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

Explain about Hadoop file system and processing framework?

465

How Hadoop is cost-effective?

451

What does the mapred.job.tracker command do?

473

Is it possible to rename the output file, and if so, how?

503

What are the Hadoop features extended to its eco-system components ?

485

What is job tracker in Hadoop?

545

What sorts of actions does the job tracker process perform?

472

What are the main components in Hadoop Eco-System and what are their functions ?

527

Name the most common Input Formats defined in Hadoop? Which one is default?

496

What is the block size in Hadoop?

472

Can you give some examples of Big Data?

520

After the Map phase finishes, the Hadoop framework does 'Partitioning, Shuffle and sort'. Explain what happens in this phase?

518

What is streaming in Hadoop?

467

What is a commodity hardware? Does commodity hardware include RAM?

556

What is streaming access?

536

Un-Answered Questions { Hadoop }

What do you mean by schema on read?

759

How to handle record boundaries in Text files or Sequence files in MapReduce InputSplits?

735

Why Hadoop MapReduce?

711

When would you use hbase?

184

Explain how indexing is done in hdfs?

Say when to pick “inward table” and “outside table” in hive?

752

Define the Use of MapReduce?

722

What features from relational databases or hive are not available in impala?

What is a record reader?

449

Compare Hadoop 2 and Hadoop 3?

460

What is the main difference between Kafka and Flume?

740

Do we need to install spark in all nodes?

285

What are the core benefits for hadoop users by using apache ambari?

Explain what is the row key?

153

Explain the flatMap operation on Apache Spark RDD?

334

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