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?

1004

Why do we use Hadoop?

925

what is the typical block size of an HDFS block?

916

What is Hadoop Custom partitioner ?

1001

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

1328

What stored in HDFS?

926

What is crontab? Explain with suitable example?

1057

What is the difference between Hadoop and Traditional RDBMS?

921

What is Partioner in hadoop? Where does it run

974

Does Hadoop requires RAID?

944

What is the purpose of DataNode block scanner?

962

What is a checkpoint?

966

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

1218

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

1734

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

361

Un-Answered Questions { Hadoop }

Why HDFS stores data using commodity hardware despite the higher chance of failures?

What is NoSQL database?

Explain the difference between nas and hdfs?

How Spark uses Hadoop?

298

When is it not recommended to use MapReduce paradigm for large

642

I have a row or key cache hit rate of 0.XX123456789 reported by JMX. Is that XX% or 0.XX% ?

What is the use of spark sql?

275

How do I achieve fifo behavior with kafka?

528

What is an Agent?

How rdd persist the data?

293

Mention what is data cleansing?

435

Clarify what combiners are and when you should utilize a combiner in a map reduce job?

592

Do I need scala for spark?

290

What are the differences between Caching and Persistence method in Apache Spark?

313

What is Starvation scenario in spark streaming?

346

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