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 the basic architecture of Hadoop?

891

On what basis name node distribute blocks across the data nodes?

999

Name some companies that use Hadoop?

Airtel,

912

what is hadoop archive?

884

Rack awareness of Namenode?

808

Have you ever used Counters in Hadoop. Give us an example scenario?

1017

How is the distance between two nodes defined in Hadoop?

1421

What is bucketing in Hive?

1 1973

What is speculative execution in Hadoop?

1019

How we can change Replication factor when Data is on the fly?

1299

What alternate way does HDFS provides to recover data in case a Namenode

906

What are the problems with Hadoop 1.0?

991

what are the nodes in the Hadoop cluster?

998

What are the differences between Hive and RDBMS?

1 2256

What Mapper does?

938

Un-Answered Questions { Hadoop }

Define a worker node?

427

What problem does Apache Pig solve?

749

Is the keyword ‘DEFINE’ as a function name?

519

How can you store the data in spark?

297

Describe coalesce() operation. When can you coalesce to a larger number of partitions? Explain.

304

How to start hbase services?

210

What is a bookie in bookkeeper?

What is the process for starting a Kafka server?

551

What is apache spark engine?

281

Explain about the replication and multiplexing selectors in Flume?

How many numbers of reducers run in Map-Reduce Job?

564

What does the high availability of a name-node means? How is it accomplished?

376

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

460

What is Combiner in MapReduce?

593

What is spark vcores?

260

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