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

Compare hbase vs hdfs?

Which classes are used by the hive to read and write hdfs files?

Is the hdfs block size reduced to achieve faster query results?

Why does hive not store metadata information in hdfs?

When and how to create hadoop archive?

485

What is the difference between namenode and datanode in hadoop?

536

Ideally what should be the replication factor in hadoop?

478

What is rack awareness in hadoop?

522

While starting hadoop services, datanode service is not running?

483

what happens when namenode goes down during file read operation in hadoop?

639

Why slaves limited to 4000 in hadoop version 1?

533

What is heartbeat in hadoop?

456

Explain small file problem in hadoop

456

How to create the directory when name node is in safe mode?

601

Why can we not create directory /user/dataflair/inpdata001 when name node is in safe mode?

482

Un-Answered Questions { Hadoop }

how can you check whether Namenode is working beside using the jps command?

725

What is mapreduce algorithm?

640

Are sparks dangerous?

358

Where are Hadoop’s configuration files located?

545

What is Geo-Replication in Kafka?

915

What is Text Input Format?

711

What is salting in spark?

434

What is the use of combiners in the hadoop framework?

649

How can you configur the log cleaner?

595

What is the abstraction of Spark Streaming?

275

How to delete the table with the HBase shell?

153

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

149

What is distributed cache in spark?

364

List Hadoop’s three configuration files?

454

How to add/delete a Node to the existing cluster?

567

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