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 are the functions of NameNode?

1 1889

How to configure hadoop to reuse JVM for mappers?

1151

mapper or reducer?

935

How to resolve IOException: Cannot create directory

961

Does Pig support multi-line commands?

861

How to change replication factor of files already stored in HDFS?

954

Which one is default InputFormat in Hadoop ?

1 2251

shouldn't DFS be able to handle large volumes of data already?

1017

What is Apache Pig?

771

what is a datanode?

878

How does NameNode tackle DataNode failures?

1105

What is InputSplit and RecordReader?

875

What is the purpose of dfsadmin tool?

1191

How can you connect an application

979

What are combiners? When should I use a combiner in my MapReduce Job?

862

Un-Answered Questions { Hadoop }

What is sc textfile?

318

What are the different UDF’s in Pig?

601

What are channel selectors?

948

Give examples of the SerDe classes which hive uses to Serialize and Deserialize data?

656

How to Containerizing ZooKeeper With Docker?

Define the run-time architecture of Spark?

263

What is dynamic partitioning and when is it used?

972

What is spark repartition?

295

Why do we need Hadoop?

491

What do you mean by logging in cassandra?

what job does the conf class do?

740

what is the traditional method of message trfer?

520

Explain what does hbase consists of?

153

What is REST?

236

what is Memtable in Cassandra?

105

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