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?

266

Explain values() operation in apache spark?

498

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

391

Define sparksession in apache spark? Why is it needed?

275

Describe different transformations in dstream in apache spark streaming?

304

In hadoop_pid_dir, what does pid stands for?

524

What are the network requirements for hadoop?

474

What does hadoop-env.sh do?

446

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

478

Where is hadoop-env.sh file present?

484

Can we use windows for hadoop?

477

What are the hadoop configuration files at present?

476

Can we create a hadoop cluster from scratch?

436

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

454

In which directory hadoop is installed?

406

Un-Answered Questions { Hadoop }

What is distributed copy (distcp)?

482

What is the major difference between local and remote meta-store?

902

Explain the flatMap() transformation in Apache Spark?

310

Data node block size in HDFS, why 64MB?

Is Mapreduce Required For Impala? Will Impala Continue To Work As Expected If Mapreduce Is Stopped?

677

What is difference between dataset and dataframe?

387

What is a block and block scanner in HDFS?

1030

Is there any benefit of learning MapReduce, then?

292

What is the Reducer used for?

923

How does hdfs ensure information integrity of data blocks squares kept in hdfs?

How does Cassandra write?

What are the independent extensions that are contributed to the ambari codebase?

What are shared variables?

332

What is the method to create a data frame?

317

Explain how can you minimize data transfers when working with spark?

436

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