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

When to use spark sql?

311

What are the great features of spark sql?

291

Can you explain apache spark?

322

What is apache presto?

Describe REVERSE function in Hive with example?

718

How to Alter Hive Database?

752

When application is on high latency (high response time)?

797

CONCAT function in Hive with Example?

829

Is it possible to create multiple table in hive for same data?

695

UPPER or UCASE function in Hive with example?

807

What is CTAS Table in Hive?

749

How do you write your own custom SerDe ?

746

How will you read and write HDFS files in Hive?

702

Explain ALTER Table statement in Hive?

716

LOWER or LCASE function in Hive with example?

712

Un-Answered Questions { Hadoop }

If DataNode increases, then do we need to upgrade NameNode in Hadoop?

458

Difference between hive and impala?

736

What are the drawbacks of Apache Spark?

317

How does cassandra perform write operations?

What are the major differences between Hadoop 2 and Hadoop 3?

481

Is there another way to check whether Namenode is working?

407

What are core components of Flume?

102

When executing Hive queries in different directories, why is metastore_db created in all places from where Hive is launched?

844

What is crontab? Explain with suitable example?

1067

What is throughput? How does HDFS provide good throughput?

What languages support spark?

292

Explain HCatalog Architecture in Brief?

What are the complex datatypes in pig?

988

What is the relationship between hdfs, hbase, pig, hive and azkaban?

511

What is the difference betwaeen mapreduce engine and hdfs cluster?

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