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

Explain write ahead log(journaling) in spark?

251

Explain values() operation in apache spark?

467

Define the level of parallelism and its need in spark streaming?

374

Define sparksession in apache spark? Why is it needed?

259

Describe different transformations in dstream in apache spark streaming?

282

In hadoop_pid_dir, what does pid stands for?

473

What are the network requirements for hadoop?

447

What does hadoop-env.sh do?

403

Which are the three modes in which hadoop can be run?

413

Where is hadoop-env.sh file present?

444

Can we use windows for hadoop?

440

What are the hadoop configuration files at present?

425

Can we create a hadoop cluster from scratch?

395

What happens if you get a ‘connection refused java exception’ when you type hadoop fsck /?

411

In which directory hadoop is installed?

360

Un-Answered Questions { Hadoop }

What is the point of apache spark?

258

how can you debug Hadoop code?

785

What do you mean by snitch?

Define NoSQL Database?

What are the advantages of using map side join in mapreduce?

601

How to copy a file into HDFS with a different block size to that of existing block size configuration?

what is SStable consist of?

What is a tuple in pig?

492

How to change replication factor of files already stored in HDFS?

955

Explain what is namenode in hadoop?

401

How to resolve IOException: Cannot create directory

962

What is the difference between HDFS and NAS ?

1315

If I create a folder in HDFS, will there be metadata created corresponding to the folder? If yes, what will be the size of metadata created for a directory?

Specify the partitions in hive?

621

What is a tuple?

1086

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