - Namenode

B - Datanode

C - Secondary namenode

D - Secondary datanode

Q 9 - Can you run Map - Reduce jobs directly on Avro data?

A - Yes, Avro was specifically designed for data processing via Map-Reduce.

B - Yes, but additional extensive coding is required.

C - No, Avro was specifically designed for data storage only.

D - Avro specifies metadata that allows easier data access. This data cannot be used as part of map-reduce execution, rather input specification only.

Q 10 - Which of the following is false about RawComparator ?

A - Compare the keys by byte.

B - Performance can be improved in sort and suffle phase by using RawComparator.

C - Intermediary keys are deserialized to perform a comparison.