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?

935

Why do we use Hadoop?

871

what is the typical block size of an HDFS block?

864

What is Hadoop Custom partitioner ?

951

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

1275

What stored in HDFS?

865

What is crontab? Explain with suitable example?

994

What is the difference between Hadoop and Traditional RDBMS?

875

What is Partioner in hadoop? Where does it run

925

Does Hadoop requires RAID?

890

What is the purpose of DataNode block scanner?

884

What is a checkpoint?

921

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

1166

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

1688

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

347

Un-Answered Questions { Hadoop }

How to specify more than one path for storage in Hadoop?

459

What is Input Split in hadoop?

919

What are the majorly used commands in sqoop?

What is a row in cassandra? And what are the different elements of it?

What are the core api’s of kafka?

469

Will various customers write into an hdfs record simultaneously?

How to delete the table with the HBase shell?

137

How is hdfs block size different from traditional file system block size?

What does dag stand for?

276

How can you achieve high availability in Apache Spark?

415

What is zookeper?

What is SparkSession in Apache Spark?

271

Mention what is the difference between hdfs and nas?

Why is jconsole used?

What is dataproc cluster?

274

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