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

Define data integrity? How does hdfs ensure data integrity of data blocks stored in hdfs?

What is a rack awareness algorithm and why is it used in hadoop?

What is a block?

What is throughput? How does hdfs provides good throughput?

Replication causes data redundancy and consume a lot of space, then why is it pursued in hdfs?

Define hadoop archives? What is the command for archiving a group of files in hdfs.

What do you mean by the high availability of a namenode?

What is the difference between nas (network attached storage) and hdfs?

What is a rack awareness algorithm?

What is the problem in having lots of small files in hdfs?

Why rack awareness algorithm is used in hadoop?

Can you change the block size of hdfs files?

What is an identity mapper and identity reducer?

665

What are the advantages of using mapreduce with hadoop?

639

What do you know about nlineinputformat?

742

Un-Answered Questions { Hadoop }

How many partitions are created by default in Apache Spark RDD?

319

Can you define pagerank?

304

What is spark sqlcontext?

312

what is Speculative Execution?

890

What operations does the "RDD" support?

313

How can you stop a partition form being queried?

810

Compare MapReduce and Spark?

310

Mention what is the hadoop mapreduce apis contract for a key and value class?

733

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

725

How many Daemon processes run on a Hadoop system?

1136

Name the most common input formats defined in hadoop?

481

Is spark better than mapreduce?

289

How will you write a custom partitioner for a Hadoop job?

498

What is 'jps'?

470

Can you explain how it is different from doing machine learning in r or sas?

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