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

Are there any special requirements for namenode?

463

is there a standard procedure to deploy hadoop?

465

What happen if a datanode loses network connection for a few minutes?

647

What is the procedure for namenode recovery?

495

How would an hadoop administrator deploy various components of hadoop in production?

461

What happen if one of the datanodes has much slower cpu?

476

After increasing the replication level, I still see that data is under replicated. What could be wrong?

513

Web-ui shows that half of the datanodes are in decommissioning mode. What does that mean? Is it safe to remove those nodes from the network?

490

What is the difference between a hadoop database and relational database?

496

Can we deploye job tracker other than name node?

702

What is difference between secondary namenode, checkpoint namenode & backupnode?

508

Name the most common input formats defined in hadoop?

485

Which one is default?

530

Is it possible to have hadoop job output in multiple directories?

478

What is tasktracker in hadoop?

475

Un-Answered Questions { Hadoop }

Why HDFS performs replication, although it results in data redundancy in Hadoop?

List commonly used machine learning algorithm?

300

How to change Replication Factor For below cases ?

1155

Why is Reading done in parallel and writing is not in HDFS?

What is the default extension of the files produced from a sqoop import using the –compress parameter?

Explain the key features of hdfs?

Can I set the number of reducers to zero?

436

Which code is used to open a connection in hbase?

267

How to set which framework would be used to run mapreduce program?

756

How can one write custom record reader?

532

How does Cassandra perform write function?

How will you convert the string ’51.2’ to a float value in the price column?

928

What is rdd lineage graph? How is it useful in achieving fault tolerance?

322

Use of import command in hadoop sqoop?

What are the different tasks we can perform managing host using ambari host tab?

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