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 the difference between Input Split and an HDFS Block?

What is NameNode and DataNode in HDFS?

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

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

How data or file is written into HDFS?

What is throughput? How does HDFS get a good throughput?

What is the benifit of Distributed cache, why can we just have the file in HDFS and have the application read it?

List the various HDFS daemons in HDFS cluster?

What is the difference between NAS and HDFS?

If data is present in HDFS and RF is defined, then how can we change Replication Factor?

What do you mean by metadata in HDFS? Where is it stored in Hadoop?

What is the optimal block size in HDFS?

What do you mean by metadata in HDFS?

Data node block size in HDFS, why 64MB?

What happens if the block in HDFS is corrupted?

Un-Answered Questions { Hadoop }

What are clusters in cassandra?

Can you give us some examples, how Hadoop is used in real time environment?

705

Can you explain accumulators in apache spark?

309

How to change Replication Factor For below cases ?

1094

What is difference between map and flatmap?

298

List the various options available with the Hive command?

909

What does block mean?

446

What is the use of spark driver, where it gets executed on the cluster?

370

Why is Apache Spark faster than Hadoop MapReduce?

659

Explain what are the various types of Transformation on DStream?

282

What is BloomMapFile?

743

what is Speculative Execution?

838

is it necessary to install Spark on all nodes while running Spark application on Yarn?

303

What is the NameNode port number?

400

Explain hbasestorage function?

603

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