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 HDFS block size and what did you chose in your project?

1016

What is HDFS High Availability?

1017

What are different types of filesystem?

1180

how can we change Replication Factor?

1073

What is Hive Present Version ?

1136

What is the purpose of Hive Driver?

1096

In which scenario Hive is good fit?

1023

Can i access Hive Without Hadoop ?

1 2759

What is difference between internal and external tables in hive?

1 2492

When Hive is run in embedded mode

1920

Can you execute Hadoop dfs Commands from Hive CLI? How?

1203

List the various options available with the Hive command?

951

Why Mapreduce output written in local disk?

1061

What is identity mapper and reducer? In which cases can we use them?

1042

Is YARN a replacement of Hadoop MapReduce?

1 2098

Un-Answered Questions { Hadoop }

What is the difference between apache mahout and cloudera oryx ?

What are the characteristics of hadoop framework?

701

How to copy file from HDFS to local?

What is the default partition in spark?

300

Explain coalesce operation in Apache Spark?

343

What is Internal and External table in Hive?

758

What is hive metastore?

755

If reducers do not start before all mappers finish then why does the progress on mapreduce job shows something like map(50%) reduce(10%)? Why reducers progress percentage is displayed when mapper is not finished yet?

760

Is the keyword ‘FUNCTIONAL’ a User Defined Function (UDF)?

596

Explain what happens if you alter the block size of a column family on an already occupied database?

174

What is pig statistics?

566

What do you understand by unit and ()in scala?

535

Why is block size large in Hadoop?

Who creates dag in spark?

358

What is dataframe api?

336

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