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

Compare hbase vs hdfs?

Which classes are used by the hive to read and write hdfs files?

Is the hdfs block size reduced to achieve faster query results?

Why does hive not store metadata information in hdfs?

When and how to create hadoop archive?

487

What is the difference between namenode and datanode in hadoop?

539

Ideally what should be the replication factor in hadoop?

488

What is rack awareness in hadoop?

524

While starting hadoop services, datanode service is not running?

486

what happens when namenode goes down during file read operation in hadoop?

641

Why slaves limited to 4000 in hadoop version 1?

535

What is heartbeat in hadoop?

460

Explain small file problem in hadoop

460

How to create the directory when name node is in safe mode?

605

Why can we not create directory /user/dataflair/inpdata001 when name node is in safe mode?

484

Un-Answered Questions { Hadoop }

What is the default file format to import data using Apache Sqoop?

Map reduce jobs are failing on a cluster that was just restarted. They worked before restart. What could be wrong?

645

What are the components of presto architecture?

what daemons run on a master node and slave nodes?

754

What types of costs are associated with creating the index on hive tables?

1065

How to create custom key and custom value in MapReduce Job?

653

Is it necessary to kill the topology while updating the running topology?

626

Explain pigdump function?

654

How to load data into table created in hive ?

745

Why should we use presto?

Why is HDFS only suitable for large data sets and not the correct tool to use for many small files?

What is spark tool?

279

Explain InputSplit in Hadoop?

502

Define the term thrift

138

What is a dstream in apache spark?

2049

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