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 ?

466

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?

718

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

515

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

517

Give me examples of unstructured data?

525

Explain the core methods of the reducer?

546

How to handle bad records during parsing?

489

What is the use of context object?

506

What happens if number of reducers are 0?

509

What are the primary phases of the reducer?

489

what is next step after mapper or maptask?

459

What is a rack?

462

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

558

We have already sql then why nosql?

471

What is difference between reducer and combiner?

615

Un-Answered Questions { Hadoop }

When is the reducers are started in a MapReduce job?

920

How to enable recycle bin in hadoop?

800

Is spark a language?

295

What are the Data extraction tools in Hadoop?

Why should we use ‘orderby’ keyword in pig scripts?

581

In which language ambari shell is developed?

What are the basics of zookeeper api?

Define a daemon?

716

What is spark pipeline?

299

Explain SparkContext in Apache Spark?

346

What are durable writes?

104

Name a few import control commands. How can Sqoop handle large objects?

How do you list all databases whose name starts with p?

744

how Cassandra delete Data?

114

What do you understand by cassandra?

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