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 difference between secondary namenode, checkpoint namenode & backupnod secondary namenode, a poorly named component of hadoop?

763

How to resolve ioexception: cannot create directory, while formatting namenode in hadoop?

768

How does an hadoop application look like or their basic components?

769

What mechanism does hadoop framework provides to synchronize changes made in distribution cache during runtime of the application?

714

What is partitioning?

500

Can we change the file cached by distributed cache

466

Why would nosql be better than using a sql database? And how much better is it?

518

Why we use intwritable instead of int? Why we use longwritable instead of long?

528

What happens if you don?t override the mapper methods and keep them as it is?

512

What are the side data distribution techniques?

527

Can we deploy job tracker other than name node?

720

Did you ever ran into a lop sided job that resulted in out of memory error, if yes then how did you handled it ?

474

How many maps are there in a particular job?

496

Can I set the number of reducers to zero?

430

Doesn’t google have its very own version of dfs?

523

Un-Answered Questions { Hadoop }

Explain how mapreduce works.

668

What is the difference between External and Internal Table in Hive?

782

What are the problems with Hadoop 1.0?

1097

What is throughput in HDFS?

State benefits of Hadoop users by using Apache Ambari?

State the difference between Spark SQL and Hql

367

What is the InputFormat ?

1063

Say what the views are in hive?

724

Give me examples of unstructured data?

523

How is impala metadata managed?

List out the different stream grouping in apache storm?

424

When would you use hbase?

182

What are the types of traditional method of message transfer?

622

Why is BlinkDB used?

311

What is rack-aware replica placement policy?

1068

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