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?

444

What is the difference between namenode and datanode in hadoop?

495

Ideally what should be the replication factor in hadoop?

426

What is rack awareness in hadoop?

487

While starting hadoop services, datanode service is not running?

439

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

593

Why slaves limited to 4000 in hadoop version 1?

487

What is heartbeat in hadoop?

426

Explain small file problem in hadoop

421

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

547

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

449

Un-Answered Questions { Hadoop }

What does apache spark stand for?

281

What is shuffleing in mapreduce?

648

What are some alternatives to apache kafka?

562

What is a broker?

514

What is the difference between input split and hdfs block?

What is ObjectInspector functionality?

825

How does spark run hadoop?

284

Can you explain benefits of spark over mapreduce?

289

What is the difference between Internal Table and External Table in Hive?

726

What is key-value store db? Explain with an example.

What is the difference between Input Split and an HDFS Block?

What do you understand by SchemaRDD?

315

Define data integrity?

What are the components of a Hive query processor?

732

What is "GraphX" in Spark?

300

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