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 are the restriction to the key and value class ?

463

If we want to copy 10 blocks from one machine to another, but another machine can copy only 8.5 blocks, can the blocks be broken at the time of replication?

715

If datanodes increase, then do we need to upgrade namenode?

515

Which object can be used to get the progress of a particular job

515

Give me examples of unstructured data?

523

Explain the core methods of the reducer?

544

How to handle bad records during parsing?

487

What is the use of context object?

504

What happens if number of reducers are 0?

507

What are the primary phases of the reducer?

487

what is next step after mapper or maptask?

455

What is a rack?

460

Do we require two servers for the namenode and the datanodes?

556

We have already sql then why nosql?

470

What is difference between reducer and combiner?

615

Un-Answered Questions { Hadoop }

In ambari what are the different life cycle commands?

Define the common faults of the developer while using apache spark?

306

How many instances of JobTracker can run on a Hadoop Cluser?

1051

Why are Replications critical in Kafka?

609

Hdfs stores data using commodity hardware which has higher chances of failures. So, how hdfs ensures the fault tolerance capability of the system?

What is the difference between Input Split and an HDFS Block?

What do you understand by cassandra?

Is avro supported?

What are the features of Pseudo mode?

546

How to process data using Transformation operation in Spark?

318

What is number of executors in spark?

306

What is mandatory while creating a table in cassandra?

What is Client API?

287

What is fluming?

161

What is the use of cloudera?

483

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