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 a mapreduce algorithm?

703

What is mapreduce algorithm?

640

What is hdfs block size?

How hdfs is different from traditional file systems?

How is hdfs block size different from traditional file system block size?

When the reducers are are started in a mapreduce job?

650

Where the mapper's intermediate data will be stored?

680

Which are the methods in the mapper interface?

682

What is a namenode? How many instances of namenode run on a hadoop cluster?

692

What do you mean by taskinstance?

795

How hdfa differs with nfs?

784

How a task is scheduled by a jobtracker?

718

How many maximum jvm can run on a slave node?

728

What are the two main parts of the hadoop framework?

702

What is the use of combiners in the hadoop framework?

649

Un-Answered Questions { Hadoop }

What do you mean by Free Form Import in Sqoop?

What happen on the namenode when a client tries to read a data file?

505

did you maintain the hadoop cluster in-house or used hadoop in the cloud?

1051

Explain how is data partitioned before it is sent to the reducer if no custom partitioner is defined in hadoop?

477

What are the methods to set up the local repository in different methods?

How multi-hop agent can be setup in Flume?

110

What is spark code?

327

How do users interact with the shell in apache pig?

574

Which is the best hadoop certification?

714

Why HDFS performs replication, although it results in data redundancy in Hadoop?

What is the difference between Gen1 and Gen2 Hadoop with regards to the Namenode?

1212

What is the difference between hadoop and spark?

296

What does dag stand for?

309

What is tungsten in spark?

425

Mention what is the difference between an rdbms and hadoop?

469

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