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

When would you use hbase?

178

What are the filters are available in apache hbase?

155

How do we back up a hbase cluster?

143

What are the data manipulation commands of hbase?

201

Explain data versioning?

178

While reading data from hbase, from which three places data will be reconciled before returning the value?

198

Which command is used to show the current hbase user?

192

How does bloom filter help in searching rows?

219

Explain the data model of hbase.

165

How hbase handles the write failure?

208

Define column families?

171

Which code is used to open a connection in hbase?

265

What is the role of the offset.

520

What is the role of the kafka producer api.

532

Explain the main difference between kafka and flume?

619

Un-Answered Questions { Hadoop }

What is Safemode in Apache Hadoop?

746

How can you see the list of stored jobs in sqoop metastore?

How do you write your own SerDe?

777

How will you calculate the number of executors required to do real-time processing using Apache Spark? What factors need to be considered for deciding on the number of nodes for real-time processing?

291

To use Spark on an existing Hadoop Cluster, do we need to install Spark on all nodes of Hadoop?

358

What is difference between cache and persist in spark?

279

Differentiate between drop and truncate in cqlsh

Name the examples of some companies that are using hadoop structure?

698

What is the use of flatmap in spark?

287

Are multiline comments supported in Hive?

3291

How do sparks work?

350

Explain the flatMap operation on Apache Spark RDD?

318

How can hive avoid mapreduce?

711

What is the use of “void close()” method?

Why is block size set to 128 MB in HDFS?

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