what is a sequence file in Hadoop?

514

Explain about the basic parameters of mapper and reducer function

896

What is difference between an input split and hdfs block?

459

When is it not recommended to use MapReduce paradigm for large scale data processing?

497

With the help of two examples name the map and reduce function purpose

459

Is it mandatory to set input and output type/format in MapReduce?

549

What is the next step after Mapper or MapTask?

486

Explain what are the basic parameters of a mapper?

590

What is the Job interface in MapReduce framework?

729

Write a Mapreduce Program for Character Count ?

831

What happens when the node running the map task fails before the map output has been sent to the reducer?

492

what is "map" and what is "reducer" in Hadoop?

461

How would you tackle calculating the number of unique visitors for each hour by mining a huge apache log? You can use post processing on the output of the mapreduce job.

568

How to specify more than one directory as input in the Hadoop MapReduce Program?

543

What counter in Hadoop MapReduce?

472