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 executor memory in a spark application?

332

Explain caching in spark streaming.

329

Do you need to install spark on all nodes of yarn cluster?

2053

Define actions in spark.

2257

How do we create rdds in spark?

575

How is streaming implemented in spark?

1871

Explain a scenario where you will be using spark streaming.

1467

What are the languages supported by apache spark and which is the most popular one?

1724

Is there any benefit of learning mapreduce if spark is better than mapreduce?

1820

How can apache spark be used alongside hadoop?

1821

Define partitions in apache spark.

2194

Is there an api for implementing graphs in spark?

2046

Explain accumulators in apache spark.

2094

What file systems does spark support?

1802

What is a dstream in apache spark?

2049

Un-Answered Questions { Hadoop }

How does groupbykey work in spark?

311

Why Mapreduce output written in local disk?

1060

What is the importance of eval tool?

Do I need scala for spark?

311

What is partitioner and its usage?

746

What does the command mapred.job.tracker do?

831

How will format the HDFS ?

1120

Which language is better for spark?

313

Explain the key benefits of using storm for real time processing?

462

What is streaming in Hadoop?

464

What is the difference between hadoop and other data processing tools?

732

What is the difference between leader and follower in kafka?

602

How is anti-entropy associated with merkel tree?

What is the purpose of exploding in hive?

715

What is a block in HDFS? what is the default size in Hadoop 1 and Hadoop 2? Can we change the block size?

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