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 the advantage of hadoop over java serialization?

What are the disadvantages of hadoop serialization?

Who is intended audience to learn avro?

What is the maximum size of string data type supported by hive? Mention the hive support binary formats.

704

What is available mechanism for connecting from applications, when we run hive as a server?

819

If you run a select * query in hive, why does it not run mapreduce?

792

Can we run unix shell commands from hive? Can hive queries be executed from script files? How? Give an example.

849

What is the precedence order of hive configuration?

983

Why hive does not store metadata information in hdfs?

1000

Whenever we run hive query, new metastore_db is created. Why?

731

How hive can improve performance with orc format tables?

774

How to change the column data type in hive? Explain rlike in hive.

751

What are the uses of explode hive?

772

how can we access the sub directories recursively?

851

How do we write our own custom serde?

748

Un-Answered Questions { Hadoop }

What is presto verifier?

How do you set up a spark?

295

What are the debugging tools used for Apache Pig scripts?

826

Explain bagtotuple?

632

What are the features of Standalone (local) mode?

652

What is an input reader in reference to mapreduce?

665

Explain the maximum size of a message that can be received by the Kafka?

762

Explain when using field grouping in storm, is there any time-out or limit to known field values?

629

Define data centre?

118

What are tools available to send the streaming data to hdfs?

Explain how cassandra writes changed data into commitlog?

Explain the features of Apache Spark because of which it is superior to Apache MapReduce?

665

Is spark a language?

295

Does spark work with python 3?

313

What do you know about sequencefileinputformat?

670

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