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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 - There are 2 programs which confirm a write into Hbase. One is write-ahead log(WAL) and the other one is
Answer : D
Explanation
The write access log and Memstore confirm the writing of a Hbase value.
Q 2 - The verison information of a record in a KeyValue instance is inspected using the method
Answer : B
Explanation
The getTimestamp() method is used to inspect the specific verison associated with a KeyValue Instance.
Q 3 - The values stored inside a cell which is identified using a rowkey, column family and column qualifier is stored as
Answer : A
Explanation
The data stored inside a cell is always in Byte format.
Q 4 - The two tables which are used to find where regions of various tables are hosted are
Answer : C
Explanation
The –ROOT_ and >META> table hold the data to find the location of regions.
Q 5 - In a Map-Side join, we take rows from one table and map it with rows from the other table. The size of one of the table should be
B - Half the size of the other table
Answer : A
Explanation
If you join two datasets where at least one of them can fit in memory of the map task,then load the smaller dataset into a hash-table so the map tasks can access it while iterating over the other dataset. In these cases, you can skip the Shuffle and Reduce Steps entirely and emit your final
output from the Map Step.
Q 6 - The two predefined namespace in Hbase are
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.
Q 7 - When a large amount of client requests are directed to a very few nodes in a cluster, it is known as
Answer : C
Explanation
many client requests landing in only a few nodes is called Hotspotting.
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 - 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 - The exported data using the inbuilt export utility from Hbase table is in which file format
Answer : C
Explanation
The data exported from Hbase table using the inbuilt export utility is in sequence file format.
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