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?

243

Is it possible to share data files between different components?

Does if offer scaling?

Is there a dual table?

Un-Answered Questions { Hadoop }

Explain process to access sub directories recursively in hive queries.

908

What happens to job tracker when namenode is down?

689

In MapReduce, ideally how many mappers should be configured on a slave?

673

how to proceed to write your first mapreducer program?

1352

What is a hive on spark?

301

what job does the conf class do?

803

Explain slot in Hadoop Map-Reduce v1?

696

What is the relationship between Jobs and Tasks in Hadoop?

622

What is Mapper in Hadoop?

564

What is a "reducer" in Hadoop?

879

If we want to copy 10 blocks from one machine to another, but another machine can copy only 8.5 blocks, can the blocks be broken at the time of replication?

681

Mention what daemons run on a master node and slave nodes?

475

What is the difference between sort by and order by in hive?

692

What happen if the number of the reducer is 0 in MapReduce?

657

What operations does rdd support?

278

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