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

Is client the end user in HDFS?

941

Can the balancer be run while Hadoop is in use?

925

Explain the difference between NameNode

879

What is the utility of using Writable Comparable Custom Class in Map Reduce code?

944

Explain about Hive Buckets with Example ?

2 2437

What other technologies have you used in hadoop sta ck?

928

what is difference between int and intwritable?

1409

What is Apache Hadoop YARN?

1416

What is a JobTracker in Hadoop? How many instances of JobTracker run on a Hadoop Cluster?

1063

What are channel selectors?

951

What are the stable versions of Hadoop?

954

Input Split & Record Reader and what they do?

969

what is the default replication factor in HDFS?

974

What is the core of the job in MapReduce framework?

794

How indexing is done in HDFS?

1018

Un-Answered Questions { Hadoop }

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

Tell me about the execution modes of Apache Pig?

510

How can you remove the elements with a key present in any other RDD?

279

Where sorting is done in Hadoop MapReduce Job?

611

Explain what is zookeeper in kafka? Can we use kafka without zookeeper?

507

What is the difference between Hadoop and RDBMS?

584

Explain about the common workflow of a Spark program?

307

Why aggregation cannot be done in Mapper?

520

Can you mention some features of spark?

305

What do you understand by node in cassandra?

What does the mapred.job.tracker command do?

397

Does the HDFS go wrong? If so, how?

What in hive made out of?

650

What is the use of shutdown command?

202

Can hadoop handle streaming data?

426

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