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

Name some internal daemons used in spark?

359

Name the two types of shared variable available in Apache Spark?

305

Explain distnct(),union(),intersection() and substract() transformation in Spark?

328

Explain Accumulator in Spark?

435

What is Speculative Execution in Apache Spark?

287

Name three data source available in SparkSQL

308

Is it possible to use Apache Spark for accessing and analyzing data stored in Cassandra databases?

304

Can you explain how you can use Apache Spark along with Hadoop?

309

Explain Dsstream with reference to Apache Spark

391

What is the role of Driver program in Spark Application?

274

Define the term ‘Lazy Evolution’ with reference to Apache Spark

306

What are the benefits of Spark lazy evaluation?

320

State the difference between Spark SQL and Hql

357

Can I run Apache Spark without Hadoop?

291

Please explain the sparse vector in Spark.

284

Un-Answered Questions { Hadoop }

List out the commands that are used to start, check the progress and stop the ambari server?

Query language is executed in Cassandra database. Clarify?

140

How does yarn work with spark?

289

How Pig differs from MapReduce?

808

What is the use of explode in Hive?

732

Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?

684

What is hotspotting in hbase?

177

What is the use of context object?

467

Is it possible to search for files using wildcards?

643

how Cassandra delete Data?

114

Why can we not create directory /user/dataflair/inpdata001 when name node is in safe mode?

454

What is Reducer in Hadoop?

553

Explain different transformations in DStream in Apache Spark Streaming?

331

Explain Data Type Conversion in Hive?

723

Compare rdbms with hbase?

146

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