Apache Hadoop Interview Questions
Questions Answers Views Company eMail

Why do we use HDFS for applications having large data sets and not when there are lot of small files?

1 971

What are the functions of NameNode?

1 518

How to configure hadoop to reuse JVM for mappers?

403




How to resolve IOException: Cannot create directory

288

How to change replication factor of files already stored in HDFS?

321

Which one is default InputFormat in Hadoop ?

1 662

shouldn't DFS be able to handle large volumes of data already?

429

what is a datanode?

257




How does NameNode tackle DataNode failures?

354

What is InputSplit and RecordReader?

258

What is the purpose of dfsadmin tool?

560

How can you connect an application

345

how is a file of the size 1 GB uncompressed

248

Is map like a pointer?

301

What is the default replication factor?

299


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Un-Answered Questions { Apache Hadoop }

What is the main purpose of HDFS fsck command?

848


explain Metadata in Namenode?

244


what is the typical block size of an HDFS block?

284


How we can change Replication factor when Data is on the fly?

661


What will you do when NameNode is down?

319






What is the default replication factor?

299


How do you categorize a big data?

45


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

31


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

42


What is Hadoop serialization?

47


How can we look for the namenode in the browser?

53


What alternate way does HDFS provides to recover data in case a Namenode

303


What is a checkpoint?

289


What are the network requirements for using hadoop?

31


Knox and Hadoop Development Tools?

263