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 RecordReader in a Map Reduce?

654

Define Writable data types in MapReduce?

679

What happens when a DataNode fails during the write process?

643

Compare RDBMS with Hadoop MapReduce.

638

what is a Task Tracker in Hadoop?

707

what are the most common input formats defined in Hadoop?

643

what daemons run on a master node and slave nodes?

707

What is Text Input Format?

682

what is WebDAV in Hadoop?

737

What platform and Java version is required to run Hadoop?

650

what are the three modes in which Hadoop can be run?

632

How data is spilt in Hadoop?

649

what is storage and compute nodes?

741

When Namenode is down what happens to job tracker?

702

what are the main configuration parameters that user need to specify to run Mapreduce Job ?

604

Un-Answered Questions { Hadoop }

What is the purpose of dfsadmin tool?

1251

Give some points of pig for hadoop ?

555

What is spark executor cores?

293

Data node block size in HDFS, why 64MB?

what are the main components of cassandra data model?

Is hive similar to sql?

734

State one best feature of Kafka?

516

What are the restriction to the key and value class ?

433

How to invoke Command Line Interface?

Does spark need hdfs?

291

Explain the Methods Of ZooKeeper class?

How does gossip protocol help in failure detection?

Can we say a COGROUP is a group of more than 1 data set?

555

Why should I use spark?

305

How data transfer happens from HDFS to Hive?

825

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