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 the difference between hbase and hadoop/hdfs?

177

When should you use hbase?

192

What is wal and hlog in hbase?

317

What is a cell in hbase?

190

What are the different types of filaters used in hbase?

195

How to create hadoop archive?

460

When should be hadoop archive create?

467

What mode(s) can hadoop code be run in?

494

How often do you need to reformat the namenode?

559

What is the role of the namenode?

499

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

507

What is replication factor?

489

If the hadoop administrator needs to make a change, which configuration file does he need to change?

498

What is distributed copy (distcp)?

530

What is the role of the secondary namenode?

487

Un-Answered Questions { Hadoop }

State the usage of 'filters', 'group' , 'orderBy', 'distinct' keywords in pig scripts?

698

What happens if one hadoop client renames a file or a directory containing this file while another client is still writing into it?

491

What do you mean by metadata in HDFS? Where is it stored in Hadoop?

100

On what basis Namenode will decide which datanode to write on?

1300

Wherever (Different Directory) I run hive query, it creates new metastore_db, please explain the reason for it?

706

What is UDF?

959

Explain different transformation on DStream?

288

Define Partition and Partitioner in Apache Spark?

318

What does apache mahout do?

What is the use of coordinator node in read?

What are the disadvantages of using Spark?

334

What is difference between spark and kafka?

313

Why is flume used?

Explain the Constituents of Apache ZooKeeper Architecture?

Explain the memtable in cassandra?

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