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

Big Data Interview Questions

Questions Answers Views Company eMail

What is the role of alter keyspace?

What is hadoop, hbase, hive and cassandra? Specify similarities and differences among them.

126

Explain cassandra.

Where cassandra stores its data?

What do you mean by cassandra-cqlsh?

What is a mapreduce algorithm?

638

What is mapreduce algorithm?

588

What is hdfs block size?

How hdfs is different from traditional file systems?

How is hdfs block size different from traditional file system block size?

When the reducers are are started in a mapreduce job?

595

Where the mapper's intermediate data will be stored?

638

Which are the methods in the mapper interface?

634

What is a namenode? How many instances of namenode run on a hadoop cluster?

643

What do you mean by taskinstance?

746

Un-Answered Questions { Big Data }

How do I change hive execution engine to spark?

301

What is the function of mapreduce partitioner?

639

How do you define "block" in HDFS?

898

Define partitioning key?

483

What is apache spark engine?

298

What do you mean by schema on reading?

713

What apache spark is used for?

252

Explain the lookup() operation in Spark?

231

How data or file is written into HDFS?

Can you explain accumulators in apache spark?

309

How to handle record boundaries in Text files or Sequence files in MapReduce InputSplits?

699

how is data partitioned before it is sent to the reducer if no custom partitioner is defined in Hadoop?

782

What is driver and executor in spark?

313

What is python stress test in cassandra?

How to identify that the given operation is transformation or action?

277

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