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

Explain a simple Map/Reduce problem.

Capital One,

784

Data Engineer Given a list of followers in the format:123, 345234, 678345, 123â€¦Where column one is the ID of the follower and column two is the ID of the followee. Find all mutual following pairs (the pair 123, 345 in the example above). How would you use Map/Reduce to solve the problem when the list does not fit in memory?

Twitter,

780

How would you use Map/Reduce to split a very large graph into smaller pieces and parallelize the computation of edges according to the fast/dynamic change of data?

Twitter,

729

Write a Hive UDF that returns a sentiment score. For example, if good = 1, bad = -1, and average = 0, then a review of a restaurant states "Good food, bad service," your score might be 1 - 1 = 0.

LinkedIn,

727

Explain how RDDs work with Scala in Spark

Capital One,

350

Define HRegionServer in HBase

161

What is the use of shutdown command?

214

What is HBase HMaster?

362

What is the function of HMaster?

271

Suppose that your data is stored in collections, for instance, some binary data, message data or metadata is all keyed on the same value. Will you use HBase for this?

162

Explian the Limitations of HBase?

199

State some applications of HBase?

173

What is a Column family in hbase?

200

Discuss about the different tombstone markers used for deletion purposes in HBase.?

191

Explain the Scope operators used in hbase?

186

Un-Answered Questions { Hadoop }

What is zookeper?

Explain the Features of HBase?

217

Give any two features of flume?

102

Name different elements of JConsole?

What is a table generating function on hive?

761

What are the different tasks we can perform managing host using ambari host tab?

What is a block?

Define data replication?

What happens to job tracker when namenode is down?

722

Explain count_star?

612

How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?

658

Difference between mapreduce and spark

736

What is the full form of MSLAB?

231

What is Fault Tolerance in Hadoop HDFS?

What bit version ambary needs and list out the operating system that are compatible?

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