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- HBase - Enabling a Table
- HBase - Describe & Alter
- HBase - Exists
- HBase - Drop a Table
- HBase - Shutting Down
- HBase - Client API
- HBase - Create Data
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- HBase - Read Data
- HBase - Delete Data
- HBase - Scan
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- HBase - Security
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.
Q 1 - Hbase is what type of database?
Answer : C
Explanation
Hbase is a schema less database as it stores data in column families which does not have a fixed or rigid structure to follow.
Q 2 - The deleted records in Hbase are stored in the file known as Tombstone. Then the space in freed only by truly removing these records from Hbase. This process is known as
Answer : A
Explanation
The process of merging tombstone files and creating a new HFile only containing the records not marked for delete is known as compaction.
Q 3 - Filters in Hbase can be applied to
Answer : D
Explanation
Filetrs can be applied to rowkeys,column qualifiers and data values.
Q 4 - A small chunk of data residing in one machine which is part of a cluster of machines holding one Hbase table is known as
Answer : B
Explanation
A region in Hbase table represents a small chunk of data which is part of a large Hbase table distributed across many servers.
Q 5 - Hbase stores data in
A - A single filesystem available to all RegionServers
B - As many filesystems as the number of regionServers
Answer : A
Explanation
HBase stores its data on a single file system. It assumes all the RegionServers have access to that file system across the entire cluster.
Q 6 - The property which enables a fully distributed mode for Hbase is
A - hbase-cluster.distributed-all
B - hbase-cluster.distributed-enable
Answer : D
Explanation
By default HBase runs in standalone mode. For a fully distributed configuration set the hbase-cluster.distributed property to true.
Q 7 - How many types of delete markers are used by Hbase for deleting columns?
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 - Which filer accepts the pagesize as a parameter?
Answer : C
Explanation
This filter gives the query result in different pages using Pagesize parameter.
Q 9 - The Hfile contains variable number of blocks. One fixed blocks in it is the block named file info block and the other one is
Answer : A
Explanation
in an Hfile only the file infor block and trailer blocks are fixed. All others are optional.
Q 10 - In which scenario nothing is written in the WAL on HBase?
Answer : D
Explanation
during the bulk load process nothing gets written to the WAL.