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 a "map" in Hadoop?

794

What is a "reducer" in Hadoop?

870

what is Speculative Execution?

832

Explain JobConf in MapReduce.

810

What is OutputCommitter?

810

How is reporting controlled in hadoop?

782

What is Hadoop Map Reduce ?

805

what does the text input format do?

815

What happens when a datanode fails ?

778

In Hadoop, which file controls reporting in Hadoop?

774

how can you debug Hadoop code?

838

For a job in Hadoop, is it possible to change the number of mappers to be created?

786

What are the primary phases of a Reducer?

824

how indexing in HDFS is done?

855

What is the role of a MapReduce partitioner?

806

Un-Answered Questions { Hadoop }

Define the level of parallelism and its need in spark streaming?

391

State some disadvantages of impala?

Who uses Cassandra?

Define SSTable?

How Facebook Uses Hadoop, Hive and Hbase ?

707

Tell any two feature Flume?

What is the difference between coalesce and repartition in spark?

317

Explain what is a column family in cassandra?

124

What is difference between a MapReduce InputSplit and HDFS block

676

What are Guarantees provided by Kafka?

523

Hadoop sqoop is which type of tool?

What is pagerank in graphx?

284

What is Replication Factor in Cassandra?

Explain the terms memtable, commitlog and sstables.

Does spark need hadoop?

283

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