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

How can we assure that the values regarding a particular key goes to the same reducer?

616

What is pig statistics?

535

List the relational operators in pig.

645

What are all stats classes in the java api package available?

567

List the diagnostic operators in pig.

595

Why do we need indexing?

720

What will happen in case you have not issued the command: ‘set hive.enforce.bucketing=true;’ before bucketing a table in hive in apache hive 0.x or 1.x?

776

What is hbase fsck?

214

What are different tombstone markers in hbase?

156

What is the use of get() method?

153

Can you explain data versioning?

172

How will you design or modify schema in hbase programmatically?

157

What happens when you issue a delete command in hbase?

166

What is a bloom filter and how does it help in searching rows?

177

Hbase blocksize is configured on which level?

166

Un-Answered Questions { Hadoop }

What is dataframe in spark?

289

What is the difference between apache mahout and apache spark’s mllib?

Explain the features of pseudo mode?

712

Can a spark cause a fire?

329

Name different types of NoSQL database?

What is in memory in spark?

282

What is the spark driver?

327

Which interface needs to be implemented to create Mapper and Reducer for the Hadoop?

1220

How many distinct layers are of storm’s codebase?

614

What is check pointing in hadoop?

446

Explain the operation reduce() in Spark?

288

what is a sequence file in Hadoop?

683

What are the use cases of Apache Pig?

804

Mention what is the best way to copy files between hdfs clusters?

Explain the composite key?

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