HBase Online Quiz



Following quiz provides Multiple Choice Questions (MCQs) related to HBase. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Questions and Answers

Answer : B

Explanation

A single HF file can be associated with only one column family.

Q 2 - While reading from Hbase the sequence in which the read happens is

A - MemCache,Blockcache,HFile

B - Blockcache,HFile,Memcache

C - MemCache,HFile,Blockcache

D - HFile,Memcache,Blockcache

Answer : A

Explanation

The order is first read the Memcache, then the Blockcache and finally the HFile.

Answer : D

Explanation

Every row in a table has the same column families, although a row need not store data in all its families.

Q 4 - Servers that host regions of a Hbase table are called

A - RegionServers

B - Regional servers

C - Hbase Servers

D - Splitservers

Answer : A

Explanation

The Regionservers are the servers which hold the regions of a Hbase table.

Answer : A

Explanation

Reduce-side joins require shuffling and sorting data between map and reduce tasks.

This incurs I/O costs.

Answer : A

Explanation

The tuple row, column and version defines a cell. Here row indicates the rowkey.

Q 7 - How many types of delete markers are used by Hbase for deleting columns?

A - 2

B - 3

C - 4

D - 1

Answer : B

Explanation

The three different types of column deletes in Hbase are

Delete − for a specific version of a column.

Delete column: for all versions of a column.

Delete family − for all columns of a particular ColumnFamily

Q 8 - A coprocessor is executed when an event occurs. This type of coprocessor is known as

A - Observer

B - Listener

C - Master

D - Event handler

Answer : A

Explanation

The observer type of coprocessor is executed when an event occurs.

Q 9 - What is part of the directory name where Hbase data is stored?

A - Table name

B - Column qualifier

C - Column family

D - HFile

Answer : C

Explanation

The column family is part of the directory name where the Hbase data is stored. It must be made up of printable characters.

Q 10 - Before the edits in a HBAse logfile can be replayed they are separated into one logfile per region.

It is called −

A - Log splitting

B - Region splitting

C - WAL splitting

D - Replay splitting

Answer : A

Explanation

The separation of log file into one log per region is called log splitting.

hbase_questions_answers.htm
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