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?

476

What is Disk Balancer in Hadoop?

464

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

395

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

433

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

520

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

462

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

418

What is a Heartbeat in Hadoop?

527

Comparison between Secondary NameNode and Checkpoint Node in Hadoop?

481

What is a Backup node in Hadoop?

509

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

470

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

548

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

1253

What is Balancer in Hadoop?

439

What is active and passive NameNode in Hadoop?

442

Un-Answered Questions { Hadoop }

What is spark executor cores?

281

Explain some Kafka Streams real-time Use Cases?

499

What does hdfs mean?

Explain the LOAD keyword in Pig script?

598

What are the common mistakes developers make when running Spark applications?

274

Define hadoop archives? What is the command for archiving a group of files in hdfs.

How hbase handles the write failure?

202

What happens if the block on Hadoop HDFS is corrupted?

Clarify what jobtracker is in hadoop? What are the activities followed by hadoop?

400

What happens if number of reducers are 0?

448

What are the different CQL data manipulation commands in Cassandra?

111

Explain what happens if, during the PUT operation, HDFS block is assigned a replication factor 1 instead of the default value 3?

Why to use hbase?

152

What is Block in HDFS?

Explain what are the basic parameters of a mapper?

766

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