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

Discuss the precautions that are needed to take care while adding a column?

What are different logging levels in cassandra?

Describe the different consistency levels for read operation in cassandra?

Give the differences between the different types of primary keys in cassandra?

What are the main benefits of using cassandra?

What do you mean by tunable consistency?

100

What do you understand by logging in cassandra?

What do you mean by ss table?

Discuss and explain the various types of partitioners in cassandra?

What do you understand by the super column in cassandra?

Elucidate the concept of cap theorem?

What is the procedure of data storage in cassandra?

What do you understand by the term snitch in cassandra? Give some example.

Is it possible to add or delete column families in a working group?

What is mapper in map reduce?

699

Un-Answered Questions { Hadoop }

Should I install spark on all nodes of yarn cluster?

358

Explain JobConf in MapReduce.

854

Do we need to give a password, even if the key is added in ssh?

768

You have a file personal_data.txt in the HDFS directory with 100 records. You want to see only the first 5 records from the employee.txt file. How will you do this?

836

What is accumulator in spark?

511

what are views in Hive?

805

Is hive a nosql database?

688

Give me the examples of Columnar database ?

625

Which command is used to list all the tables in a database or list all the columns in a table?

What are the differences between PIG and HIVE?

647

What are the exact differences between reduce and fold operation in Spark?

465

What are the benefits of block transfer?

1036

Suppose there is file of size 514 mb stored in hdfs (hadoop 2.x) using default block size configuration and default replication factor. Then, how many blocks will be created in total and what will be the size of each block?

129

How is Apache Spark better than Hadoop?

311

What is the use of dataframe in spark?

306

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