Hadoop Online Quiz

Q 1 - Which of these provides a Stream processing system used in Hadoop ecosystem?

A - Solr

B - Tez

C - Spark

D - Hive

Q 2 - For the frequently accessed HDFS files the blocks are cached in

A - the memory of the datanode

B - in the memory of the namenode

C - Both A&B

D - In the memory of the client application which requested the access to these files.

Q 3 - Which of the following is not a fencing mechanism for a previously active namenode?

A - Disabling its network port via a remote management command.

B - Revoking its access to shared storage directory.

C - Formatting its disk drive.

D - STONITH

Q 4 - The command to check if Hadoop is up and running is −

A - Jsp

B - Jps

C - Hadoop fs –test

D - None

Q 5 - The output of a mapper task is

A - The Key-value pair of all the records of the dataset.

B - The Key-value pair of all the records from the input split processed by the mapper

C - Only the sorted Keys from the input split

D - The number of rows processed by the mapper task.

Q 6 - When a file in HDFS is deleted by a user

A - it is lost forever

B - It goes to trash if configured.

C - It becomes hidden from the user but stays in the file system

D - File sin HDFS cannot be deleted

Q 7 - The archive file created in Hadoop always has the extension of

A - .hrc

B - .har

C - .hrh

D - .hrar

Q 8 - You can reserve the amount of disk usage in a data node by configuring the dfs.datanode.du.reserved in which of the following file

A - Hdfs-site.xml

B - Hdfs-defaukt.xml

C - Core-site.xml

D - Mapred-site.xml

Q 9 - What is AVRO?

A - Avro is a java serialization library.

B - Avro is a java compression library.

C - Avro is a java library that create split table files.

D - None of these answers are correct.

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.