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?

549

What is Disk Balancer in Hadoop?

569

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

449

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

509

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

588

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

515

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

472

What is a Heartbeat in Hadoop?

610

Comparison between Secondary NameNode and Checkpoint Node in Hadoop?

554

What is a Backup node in Hadoop?

608

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

533

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

648

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

1319

What is Balancer in Hadoop?

526

What is active and passive NameNode in Hadoop?

504

Un-Answered Questions { Hadoop }

What are the main components of a Hadoop Application?

1081

What OS Cassandra supports?

What is the Use of Sqoop?

How does speculative execution work in Hadoop?

483

What are the default record and field delimiter used for hive text files?

864

Wherever (Different Directory) I run hive query, it creates new metastore_db, please explain the reason for it?

705

What do you mean by commit log in Cassandra?

Is HDFS utilized in Cassandra? If yes, where?

How many ways we can create rdd?

293

Tunable consistency is supported by Cassandra. Explain.

Specify Cassandra’s importance on Facebook?

155

Are sparks dangerous?

358

What is pagerank?

300

When running Spark applications, is it necessary to install Spark on all the nodes of YARN cluster?

343

What operations does rdd support?

299

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