HBase Online Quiz


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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

Q 1 - There are 2 programs which confirm a write into Hbase. One is write-ahead log(WAL) and the other one is

A - Mem confirm log

B - Write complete log

C - log store

D - Memstore

Answer : D

Explanation

The write access log and Memstore confirm the writing of a Hbase value.

Q 2 - A record deleted in Hbase is not removed from Hbase immediately. Instead it is written to another file and marked as Delete. Such a file is Known as

A - DFile

B - Tombfile

C - Tombstone

D - Earmark

Answer : C

Explanation

The deleted records are stored in file is known as Tombstone.

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 : B

Explanation

The toe predefined namespace in Hbase are – habse and default. Habse contains internal tables and default contains the tables which are not qualified with any namespace.

Answer : B

Explanation

The command keeps a minimum of 2 versions of all columns in column family f1.

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.

Answer : D

Explanation

The column qualifier can be left empty and still written to and read from. ALos it can not be renamed after it is created

Answer : D

Explanation

The Regionservers slaves are managed by the Hbase Master node

hbase_questions_answers.htm
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