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 is the standalone mode in spark cluster?

239

Explain apache spark streaming? How is the processing of streaming data achieved in apache spark?

289

In what ways sparksession different from sparkcontext?

319

Explain fold() operation in spark?

293

Define sparkcontext in apache spark?

295

List out the various advantages of dataframe over rdd in apache spark?

285

What is map in apache spark?

256

Write the command to start and stop the spark in an interactive shell?

251

Define various running modes of apache spark?

265

What are the ways to run spark over hadoop?

288

What is catalyst query optimizer in apache spark?

276

What are the various types of shared variable in apache spark?

264

Define the common faults of the developer while using apache spark?

270

What is the use of spark driver, where it gets executed on the cluster?

324

What is speculative execution in spark?

303

Un-Answered Questions { Hadoop }

how you can get exactly once messaging from Kafka during data production?

515

How many types of NoSQL databases are there?

141

Explain what is namenode in hadoop?

401

What is the use of InputFormat in MapReduce process?

614

What is off heap memory in spark?

289

Who uses apache spark?

326

What is the logistic regression?

402

Does spark use java?

303

Compare hadoop & spark?

246

Explain how HDFS communicates with Linux native file system?

When should we use SORT BY instead of ORDER BY?

654

How can we kill a topology?

507

Explain schemardd?

337

What is the FlatMap Transformation in Apache Spark RDD?

271

Why spark is faster than hive?

287

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