Big Data Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Big Data Interview Questions

Questions Answers Views Company eMail

What happen on the namenode when a client tries to read a data file?

1 527

What is replication factor?

1 509

If the hadoop administrator needs to make a change, which configuration file does he need to change?

1 515

What is distributed copy (distcp)?

1 551

What is the role of the secondary namenode?

1 509

Are there any special requirements for namenode?

1 474

is there a standard procedure to deploy hadoop?

1 476

What happen if a datanode loses network connection for a few minutes?

1 662

What is the procedure for namenode recovery?

1 502

How would an hadoop administrator deploy various components of hadoop in production?

1 471

What happen if one of the datanodes has much slower cpu?

1 491

After increasing the replication level, I still see that data is under replicated. What could be wrong?

1 533

Web-ui shows that half of the datanodes are in decommissioning mode. What does that mean? Is it safe to remove those nodes from the network?

1 521

What is the difference between a hadoop database and relational database?

1 520

Can we deploye job tracker other than name node?

1 714

Un-Answered Questions { Big Data }

What are the different types of tables available in Hive?

749

How to skip header rows from a table in Hive?

875

Where does the data of a Hive table gets stored?

727

State some DDL Command with brief Description?

How job tracker schedules an assignment?

478

Can free-form SQL queries be used with Sqoop import command? If yes, then how can they be used?

What is a Hive variable? What for we use it?

858

What is the stable version of Hive ?

2677

What is the function of UNION and SPLIT operators? Give examples?

591

How can you import only a subset of rows from a table?

How you can contact your client everyday ?

1018

What is the roadmap for apache mahout version 1.0?

What is the latest version of ambari that is available in the present market?

When to choose "External Table" in Hive?

851

When to use explode in Hive?

808

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