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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 - What is the number of MemStore per column family
Answer : A
Explanation
There is only one Memstore per column family
Q 2 - While reading data from Hbase the command used to get only a specific column instead of all the columns in a column family is
Answer : A
Explanation
The addcolumn() command displays result for specific column given as a input to this command rather than all the columns in a table, which is the default behavior.
Q 3 - The method which deletes a specific version within a cell is
Answer : B
Explanation
The deletecolumn() deletes a specific version but deletecolumns() deletes all the versions in a cell prior to the specified version.
Q 4 - The size of a individual region is governed by the parameter
Answer : C
Explanation
The parameter Hbase.region.max.filesize is present in hbase-site.xml and it is configured to decide the size of the region.
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 - In the standalone mode Hbase runs on
Answer : A
Explanation
In standalone mode Hbase runs only on the local file system.
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 - 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 - 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 Hbase there are two situations when the WAL logfiles needs to be replayed. One is when the server fails. The other is when
Answer : C
Explanation
The only two instances when the logs are replayed is when cluster starts or the server fails.
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