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 to restart NameNode or all the daemons in Hadoop?

523

What does jps command do in Hadoop?

605

What is fsck?

606

How to debug Hadoop code?

494

Explain Hadoop streaming?

445

What does hadoop-metrics.properties file do?

500

How Hadoop’s CLASSPATH plays a vital role in starting or stopping in Hadoop daemons?

389

What are the different commands used to startup and shutdown Hadoop daemons?

494

What is configured in /etc/hosts and what is its role in setting Hadoop cluster?

481

How is the splitting of file invoked in Hadoop framework?

480

Is it possible to provide multiple input to Hadoop? If yes then how?

482

Is it possible to have hadoop job output in multiple directories? If yes, how?

428

What is the default replication factor and how will you change it?

491

Explain Hadoop Archives?

493

Explain the Single point of Failure in Hadoop?

445

Un-Answered Questions { Hadoop }

When is it suggested to use a combiner in a MapReduce job?

593

Name the scalar data type and complex data types in Pig?

645

How NameNode tackle Datanode failures in Hadoop?

442

Which among the two is preferable for the project- Hadoop MapReduce or Apache Spark?

565

Explain what is hadoop?

412

What is hotspotting in hbase?

167

What is the use of “void close()” method?

What alternate way does HDFS provides to recover data in case a Namenode, without backup, fails and cannot be recovered?

What is apache spark written in?

266

What happens when an action is executed in spark?

325

While starting hadoop services, datanode service is not running?

414

How to create table in hive for a json input file?

780

What are the tools that are used in ambari monitoring?

Explain the Reducer's Sort phase?

850

Explian the Advantages of HBase?

185

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