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

How to restart NameNode or all the daemons in Hadoop?

542

What does jps command do in Hadoop?

651

What is fsck?

642

How to debug Hadoop code?

535

Explain Hadoop streaming?

476

What does hadoop-metrics.properties file do?

529

How Hadoop’s CLASSPATH plays a vital role in starting or stopping in Hadoop daemons?

422

What are the different commands used to startup and shutdown Hadoop daemons?

527

What is configured in /etc/hosts and what is its role in setting Hadoop cluster?

525

How is the splitting of file invoked in Hadoop framework?

513

Is it possible to provide multiple input to Hadoop? If yes then how?

502

Is it possible to have hadoop job output in multiple directories? If yes, how?

452

What is the default replication factor and how will you change it?

533

Explain Hadoop Archives?

535

Explain the Single point of Failure in Hadoop?

477

Un-Answered Questions { Hadoop }

What do you mean by data locality?

671

How Spark handles monitoring and logging in Standalone mode?

336

Name the three layers, Ambari supports?

What is difference between hive and spark?

266

Why hbase is a schema-less database?

181

What is Small File Problem in Hadoop? How can it be resolved?

538

How Facebook Uses Hadoop, Hive and Hbase ?

707

How many datanodes can run on a single Hadoop cluster?

452

What is parallelize in spark?

285

Explain HCatStorer APIs?

What is vectorized query execution?

313

Can you explain speculative execution?

418

How can we see all the clusters that are available in Ambari?

143

what is the default replication factor in HDFS?

1015

Why are we using Flume?

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