Big Data Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Big Data Interview Questions

Questions Answers Views Company eMail

Describe HDFS Federation?

What is active and passive NameNode in HDFS?

234

Does HDFS allow a client to read a file which is already opened for writing in hadoop?

How data or file is read in Hadoop HDFS?

How HDFS helps NameNode in scaling in Hadoop?

What is Fault Tolerance in Hadoop HDFS?

How can one copy a file into HDFS with a different block size to that of existing block size configuration?

What is a Block Scanner in HDFS?

101

Differentiate HDFS & HBase?

How data or file is written into Hadoop HDFS?

In HDFS, how Name node determines which data node to write on?

What is Secondary NameNode in Hadoop HDFS?

How to restart NameNode or all the daemons in Hadoop HDFS?

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

Can multiple clients write into a Hadoop HDFS file concurrently?

Un-Answered Questions { Big Data }

State one best feature of Kafka?

575

Mention some basic tajo shell commands?

How to create a custom key and custom value in MapReduce Job?

730

What is memtable?

110

how does hdfs ensure data integrity of data blocks stored in hadoop hdfs?

How can you send some messages in kafka?

549

How to submit extra files(jars,static files) for MapReduce job during runtime in Hadoop?

826

What do you understand by Kundera?

What is accumulators and broadcast variables in spark?

339

Explain how are file systems checked in hdfs?

How to optimize MapReduce Job?

701

Define paired RDD in Apache Spark?

294

What do you mean by data locality?

730

Which one will you decide for an undertaking – Hadoop MapReduce or Apache Spark?

663

Who developed Apache Avro?

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