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MapReduce Interview Questions
Questions Answers Views Company eMail

What are combiners? When should I use a combiner in my MapReduce Job?

354

In Map Reduce why map write output to Local Disk instead of HDFS?

380

What is a partitioner and how the user can control which key will go to which reducer?

362

How does Mappers run method works?

320

How does MapReduce framework view its input internally?

321

What are the steps involved in MapReduce framework?

348

What is the Job interface in MapReduce framework?

368

How to overwrite an existing output file during execution of mapreduce jobs?

MRO,

555

Detail description of the Reducer phases?

328

Can there be no Reducer?

302

What is the utility of using Writable Comparable Custom Class in Map Reduce code?

334

What is the core of the job in MapReduce framework?

328

MapReduce Types and Formats and Setting up a Hadoop Cluster?

322

It can be possible that a Job has 0 reducers?

360

Why Mapreduce output written in local disk?

340


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Un-Answered Questions { MapReduce }

What combiners are and when you should use a combiner in a mapreduce job?

98


What is a TaskInstance?

108


What is a scarce system resource?

95


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

83


Explain slot in Hadoop Map-Reduce v1?

115






Define the purpose of the partition function in mapreduce framework

82


What can be optimum value for Reducer?

304


Which among the two is preferable for the project- Hadoop MapReduce or Apache Spark?

95


What is difference between an input split and hdfs block?

89


What is reduce side join in mapreduce?

85


What is the difference between Job and Task in MapReduce?

109


What is the relation between MapReduce and Hive?

103


What do you mean by inputformat?

74


When is the reducers are started in a MapReduce job?

297


What do you understand by mapreduce?

85