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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 - At the end of a major compaction the number of HFiles of a Hbase table is
A - Equal to number of column families
Answer : A
Explanation
At the end of major compaction one column family gets one HFile.
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 - 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 - 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 - In the standalone mode Hbase runs on
Answer : A
Explanation
In standalone mode Hbase runs only on the local file system.
Q 7 - The schema level changes to table or column families(like region size, block size etc) are reflected
A - Immediately after the changes
B - Only after a major compaction
Answer : B
Explanation
Only after a major compaction and the StoreFiles get re-written the schema level changes are available.
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 - If one single column family exceeds the maximum file size specified by Hbase configuration then
A - Data load error is encountered
B - The column family is dropped
Answer : D
Explanation
Once the max file size is reached, the region is split into two.
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.