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?

584

How would you restart NameNode?

455

How NameNode tackle Datanode failures in Hadoop?

513

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

479

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

499

What is meant by streaming access?

592

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

570

What is Mapper in Hadoop?

601

What is Reducer in Hadoop?

597

What are the most common InputFormats in Hadoop?

647

Explain InputSplit in Hadoop?

503

What is the purpose of RecordReader in hadoop?

523

What is Combiner in Hadoop?

575

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

504

Why aggregation cannot be done in Mapper?

613

Un-Answered Questions { Hadoop }

What is the full form of MSLAB?

231

Explain the common input formats in hadoop?

516

What is the difference between an RDBMS and Hadoop?

697

How does an hadoop application look like or their basic components?

769

What are shared variables in Apache Spark?

341

What is SSTable? How is it different from other relational tables?

122

Can we change the file cached by distributed cache

470

What is the use of binstorage?

599

What are the collection data types provided by CQL?

What is DistributedCache and its purpose?

944

Why is apache spark so fast?

299

What is Apache Hadoop YARN?

1499

What is the process to change the files at arbitrary locations in HDFS?

1450

Name different types of primary keys in Cassandra?

Replication causes data redundancy then why is pursued in hdfs?

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