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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 - The Value that is unique across all the rows in Hbase table is
Answer : D
Explanation
Rowkey is the value which is the unique values across all the rows.
Q 2 - Each version of data within a cell adds a versioning information through a
Answer : B
Explanation
Each version of data within a cell contributes one KeyValue instance to the Result.
Q 3 - Retrieving a batch of rows in every RPC call made by an API to a HBase database is called a
Answer : B
Explanation
When a group of records is returned from HBASE database by an API making a RPC call the process is called a scan. The number of rows to be returned by configuring the caching property.
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 - While writing to Hbase using the Mapreduce tasks, each reduce tasks writes to
Answer : C
Explanation
The writes go to the region that is responsible for the rowkey that is being written by the reduce task.
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 - The rowkeys in Hbase are immutable. The only way they can be changed is
B - Updating them at a pre-defined interval
Answer : D
Explanation
The row key gets removed when a row is deleted and a new one is created when a row is inserted.
Q 8 - Which filter accepts chance as a parameter?
Answer : B
Explanation
The Random filter which returns a random row uses the chance parameter. Example- RandomRowFilter(float chance)
Q 9 - What is part of the directory name where Hbase data is stored?
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 - To see all the tables presen tin a user space in Hbase the command used is
Answer : B
Explanation
The list command displays all the tables present in the user space in Hbase
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