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

Can you explain about the cluster manager of apache spark?

276

If map reduce is inferior to spark then is there any benefit of learning it?

300

How can we create rdds in apache spark?

323

What are accumulators in spark?

326

Can you mention some features of spark?

337

What do you understand by the partitions in spark?

333

What is a hive on spark?

313

Mention what is the hadoop mapreduce apis contract for a key and value class?

728

Explain what combiners are and when you should use a combiner in a mapreduce job?

657

What is the function of mapreduce partitioner?

692

What combiners are and when you should use a combiner in a mapreduce job?

654

Explain what is “map” and what is "reducer" in hadoop?

697

Explain what does the conf.setmapper class do?

662

Explain what are the basic parameters of a mapper?

861

Mention what is the next step after mapper or maptask?

694

Un-Answered Questions { Hadoop }

Can free-form SQL queries be used with Sqoop import command? If yes, then how can they be used?

What is Hadoop HDFS – Hadoop Distributed File System?

What is spark tool in big data?

288

Explain about the execution pl of a pig script?
or
differentiate between the logical and physical plan of an apache pig script?

542

What is serialization in spark?

332

Compare hbase vs hdfs?

How to keep HDFS cluster balanced?

1131

What is a block and block scanner in HDFS?

1061

What are the various levels of persistence in Apache Spark?

326

What is Reducer in MapReduce?

771

What are different logging levels in cassandra?

Give the sqoop command to see the content of the job named myjob?

How can I speed up my spark?

283

What is the meaning of speculative execution in Hadoop? Why is it important?

1087

What do you understand by the super column in cassandra?

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