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

How is NFS different from HDFS?

Why is block size large in Hadoop?

Distinguish HDFS Block and Input Unit?

What are the difference between of the “HDFS Block” and “Input Split”?

What happens when two users try to access to the same file in HDFS?

Does the HDFS go wrong? If so, how?

Why is HDFS only suitable for large data sets and not the correct tool to use for many small files?

What happens when two clients try to access the same file on HDFS?

185

What are the different file permissions in the HDFS for files or directory levels?

146

How to read file in HDFS?

When NameNode enter in Safe Mode?

Write command to copy a file from HDFS to linux(local).

How to create directory in HDFS?

How to Delete directory from HDFS?

What are the main features of hdfssite.xml?

Un-Answered Questions { Hadoop }

Is spark good for machine learning?

306

Explain what happens in text format?

573

How does master slave architecture in the hadoop?

815

How to perform the inter-cluster data copying work in HDFS?

Name the languages which are supported by apache spark and which one is most popular?

279

Is it possible to use Apache Spark for accessing and analyzing data stored in Cassandra databases?

304

What is the reason of using hbase?

187

What are the main hdfs-site.xml properties?

When to avoid secondary indexes?

What is Buckets in Hive?

745

What are the benefits/ advantages of Cassandra?

Why hive does not store metadata information in hdfs?

939

What is the functionality of jobtracker in hadoop? How many instances of a jobtracker run on hadoop cluster?

783

Do we need to give a password, even if the key is added in ssh?

727

Does HBase support SQL like syntax?

153

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