Big Data Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Big Data Interview Questions

Questions Answers Views Company eMail

What do you mean by the High Availability of a NameNode in Hadoop HDFS?

How does HDFS ensure Data Integrity of data blocks stored in HDFS?

What is the difference between RDBMS with Hadoop MapReduce?

801

Explain what does the conf.setMapper Class do in MapReduce?

660

How to submit extra files(jars,static files) for MapReduce job during runtime in Hadoop?

773

What is a Speculative Execution in Hadoop MapReduce?

657

Explain the sequence of execution of all the components of MapReduce like a map, reduce, recordReader, split, combiner, partitioner, sort, shuffle.

658

In MapReduce, ideally how many mappers should be configured on a slave?

666

What counter in Hadoop MapReduce?

644

What is SequenceFileInputFormat in Hadoop MapReduce?

633

How many Mappers run for a MapReduce job in Hadoop?

614

How many Mappers run for a MapReduce job?

613

How do Hadoop MapReduce works?

733

What is a Distributed Cache in Hadoop?

663

Why Mapper runs in heavy weight process and not in a thread in MapReduce?

638

Un-Answered Questions { Big Data }

How Spark uses Akka?

320

What is column families? What happens if you alter the block size of ColumnFamily on an already populated database?

1107

Agent communicate with other Agents?

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

908

How many types of tunable consistency are supported in Cassandra?

How can the columns of a table in hive be written to a file?

711

What all tasks you can perform for managing services using Ambari service tab?

What is the importance of — the split-by clause in running parallel import tasks in sqoop?

Explain the fundamental difference between Cassandra and Hadoop?

224

How does impala achieve its performance improvements?

What is the difference between Hive CLI and Beeline?

847

What are use cases of Apache Flume?

What is KeyValueTextInputFormat in Hadoop?

535

What is a bloom filter?

162

What is the purpose of Hive Driver?

1055

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