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

What is the difference between Gen1 and Gen2 Hadoop with regards to the Namenode?

1123

What is the Job interface in MapReduce framework?

862

What is the problem with HDFS and streaming data like logs

968

What is the Use of SSH in Hadoop ?

920

What infrastructure do we need to process 100 TB data using Hadoop?

955

What is the difference between a Hadoop and Relational Database and Nosql?

1026

What is Schema on Read and Schema on Write?

863

How to overwrite an existing output file during execution of mapreduce jobs?

MRO,

1048

Write a Pig UDF Example ?

722

What is the difference between traditional RDBMS and Hadoop?

1127

What is the main purpose of HDFS fsck command?

1718

What is safe mode in Hadoop?

901

Detail description of the Reducer phases?

810

What is MapFile?

926

What do you understand from Node redundancy and is it exist in hadoop cluster?

1184

Un-Answered Questions { Hadoop }

What is job tracker in Hadoop?

459

If you run hive as a server, what are the available mechanism for connecting it from application?

847

What is an "RDD Lineage"?

276

How to enable trash/recycle bin in hadoop?

685

Can we run Apache Spark without Hadoop?

277

Can we submit the mapreduce job from slave node?

1051

Explain reduceByKey() Spark operation?

281

What is hdfs block size?

Explain keys() operation in Apache spark?

314

Give any two features of flume?

What is spark sqlcontext?

281

What are the hadoop's three configuration files?

637

Differentiate between the physical plan and logical plan in Pig script?

722

What is data skew and how do you fix it?

311

How should 'load' keyword is useful in pig scripts?

489

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