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?

1172

What is the Job interface in MapReduce framework?

907

What is the problem with HDFS and streaming data like logs

1022

What is the Use of SSH in Hadoop ?

959

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

1004

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

1076

What is Schema on Read and Schema on Write?

916

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

MRO,

1092

Write a Pig UDF Example ?

767

What is the difference between traditional RDBMS and Hadoop?

1171

What is the main purpose of HDFS fsck command?

1792

What is safe mode in Hadoop?

961

Detail description of the Reducer phases?

852

What is MapFile?

964

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

1231

Un-Answered Questions { Hadoop }

What is the relationship between Hadoop, HBase, Hive and Cassandra ?

147

Can ambari manage multiple clusters and why?

What is active and passive NameNode in HDFS?

228

Is HDFS utilized in Cassandra? If yes, where?

Why do we need spark?

278

What does map transformation do? Provide an example.

316

What is a 'block' in HDFS?

976

what does /*streamtable(table_name)*/ do?

777

What are the log files of the presto server?

What size is recommended for each node?

214

Can you explain how to minimize data transfers while working with Spark?

539

What is pagerank in graphx?

284

What is the man difference between hbase and hive?

669

How is a keyspace created in cassandra?

124

What is HBase HMaster?

360

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