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 impala’s aggregation strategy?

What does impala do for fast access?

How is impala metadata managed?

What size is recommended for each node?

214

What impala use for authentication?

Can impala do user-defined functions (udfs)?

What is used to store data generally?

State use cases of impala?

How do I load a big csv file into a partitioned table?

How does impala process join queries for large tables?

Can I do insert … select * into a partitioned table?

What happens if there is an error in impala?

259

Is it possible to share data files between different components?

Does if offer scaling?

Is there a dual table?

Un-Answered Questions { Hadoop }

What is accumulator in spark?

511

How to set mappers and reducers for Hadoop jobs?

664

What is the use of exists command?

248

What is difference between map and flatmap in spark?

342

Is JDBC driver enough to connect sqoop to the databases?

How Apache Pig deals with the schema and schema-less data?

620

What do you mean by the NameNode High Availability in hadoop?

533

What is lazy evaluation in Spark?

331

What is Hadoop Custom partitioner ?

1047

What is HBase Shell?

176

Can you define what is Event Serializer in Flume?

Explain how is data partitioned before it is sent to the reducer if no custom partitioner is defined in hadoop?

482

What is heap memory in spark?

281

Mention if we can name view same as the name of a Hive table?

726

It can be possible that a Job has 0 reducers?

1013

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