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?

590

What does jps command do in Hadoop?

705

What is fsck?

693

How to debug Hadoop code?

575

Explain Hadoop streaming?

515

What does hadoop-metrics.properties file do?

576

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

464

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

589

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

585

How is the splitting of file invoked in Hadoop framework?

573

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

551

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

494

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

586

Explain Hadoop Archives?

587

Explain the Single point of Failure in Hadoop?

517

Un-Answered Questions { Hadoop }

What is a distributed cache in mapreduce framework?

667

Define the term thrift

138

What are the data components used by Hadoop?

789

What is Apache Hive?

878

Compare Transformation and Action in Apache Spark?

297

What are the various components in kafka.

610

Explain how can spark be connected to apache mesos?

300

What are impala built-in functions?

Define composite type in Cassandra?

What is a relation in Pig?

757

What is DataFrames?

385

How to configure hadoop to reuse JVM for mappers?

1241

Explain the difference between gen1 and gen2 hadoop with regards to the namenode?

770

What is a block in HDFS? what is the default size in Hadoop 1 and Hadoop 2? Can we change the block size?

What is the importance of driver in hive?

760

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