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

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

Can multiple clients write into a Hadoop HDFS file concurrently?

On what basis name node distribute blocks across the data nodes in HDFS?

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

Can multiple clients write into an HDFS file concurrently in hadoop?

How to create Users in hadoop HDFS?

How to transfer data from Hive to HDFS?

Why HDFS stores data using commodity hardware despite the higher chance of failures in hadoop?

What is Hadoop Distributed File System- HDFS?

What is throughput in HDFS?

how you can reduce churn in ISR? When does broker leave the ISR?

628

Enlist all Apache Kafka Operations?

564

State Disadvantages of Apache Kafka?

625

Explain some Kafka Streams real-time Use Cases?

532

what is Zookeeper in Kafka? Can we use Kafka without Zookeeper?

560

Un-Answered Questions { Hadoop }

What is the default replication factor in Hadoop and how will you change it?

599

What are file permissions in HDFS and how HDFS check permissions for files or directory?

Tell any two feature Flume?

What is spark vs scala?

269

The partition of hive table has been modified to point to a new directory location. Do I have to move the data to the new location or the data will be moved automatically to the new location?

1011

What are the functionalities of jobtracer?

415

What is key-value store db?

Why aggregation cannot be done in Mapper?

567

List the advantage of Parquet files?

301

Can Hadoop be compared to NOSQL database like Cassandra?

920

What are transformations in spark?

307

Explain the use of .mecia class?

793

What are Paired RDD?

315

Is it possible to leverage real time analysis on the big data collected by flume directly? If yes, then explain how?

What does conf.setmapper class do?

679

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