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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 - When a compaction operates over all HFiles in a column family in a given region, it is called
Answer : A
Explanation
IN a Major compaction all the HFIles of a column family for a given region are acted upon.
Q 3 - A scan returns bulk of rows. But only a selected few rows can be fetched form a scan using a
Answer : D
Explanation
The filer clause is used to retrun only a specific set of records and not the entire result of the scan.
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 - The number of namespaces, HDFS provides to the regionservers of a Hbase database is
A - Equal to number of regionserver
B - Half of the number of regionserver
Answer : D
Explanation
HDFS provides a single namespace to all the RegionServers,and any of them can access the persisted files from any other Regionserver.
Q 6 - If we choose the rowkey to be a timestamp then inserting data to such a Hbase table will be
A - Faster than a numeric rowkey data
B - Slower than a numeric rowkey data
Answer : B
Explanation
If the rowkey is made as timestamp then it will always be written to a specific region and at the end of the table, overloading just one machine holding that region. SO it will be slower than other type of rowkey.
Q 7 - Hbase can automatically delete rows by using
Answer : C
Explanation
Using TTL Hbase will delte all the rows that has reached the expiration time.
Q 8 - The type of coprocessors which are similar to the stored procedures in relational database is
Answer : D
Explanation
The Endpoint type of coprocessor is similar to the data abse store dprocedure in relational systems.
Q 9 - The Hbase column qualifier in a column can be
B - Written to and read form when omitted
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
Q 10 - The Hbase master node orchestrates
Answer : D
Explanation
The Regionservers slaves are managed by the Hbase Master node
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