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

What is the advantage of hadoop over java serialization?

What are the disadvantages of hadoop serialization?

Who is intended audience to learn avro?

What is the maximum size of string data type supported by hive? Mention the hive support binary formats.

671

What is available mechanism for connecting from applications, when we run hive as a server?

775

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

756

Can we run unix shell commands from hive? Can hive queries be executed from script files? How? Give an example.

811

What is the precedence order of hive configuration?

946

Why hive does not store metadata information in hdfs?

955

Whenever we run hive query, new metastore_db is created. Why?

691

How hive can improve performance with orc format tables?

727

How to change the column data type in hive? Explain rlike in hive.

711

What are the uses of explode hive?

728

how can we access the sub directories recursively?

803

How do we write our own custom serde?

719

Un-Answered Questions { Hadoop }

Can you explain rack awareness?

441

Is nosql follow relational db model?

472

What is the bag?

549

What is SequenceFileInputFormat in Hadoop MapReduce?

635

Comparison between Secondary NameNode and Checkpoint Node in Hadoop?

516

List the diagnostic operators in pig.

596

What is a task tracker?

What are the different tools used for Ambari monitoring purpose?

What happened after creating a table in hive ?

741

What is the difference between Caching and Persistence in Apache Spark?

323

How do I stop flume agent?

Define sparkcontext in apache spark?

315

Which storage level does the cache () function use?

301

What is aws spark?

279

In which directory hadoop is installed?

413

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