Mapr (HP) HBase Developer Certification Questions and Answers (Dumps and Practice Questions)

Question :

For storing the data in HBase
Anything that can be converted to an array of bytes can be stored

1. True
2. False



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Bytes-in/bytes-out interface
Anything that can be converted to an array of bytes can be stored
- Input can be strings, numbers, complex objects, images, etc.







Question :
While storing the values in HBase, how cell size matters..



1. Cell Size, Practical limits to the size of values
2. In general, cell size should not consistently be above 10MB
3. Access Mostly Uused Products by 50000+ Subscribers
4. Both 1 and 2 are wrong

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While storing the data in HBase
Cell size
- Practical limits to the size of values
- In general, cell size should not consistently be above 10MB





Question :

For the large cell size in HBase


1. Increase the block size
2. Increase the maximum region size for the table
3. Access Mostly Uused Products by 50000+ Subscribers
4. All 1,2 and 3 are correct
5. Only 1 and 3 are correct



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Explanation: Cell size
- Practical limits to the size of values
- In general, cell size should not consistently be above 10MB
- For large cell size:
Increase the block size
Increase the maximum region size for the table
Keep the index size reasonable

Related Questions

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Question : Rows from the HBase can directly be inserted as input to Mapreduce job


1. True
2. False



Question : In which of the following scenerio we should use HBase

1. If it require random read, write or both
2. If it requires to do many thousands of operations per second on multiple TB of data
3. If access pattern is well known and simple
4. All of the above




Question : In which scenerio HBase should not be used


1. You only append to your dataset, and tend to read the whole thing
2. For ad-hoc analytics
3. If data volume is quite small
4. All of the above
5. None of the above



Question : Which is the correct statemnet to inserting the data in table

t1 and row key r1 and column family fam1


1. put 't1', 'r1', 'fam1:c1', 'value'
2. put 't1', 'r1', 'fam1:c1', 'value', 1274302629663
3. 1 and 2 are correct


Question : Which is the wrong syntex for scan


1. scan 't1'
2. scan 't1', {COLUMNS => 'fam1:c1'}
3. scan 't1', {COLUMNS => 'fam1:'}
4. scan 't1', {STARTROW => 'r1', LIMIT => 10}
5. scan 't1', {COLUMNS => ':c1'}



Question :

Which of the following is a wrong statement abount count

operation on HBase table

1. Syntex for count is count 'tablename' [, interval]
2. Counting the rows of a large table can be slow
3. The progress will be reported every interval
4. None of the 1,2 and 3
5. Only 1 and 2