Cloudera HBase Certification Questions and Answers (Dumps and Practice Questions)

Question : _____________ Automatically moves regions around to balance cluster load


1. Regions
2. HMaster
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4. ZooKeeper
5. Load Balancer


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Question : Data is distributed across Regions based on _______________

1. Column Family
2. Regions
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4. Load

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Question : select the correct statement

1. Region Size basic element of availability and distribution
2. High Region count (e.g., more than 3000) can impact performance
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4. 1 ,2 and 3 are not correct
5. All 1,2 and 3 are correct

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Related Questions

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Question :

Given the following HBase dataset, which is labeled with row numbers. . .

1 BB002 Column=Comments:C_Author,timestamp=001,value=Diana Mears
2 BB002 Column=Comments:C_Title,timestamp=001,value=Thanks
3 BB001 Column=INFO:Title,timestamp=005,value=HBase+Hadoop
4 BB001 Column=INFO:Author,timestamp=005,value=Larse George
5 BB002 Column=Comments:C_Text,timestamp=001,value=Any tips on...
3 BB001 Column=INFO:Text,timestamp=005,value=Some of the...

Which of the following lists of row numbers is the correct order that HBase would store this data?


1. 1, 5, 2, 4, 3, 6
2. 4, 1, 2, 6, 3, 5
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4. 3, 4, 6, 1, 2, 5




Question :

You have a table with 5 TB of data, 10 RegionServers, and a region size of 256MB. You want to continue with
puts to widely disbursed row ids in your table. Which of the following will improve write performance?

1. Increase your buffer cache in the RegionServers
2. Increase the number of RegionServers to 15
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4. Decrease your region size to 128MB





Question :

From within an HBase application, you would like to create a new table named weblogs. You have started with
the following Java code:
HBaseAdmin admin = new HBaseAdmin (conf);
HTableDescriptor t = new HTableDescriptor("weblogs");
Which of the following method(s) would you use next?


1. admin.createTable(t);admin.enable.Table(t);
2. admin.createTable(t);
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4. HTable.createTable(t);





Question :

You want to do mostly full table scans on your data. In order to improve performance you increase your block
size. Why does this improve your scan performance?


1. It does not. Increasing block size does not improve scan performance.
2. It does not. Increasing block size means that fewer blocks fit into your block cache. This requires HBase to
read each block from disk rather than cache for each scan, thereby decreasing scan performance.
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4. Increasing block size means fewer block indexes that need to be read from disk, thereby increasing scan performance.





Question :

Your client application connects to HBase for the first time and queries the .META. table. What information
does the .META. table provide to your client application?


1. The location of a Region
2. The location of an MMaster
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4. The location of a ROOT table





Question :

You have a table where keys range from "A" to "Z", and you want to scan from "D" to "H." Which of the
following is true?


1. A MultiGet must be issued for rows D, E, F, G, H.
2. The scan class supports ranges via the stop and start rows.
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4. In order to range scan, raw scan mode must be enabled.