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?

255

Explain values() operation in apache spark?

482

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

382

Define sparksession in apache spark? Why is it needed?

265

Describe different transformations in dstream in apache spark streaming?

288

In hadoop_pid_dir, what does pid stands for?

490

What are the network requirements for hadoop?

456

What does hadoop-env.sh do?

417

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

429

Where is hadoop-env.sh file present?

452

Can we use windows for hadoop?

452

What are the hadoop configuration files at present?

432

Can we create a hadoop cluster from scratch?

401

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

419

In which directory hadoop is installed?

367

Un-Answered Questions { Hadoop }

What services run after running hbase job?

166

Different running modes for running Pig?

863

Explain jmx concerning hbse

170

What are the various libraries available on top of Apache Spark?

294

Name a few companies that use Apache Spark in production?

321

Wherever (Different Directory) I run the hive query, it creates new metastore_db, please explain the reason for it?

721

How do I start flume agent?

What is shuffleing in mapreduce?

613

Where is spark used?

356

What is the unit of data that flows through a flume agent?

370

Explain the use of broadcast variables

299

What is hive metastore?

677

How to create index statement in apache tajo?

What is serialization in spark?

299

What is catalyst framework in spark?

302

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