Hadoop Questions Asked in Companies

What is the relation between job and task in Hadoop? In Hadoop, A job is divided into multiple small parts known as the task

What is InputSplit in Hadoop? Explain. When a Hadoop job runs, it splits input files into chunks and assigns each split to a mapper for processing. It is called the InputSplit. What is a combiner in Hadoop? A Combiner is a mini-reduce process which operates only on data generated by a Mapper. When Mapper emits … Read more

What is the purpose of button groups? Button groups are used for the placement of more than one buttons in the same line. What is distributed cache in Hadoop? Distributed cache is a facility provided by MapReduce Framework. It is provided to cache files (text, archives etc.) at the time of execution of the job. … Read more

What is the difference between Input Split and HDFS Block? The Logical division of data is called Input Split and physical division of data is called HDFS Block Give the use of the bootstrap panel. We use panels in bootstrap from the boxing of DOM components. How JobTracker assign tasks to the TaskTracker? The TaskTracker … Read more

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