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 to stop a partition form being queried?

1196

What ate the key components of Hive Architecture?

893

Does Pig give any warning when there is a type mismatch or missing field?

942

What is Hive query processor?

954

Explain the need for MapReduce while programming in Apache Pig?

811

What are the relational operators available related to loading and storing in pig language?

664

What are the different pig data types?

786

Explain about the different complex data types in Pig?

702

What is a relation in Pig?

755

Explain the difference between COUNT_STAR and COUNT functions in Apache Pig?

815

How should 'store' keyword is useful in pig scripts?

678

What is the use of having Filters in Apache Pig ?

742

How to write 'foreach' statement for map datatype in pig scripts?

704

What are the basic steps to writing a UDF Function in Pig?

735

What are the various diagnostic operators available in Apache Pig?

773

Un-Answered Questions { Hadoop }

How hive can improve performance with orc format tables?

772

What is the use of rdd in spark?

286

Why aggregation cannot be done in Mapper?

609

What is the logistic regression?

475

What is apache spark sql?

311

What is accumulators and broadcast variables in spark?

339

What is a Secondary Namenode? Is it a substitute to the Namenode?

1066

Why are the number of splits equal to the number of maps?

1011

Explain the difference between an hdfs block and input split?

What a task tracker is in hadoop?

476

Give some important features of SPM?

101

Is there another way to check whether Namenode is working?

456

How does impala process join queries for large tables?

What is Mapper? How can we compress Mapper output in Hadoop?

552

What are the important modes of hadoop?

579

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