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?

727

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

734

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

735

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

673

What is partitioning?

472

Can we change the file cached by distributed cache

433

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

485

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

483

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

462

What are the side data distribution techniques?

484

Can we deploy job tracker other than name node?

684

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

442

How many maps are there in a particular job?

460

Can I set the number of reducers to zero?

399

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

484

Un-Answered Questions { Hadoop }

Is it possible to rename the output file?

793

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

727

Where the mapper's intermediate data will be stored?

644

Can we do real-time processing using spark sql?

310

What are the limitations of importing RDBMS tables into Hcatalog directly?

946

What is a tuple?

1201

What is Spark Streaming?

297

State some DDL Command with brief Description?

How many JVMs run on a slave node?

1049

What are the restriction to the key and value class ?

433

What is a block and block scanner in HDFS?

1032

What are consumers in kafka?

541

How is rdd fault?

286

What can you do with Kafka?

554

What are use cases of Apache Flume?

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