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 are the benefits of block transfer?

994

How did you debug your Hadoop code ?

1371

What will you do when NameNode is down?

1008

What is the best hardware configuration to run Hadoop?

1628

Should we use RAID in Hadoop or not?

1058

How to change Replication Factor For below cases ?

1088

What are the basic available commands in Hadoop sqoop ?

964

On What concept the Hadoop framework works?

1200

How to write a Custom Key Class?

940

What if rack 2 and datanode fails?

1060

How client application interacts with the NameNode?

958

How is the option in Hadoop to skip the bad records?

949

How the HDFS Blocks are replicated?

965

Explain InputFormat?

1020

What is Rack awareness?

999

Un-Answered Questions { Hadoop }

What port does spark use?

318

Describe coalesce() operation. When can you coalesce to a larger number of partitions? Explain.

331

What we need to be taken care while adding a column?

100

What did mean by data-node?

428

What are the differences between PIG and SQL?

644

What is the Use of SSH in Hadoop ?

959

Do I need to learn scala for spark?

315

I have a relation r. How can I get the top 10 tuples from the relation r?

568

Does HDFS allow a client to read a file which is already opened for writing in hadoop?

Mention what is the next step after mapper or maptask?

634

What is difference between reducer and combiner?

565

Is spark and hadoop same?

266

What is Apache Hadoop?

856

Give the data storage units in Cassandra?

What happens if the preferred replica is not in the isr?

570

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