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 Fault Tolerance in HDFS?

What is the procedure to create users in HDFS and how to allocate Quota to them?

How does a client read/write data in HDFS?

What is the difference between MapReduce engine and HDFS cluster?

106

Explain NameNode and DataNode in HDFS?

How data or file is read in HDFS?

How is indexing done in HDFS?

What alternate way does HDFS provides to recover data in case a Namenode, without backup, fails and cannot be recovered?

Why HDFS performs replication, although it results in data redundancy?

146

Why ‘Reading‘ is done in parallel and ‘Writing‘ is not in HDFS?

What are the key features of HDFS?

How can one set space quota in Hadoop (HDFS) directory?

Explain how HDFS communicates with Linux native file system?

If I create a folder in HDFS, will there be metadata created corresponding to the folder? If yes, what will be the size of metadata created for a directory?

Replication causes data redundancy then why is is pursued in HDFS?

Un-Answered Questions { Hadoop }

What is a primary key? And what are it’s different types?

Clarify Memtable?

Mention the difference between hbase and relational database?

172

What is interactive mode in apache pig?

585

Explain JobConf in MapReduce.

854

What is map/reduce job in hadoop?

678

What do sorting and shuffling do?

748

Explain the term 'Topic Replication Factor'?

566

Why Mapper runs in heavy weight process and not in a thread in MapReduce?

683

What is the communication channel between client and namenode/datanode?

1771

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

1112

What does hadoop-env.sh do?

485

Why Flume?

182

Explain the functionalities of ganglia in ambari?

What is difference between hive and spark?

283

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