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

Big Data Interview Questions

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How one can change Replication factor when Data is already stored in HDFS

Explain HDFS “Write once Read many” pattern?

Why is block size set to 128 MB in HDFS?

What should be the HDFS Block size to get maximum performance from Hadoop cluster?

What is the importance of dfs.namenode.name.dir in HDFS?

How one can format Hadoop HDFS?

Explain what happens if, during the PUT operation, HDFS block is assigned a replication factor 1 instead of the default value 3?

How to format the HDFS? How frequently it will be done?

Which one is the master node in HDFS? Can it be commodity hardware?

What happens if the block on Hadoop HDFS is corrupted?

What is a block in HDFS, why block size 64MB?

How NameNode tackle Datanode failures in HDFS?

How is indexing done in Hadoop HDFS?

How to perform the inter-cluster data copying work in HDFS?

What are the main properties of hdfs-site.xml file?

Un-Answered Questions { Big Data }

Why do we need Hadoop Archives? How is it created?

571

How will you backup an HBase cluster?

144

What is apache presto?

What do you mean by the NameNode High Availability in hadoop?

503

Apache Spark is a good fit for which type of machine learning techniques?

282

What is Apache Avro?

What is Purpose to Validate in Sqoop?

What is the default block size in hdfs?

1049

What are the hadoop's three configuration files?

706

Explain avrostorage function?

632

How HDFS helps NameNode in scaling in Hadoop?

What is Cassandra-Cqlsh?

129

How to start hbase services?

212

What is the Job interface in MapReduce framework?

916

Describe REVERSE function in Hive with example?

721

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