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

Question : You need to insert a cell with a specific timestamp (version) . Which of the following is true?


1. The timestamp for the entire row must be updated to 13353903160532
2. The Put class allows setting a cell specific timestamp
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4. The HTable class allows you to temporarily roll back the newer versions of the cell



Correct Answer : 2

Doing a put always creates a new version of a cell, at a certain timestamp. By default the system uses the
server's currentTimeMillis, but you can specify the version (= the long integer) yourself, on a per-column level.
This means you could assign a time in the past or the future, or use the long value for non-time purposes.
To overwrite an existing value, do a put at exactly the same row, column, and version as that of the cell you
would overshadow.





Question : Select the correct statement

1. .META table holds the list of all user space region
2. Entries in .META tables are keyed by region name
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4. Region name is made up of first raw values of that region



1. 1,2,4
2. 1,2,3
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4. 1,2,3,4




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Question : Region name is made up of



1. Table name
2. Region Start row
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4. MD5 hash of table name, start row and creation timestamp
5. ALL of the above



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Related Questions

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Question :

Select the wrong point about the In Memory ColumnFamilies


1. ColumnFamilies can be defined as in-memory
2. Data is still persisted to disk
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4. Not guaranteed that the entire table will be in memory
5. None of the above




Question :

Select the correct statement for the Time to Live (TTL) for column family



1. ColumnFamilies can set a TTL length in seconds
2. Rows will automatically delete when expiration time is reached
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4. Used in conjunction with minimum versions setting
5. All of the above





Question :

While designoing the row key which of the following is correctly applies..


1. Rowkeys cannot be changed
2. Rows are sorted on insert not on scan
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4. All 1,2 and 3 are applies
5. Only 1 and 2 applies





Question :

While inserting the data to HBase using Put


1. True
2. False





Question : Can we have following architecture in MapR-DB as shown in image with its description :

Description : the diagram below depicts a MapR cluster storing table and file data.
The cluster has three separate volumes mounted at directories /user/john, /user/dave,
and /project/ads. As shown, each directory contains both file data and table data, grouped
together logically. Because each of these directories maps to a different volume, data in
each directory can have different policy. For example, /user/john has a disk-usage quota,
while /user/dave is on a snapshot schedule. Furthermore, two directories, /user/john and
/project/ads are mirrored to locations outside the cluster, providing read-only access
to high-traffic data, including the tables in those volumes


1. Yes
2. No
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4. It depends on cluster size
5. There must be at least 100 nodes cluster
p2_q33.png




Question : Having different architecture of MapR-DB compare to HBase has, which of the following advantages

A. Rollback from errors
B. Hot backups
C. Model training
D. Managing real-time data analysis



1. A,B,C
2. B,C,D
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4. A,B,C,D
5. A,C,E