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?

1046

Why do we use Hadoop?

961

what is the typical block size of an HDFS block?

953

What is Hadoop Custom partitioner ?

1045

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

1358

What stored in HDFS?

969

What is crontab? Explain with suitable example?

1097

What is the difference between Hadoop and Traditional RDBMS?

956

What is Partioner in hadoop? Where does it run

1024

Does Hadoop requires RAID?

991

What is the purpose of DataNode block scanner?

1013

What is a checkpoint?

1008

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

1278

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

1769

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

371

Un-Answered Questions { Hadoop }

how can we access the sub directories recursively?

840

Is piglatin a strongly typed language? If yes, then how did you come to the conclusion?

666

What is big data spark?

330

Mention what is the number of default partitioner in Hadoop?

744

Can we deploy job tracker other than name node?

718

How is security achieved in Apache Hadoop?

960

What is the key difference between NameNode and DataNode in Hadoop?

525

How does a client read/write data in HDFS?

Map reduce jobs take too long. What can be done to improve the performance of the cluster?

747

What is the difference between Reducer and Combiner in Hadoop MapReduce?

727

How Big is ‘Big Data’?

457

What is HBase Shell?

176

What are the ways in which Apache Spark handles accumulated Metadata?

370

What is hadoop? Name the main components of a hadoop application?

472

How do I check my spark status?

297

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