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?

765

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

770

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?

510

Can we change the file cached by distributed cache

469

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?

531

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?

722

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?

498

Can I set the number of reducers to zero?

433

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

523

Un-Answered Questions { Hadoop }

Give examples of the SerDe classes whihc hive uses to Serializa and Deserilize data?

779

What is indexing and why do we need it?

858

Explain the repartition() operation in Spark?

305

How can you achieve high availability in Apache Spark?

451

what is (HS2) HiveServer2?

729

How to create table in hbase?

171

What is Rack Awareness? What is its need in Hadoop?

573

It can be possible that a Job has 0 reducers?

1013

What is the use of expand cqlsh command in Cassandra?

How do I set up flume agent?

Is it possible to provide multiple input to Hadoop? If yes then how can you give multiple directories as input to the Hadoop job?

469

How can we create a hadoop cluster from scratch?

463

Which file systems does Spark support?

309

What combiners are and when you should use a combiner in a mapreduce job?

658

Mention what is the data storage component used by hadoop?

484

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