Cloudera HBase 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 correct statement for the Put operation

1. It is used to add a row to a table
2. It Takes the row key as a byte array
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4. Only 3 correct
5. All 1,2 and 3 are correct




Question :

While adding multiple data using Batch data into a single put, which of the following staement is wrong


1. Concurrent readers will not see partially written rows
2. Concurrent writers will not update the same row
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4. 1 and 2 are wrong
5. None of 1,2 and 3 is wrong






Question : Select the correct mapping

A setAutoFlush(boolean)
B flushCommits()

X. Buffers the put operations
Y. Executes all buffered operations
Z. Buffer is automatically flushed when it becomes full


1. X and Y applies to A
2. Y and Z applies to B
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4. X,Y and Z all applies to A
5. X,Y and Z all applies to B





Question : Select the correct statement for the WAL


1. Disable the write-ahead log for faster writes
2. If a server crashes, edits will be lost in case of WAL is disabled
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4. All of the above




Question :Scan operation is used to scan all the rows in a table


1. True
2. False




Question :What is HBASE?

1. Hbase is separate set of the Java API for Hadoop cluster
2. Hbase is a part of the Apache Hadoop project that provides interface for scanning large amount of data using Hadoop infrastructure
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4. HBase is a part of the Apache Hadoop project that provides a SQL like interface for data processing.