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 a "map" in Hadoop?

839

What is a "reducer" in Hadoop?

918

what is Speculative Execution?

890

Explain JobConf in MapReduce.

854

What is OutputCommitter?

864

How is reporting controlled in hadoop?

834

What is Hadoop Map Reduce ?

859

what does the text input format do?

863

What happens when a datanode fails ?

839

In Hadoop, which file controls reporting in Hadoop?

827

how can you debug Hadoop code?

893

For a job in Hadoop, is it possible to change the number of mappers to be created?

833

What are the primary phases of a Reducer?

880

how indexing in HDFS is done?

898

What is the role of a MapReduce partitioner?

861

Un-Answered Questions { Hadoop }

What are the file formats that Hive supports and can use be used for storage?

914

What is log compaction?

577

What are the modes in which Apache Hadoop run?

840

Explain how you can improve the throughput of a remote consumer?

587

What does reduce action do?

293

What is the replica placement Strategy in Cassandra ?

State some highlights of Ambari?

What is the role of “ambari-qa” user?

How do sparks work?

360

Explain is it possible to search for files using wildcards?

529

What is NameNode and DataNode in HDFS?

What is Partioner in hadoop? Where does it run

1025

Is it possible to iterate through the rows of HBase table in reverse order?

218

How do you parse data in xml? Which kind of class do you use with java to parse data?

357

What is a dstream in apache spark?

2049

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