How to configure the number of the Combiner in MapReduce?

464

How many times combiner is called on a mapper node in Hadoop?

483

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

1230

Where the mapper's intermediate data will be stored?

465

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

479

What is heartbeat in hdfs? Explain.

486

What are mapreduce new and old apis while writing map reduce program?. Explain how it works

459

Explain how mapreduce works.

439

If reducers do not start before all mappers finish then why does the progress on mapreduce job shows something like map(50%) reduce(10%)? Why reducers progress percentage is displayed when mapper is not finished yet?

545

Difference between mapreduce and spark

505

Explain what is distributed cache in mapreduce framework?

448

What is the problem with the small file in Hadoop?

476

how can you debug Hadoop code?

623

Can we rename the output file?

479

What do you mean by data locality?

474