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

Can you define sqoop in hadoop?

How do you do a file system check in hdfs?

What is the difference between an input split and hdfs block?

114

What are problems with small files and hdfs?

Can you explain heartbeat in hdfs?

Can you define a block and block scanner in hdfs?

Can you explain about the indexing process in hdfs?

Can you explain apache kafka?

563

Which are the elements of kafka?

637

What is the inputsplit in map reduce software?

678

Map reduce jobs take too long. What can be done to improve the performance of the cluster?

755

Map reduce jobs are failing on a cluster that was just restarted. They worked before restart. What could be wrong?

647

Is apache spark going to replace hadoop?

376

What are the advantage of spark?

302

What is the disadvantage of spark sql?

381

Un-Answered Questions { Hadoop }

List the benefits of Spark over MapReduce.

310

What is used to store data generally?

What other technologies have you used in hadoop sta ck?

1020

Explain HCatStorer APIs?

You have a file personal_data.txt in the HDFS directory with 100 records. You want to see only the first 5 records from the employee.txt file. How will you do this?

838

What is executor memory and driver memory in spark?

298

Explain HCatOutputFormat?

While writing evaluate UDF, which method has to be overridden?

608

Can a partition be archived? What are the advantages and Disadvantages?

809

Do streamers make money from sparks?

292

How many compaction types are in HBase?

185

Virtual Box & Ubuntu Installation?

1048

Explain api create or replace tempview()?

351

Explain first() operation in Apache Spark?

315

What are the relational operators available related to loading and storing in pig language?

665

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