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

Are there any special requirements for namenode?

463

is there a standard procedure to deploy hadoop?

465

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

647

What is the procedure for namenode recovery?

495

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

460

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

476

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

513

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?

490

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

495

Can we deploye job tracker other than name node?

702

What is difference between secondary namenode, checkpoint namenode & backupnode?

508

Name the most common input formats defined in hadoop?

484

Which one is default?

530

Is it possible to have hadoop job output in multiple directories?

478

What is tasktracker in hadoop?

475

Un-Answered Questions { Hadoop }

What are the four basic parameters of a mapper?

621

What is shuffling and sorting in Hadoop MapReduce?

686

How we can take Hadoop out of Safe Mode?

898

Mention the date data type in hive. Name the hive data type collection.

742

State some impala hadoop benefits?

What is a bookkeeper client in bookkeeper?

What is Writable & WritableComparable interface?

970

Explain api create or replace tempview()?

351

How to show up details in pig ?

631

Can you explain about the cluster manager of apache spark?

276

Establish the difference between a node, cluster & data centres in Cassandra.

153

What is pair rdd in spark?

297

why should we use 'filters' in pig scripts?

592

Are there any problems which can only be solved by MapReduce and cannot be solved by PIG? In which kind of scenarios MR jobs will be more useful than PIG?

825

List out the some common problems faced by data analyst?

468

For More Un-Answered { Hadoop } Questions Click Here