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

Apache Hadoop (394)
MapReduce (354)
Apache Hive (345)
Apache Pig (225)

Apache Ambari (93)
Apache HCatalog (34)
Apache HDFS Hadoop Distributed File System (214)
Apache Kafka (189)

Hadoop Interview Questions

Questions Answers Views Company eMail

How can one check whether NameNode is working or not?

586

How would you restart NameNode?

458

How NameNode tackle Datanode failures in Hadoop?

515

Is Namenode machine same as DataNode machine as in terms of hardware in Hadoop?

484

If DataNode increases, then do we need to upgrade NameNode in Hadoop?

502

What is meant by streaming access?

595

How to add/delete a Node to the existing cluster?

572

What is Mapper in Hadoop?

604

What is Reducer in Hadoop?

599

What are the most common InputFormats in Hadoop?

650

Explain InputSplit in Hadoop?

505

What is the purpose of RecordReader in hadoop?

525

What is Combiner in Hadoop?

580

If no custom partitioner is defined in Hadoop then how is data partitioned before it is sent to the reducer?

507

Why aggregation cannot be done in Mapper?

614

Un-Answered Questions { Hadoop }

Is kafka open source?

539

What is the difference between spark ml and spark mllib?

308

Main Components of Hadoop?

820

Use of create-hive-table command in hadoop sqoop?

What are the different parts of Hive ?

824

What languages support spark?

302

Why is pig used in hadoop?

618

What are tools available to send the streaming data to hdfs?

What is a Block Scanner in HDFS?

101

What is the InputSplit in map reduce ?

1082

What are best features of Apache Avro?

Explain how can apache spark be used alongside hadoop?

266

What are the roles and responsibilities of worker nodes in the Apache Spark cluster? Is Worker Node in Spark is same as Slave Node?

365

Clarify how ordering in hdfs is finished?

533

Is map like a pointer?

952

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