Hadoop Interview Questions
Questions Answers Views Company eMail

What is MapReduce?

435

What MapReduce framework consists of?

426

Can we submit the mapreduce job from slave node?

493




How can we control particular key should go in a specific reducer?

302

How can you add the arbitrary key-value pairs in your mapper?

438

What is Reduce only jobs?

269

What is a IdentityMapper and IdentityReducer in MapReduce ?

285

Explain Working of MapReduce?

314

Write a Mapreduce Program for Character Count ?

379

how to proceed to write your first mapreducer program?

695

How to set the number of reducers?

615

Developing a MapReduce Application?

293

Different ways of debugging a job in MapReduce?

444

Explain the Reducer's reduce phase?

337

Why do we use HDFS for applications having large data sets and not when there are lot of small files?

1 971







Un-Answered Questions { Hadoop }

What do the master class and the output class do?

27


Name different types of the data model?

5


Which command is used to show the current hbase user?

9


What are the components of Pig Execution Environment?

39


On which port does ssh work?

50






Can I use impala to query data already loaded into hive and hbase?

7


how can you debug Hadoop code?

166


What do you mean by the high availability of a namenode?

1


Can we change Replication Factor on a live cluster?

5


How to enable recycle bin or trash in hadoop?

60


What are the independent extensions that are contributed to the ambari codebase?

7


Define Mem-table in Cassandra?

7


Explain Dsstream with reference to Apache Spark

7


What is the difference between apache mahout and spark mllib ?

1


For a Hadoop job, how will you write a custom partitioner?

25