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

Different Running Modes of Apache Spark

318

How will you calculate the number of executors required to do real-time processing using Apache Spark? What factors need to be considered for deciding on the number of nodes for real-time processing?

318

List the popular use cases of Apache Spark?

305

What is Spark.executor.memory in a Spark Application?

313

Compare Hadoop and Spark?

341

What is write ahead log(journaling) in Spark?

443

What are Actions?

332

What are the limitations of Spark?

304

What is a reliable and unreliable receiver in Spark?

339

In a given spark program, how will you identify whether a given operation is Transformation or Action ?

361

Can you list down the limitations of using Apache Spark?

326

Can you use Spark for ETL process?

300

What are the disadvantages of using Spark?

334

Where does Spark Driver run on Yarn?

304

Explain the terms Spark Partitions and Partitioners?

314

Un-Answered Questions { Hadoop }

Explain Multi-tenancy?

596

How to configure the number of the Combiner in MapReduce?

670

Define data replication?

State some impala hadoop benefits?

What do the master class and the output class do?

707

How to skip header rows from a table in Hive?

866

Explain the hdfs architecture and list the various hdfs daemons in hdfs cluster?

What is a block and block scanner in HDFS?

1067

Does spark sql use hive?

295

Define various running modes of apache spark?

305

What are the differences between relational databases and impala?

What is a Backup node in Hadoop?

612

What is the use of spark sql?

290

What is an "RDD Lineage"?

315

Mention what are the main configuration parameters that user need to specify to run mapreduce job?

787

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