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 Erasure Coding in Hadoop?

503

What is Disk Balancer in Hadoop?

513

How would you check whether your NameNode is working or not?

420

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

461

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

551

What happens if the number of reducers is 0 in Hadoop?

481

Why is Data Block size set to 128 MB in Hadoop?

439

What is a Heartbeat in Hadoop?

560

Comparison between Secondary NameNode and Checkpoint Node in Hadoop?

505

What is a Backup node in Hadoop?

560

What do you mean by the NameNode High Availability in hadoop?

495

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

590

Why Hadoop performs replication, although it results in data redundancy?

1280

What is Balancer in Hadoop?

472

What is active and passive NameNode in Hadoop?

463

Un-Answered Questions { Hadoop }

How many types of ambari repositories are available?

Explain the concept of cassandra data model?

114

Does google use hadoop?

672

what is SStable consist of?

Can you explain difference between apache mahout and apache spark’s mllib?

What if a namenode has no data?

667

How to managed create a table in hive ?

709

Explain Clustering in Hive?

707

What is Block in HDFS?

What is metastore?

633

What is difference between scala and spark?

319

If you run a select * query in hive, why does it not run mapreduce?

743

What do you understand by receivers in Spark Streaming ?

326

How can we see only top 15 records from the student.txt out of100 records in the HDFS directory?

579

What is SuperColumn in Cassandra?

109

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