Cloudera Hadoop Developer Certification Questions and Answer (Dumps and Practice Questions)

Question : In HBase, lookup of a row is done by single key only?

1. True
2. False



Correct Answer : 1


Explanation: In HBase Table row keys are also byte arrays so almost anything can
serve as a row key from strings to binary representations of longs
or even serialized data structures. Rows in HBase tables are sorted by row key.
The sort is byte-ordered.
All table accesses are via the table row key : its primary key.

Refer HadoopExam.com Recorded Training Module : 18








Question : Hbase supports the transaction for single row ?

1. True
2. False



Correct Answer : 1

Apache HBase : HBase is the Hadoop database
- A NoSQL datastore
- Can store massive amounts of data
- Gigabytes, terabytes, and even petabytes of data in a table
- Scales to provide very high write throughput
- Hundreds of thousands of inserts per second
- Copes well with sparse data
- Tables can have many thousands of columns
- Even if most columns are empty for any given row
- Has a very constrained access model
- Insert a row, retrieve a row, do a full or partial table scan
- Only one column (the row key ) is indexed
- Does not support multi row transaction but single row transactions are supported

Refer HadoopExam.com Recorded Training Module : 18





Question : Which are the supported method to access the data from HBase


1. get
2. put
3. scan
4. 1,2 and 3 are correct
5. It has to be accessed by Query only

Correct Answer : 4

There are four primary data model operations available in HBase Get, Put, Scan, and Delete

Get : returns attributes for a specified row
Put : either adds new rows to a table (if the key is new) or can update existing rows (if the key already exists).
Scan : scan allow iteration over multiple rows for specified attributes
Delete : removes a row from a table

Refer HadoopExam.com Recorded Training Module : 18

Related Questions

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Question :


1. 1
2. 2
3. Access Mostly Uused Products by 50000+ Subscribers
4. 4


Question :

Which of the following are the feature of the Apache Hadoop

1. Data Integration
2. Data Processing
3. Access Mostly Uused Products by 50000+ Subscribers
4. All of the above


Question : What are the feature of the Hadoop Framework

1. Nodes talks to each other as little as possible
2. Computation happens where the data is stored
3. Access Mostly Uused Products by 50000+ Subscribers
4. All of the above


Question :

MapTask works at a time....


1. Multiple data blocks
2. Single Blocks
3. Access Mostly Uused Products by 50000+ Subscribers
4. All of the above


Question :

What happens when a running task fails in the hadoop...

1. Failed task data will be lost
2. the master will detect that failure and re-assign the work to a different node on the system
3. Access Mostly Uused Products by 50000+ Subscribers
4. 2 and 3 both are correct


Question :

If a node appears to be running slowly then .....

1. the master can redundantly execute another instance of the same task
2. Result from the first to finish will be used
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4. 1 and 2 are correct