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?

195

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

157

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 }

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

1726

What is difference between dataset and dataframe in spark?

328

What are partitions and tokens in cassandra?

Explain the Scope operators used in hbase?

186

How is hadoop different from spark?

284

What is the function of consistency cqlsh command in Cassandra?

What is NameNode and DataNode in HDFS?

What are the uses of explode hive?

771

Mention the common features in Pig and Hive?

947

If datanodes increase, then do we need to upgrade namenode?

517

Say when to pick “inward table” and “outside table” in hive?

754

Which command is available to show the current HBase user?

167

What is Partition table in Hive?

772

What is difference between flume and sqoop?

200

What are the 2 modes used to run pig scripts?

649

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