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Hadoop Interview Questions
Questions Answers Views Company eMail

What is IdentityMapper?

 641

Why do we use Hadoop?

 634

what is the typical block size of an HDFS block?

 646

What is Hadoop Custom partitioner ?

 725

What is the default block size in Hadoop 1 and in Hadoop 2? Can it be changed?

 947

What stored in HDFS?

 617

What is crontab? Explain with suitable example?

 673

What is the difference between Hadoop and Traditional RDBMS?

 669

What is Partioner in hadoop? Where does it run

 624

Does Hadoop requires RAID?

 651

What is the purpose of DataNode block scanner?

 663

What is a checkpoint?

 665

Did you ever ran into a lop sided job that resulted in out of memory error

 930

What is the communication channel between client and namenode/datanode?

 1420

What are the different operational commands in HBase at record level and table level?

 309

Un-Answered Questions { Hadoop }

What are possible types of Channel Selectors?

76

Define the purpose of the partition function in mapreduce framework

410

How to change the column data type in hive? Explain rlike in hive.

426

Which among the two is preferable for the project- Hadoop MapReduce or Apache Spark?

349

how to share the metastore within multiple users?

623




How to create a custom key and custom value in MapReduce Job?

400

Explain what is sequencefileinputformat?

237

What is spark repartition?

197

Explain the concept of Tunable Consistency in Cassandra?

180

What happens when you issue a delete command in hbase?

125

What is Cassandra Query Language?

64

What is pair rdd?

208

How does Hadoop Classpath plays a vital role in stopping or starting in Hadoop daemons?

461

What is a MapReduce Combiner?

510

What is meant by streaming access?

282

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