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

Big Data Interview Questions

Questions Answers Views Company eMail

Why is Data Block size set to 128 MB in Hadoop?

237

What is a Heartbeat in Hadoop?

303

Comparison between Secondary NameNode and Checkpoint Node in Hadoop?

272

What is a Backup node in Hadoop?

255

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

252

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

282

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

1030

What is Balancer in Hadoop?

216

What is active and passive NameNode in Hadoop?

247

How can one check whether NameNode is working or not?

271

How would you restart NameNode?

215

How NameNode tackle Datanode failures in Hadoop?

236

Is Namenode machine same as DataNode machine as in terms of hardware in Hadoop?

245

If DataNode increases, then do we need to upgrade NameNode in Hadoop?

240

What is meant by streaming access?

282

Un-Answered Questions { Big Data }

Why do we need indexing?

425

Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?

382

What does dag stand for?

199

Can we say cogroup is a group of more than 1 data set?

446

Differentiate Reducer and Combiner in Hadoop MapReduce?

410

What are the differences between hadoop 1 and hadoop 2?

237

Explain when to use explode in Hive?

424

Specify what the information segments utilized by hadoop are?

236

Why is flume used?

Explain about the partitioning, shuffle and sort phase

388

Does impala support generic jdbc?

Why should we use presto?

What is kafka Producer?

333

Can any impala query also be executed in hive?

Explain HCatInputFormat and HCatOutputFormat?

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