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

312

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?

291

List the popular use cases of Apache Spark?

291

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

305

Compare Hadoop and Spark?

326

What is write ahead log(journaling) in Spark?

429

What are Actions?

322

What are the limitations of Spark?

294

What is a reliable and unreliable receiver in Spark?

322

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

347

Can you list down the limitations of using Apache Spark?

313

Can you use Spark for ETL process?

281

What are the disadvantages of using Spark?

311

Where does Spark Driver run on Yarn?

288

Explain the terms Spark Partitions and Partitioners?

305

Un-Answered Questions { Hadoop }

Describe what happens to a mapreduce job from submission to output?

668

Knox and Hadoop Development Tools?

938

List few differences between apache kafka and rabbitmq?

574

What happens if the block in HDFS is corrupted?

What are the different Primitive Data Types available in Hive?

703

How many Reducers run for a MapReduce job?

701

What is the maximum number of rows in a table?

Explain first() operation in Apache Spark?

299

Have you ever used counters in hadoop?

426

What is rack-aware replica placement policy?

1039

Clarify Memtable?

What is the Internal Architecture of the Cassandra Database ?

Mention what is the maximum size of the message does kafka server can receive?

539

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?

689

What does streams api in kafka?

529

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