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 IdentityMapper?

933

Why do we use Hadoop?

869

what is the typical block size of an HDFS block?

861

What is Hadoop Custom partitioner ?

947

What is the default block size in Hadoop 1 and in Hadoop 2? Can it be changed?

1272

What stored in HDFS?

863

What is crontab? Explain with suitable example?

992

What is the difference between Hadoop and Traditional RDBMS?

874

What is Partioner in hadoop? Where does it run

923

Does Hadoop requires RAID?

889

What is the purpose of DataNode block scanner?

882

What is a checkpoint?

918

Did you ever ran into a lop sided job that resulted in out of memory error

1164

What is the communication channel between client and namenode/datanode?

1687

What are the different operational commands in HBase at record level and table level?

347

Un-Answered Questions { Hadoop }

When do you call the cleanup method?

490

Which one will you choose for a project –Hadoop MapReduce or Apache Spark?

285

Can you define the process of creating ambari client?

What is Rack Awareness in Apache Hadoop?

744

What do you understand by data center in cassandra?

If I create a folder in HDFS, will there be metadata created corresponding to the folder? If yes, what will be the size of metadata created for a directory?

What is a rack awareness algorithm and why is it used in hadoop?

Is it necessary to know java to learn hadoop?

609

Explain about the different channel types in Flume. Which channel type is faster?

167

What is a spark standalone cluster?

231

What is Data Log in Kafka?

741

What is the prerequisite for Apache Hive installation?

669

When we create an rdd, does it bring the data and load it into the memory?

325

What is a skewed join?

556

Is hadoop a database?

622

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