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

how is a file of the size 1 GB uncompressed

878

Is map like a pointer?

879

What is the default replication factor?

949

What should be the ideal replication factor in Hadoop Cluster?

2 2997

How can one increase replication factor to a desired value in Hadoop?

1085

In Map Reduce why map write output to Local Disk instead of HDFS?

876

What is a Record Reader in hadoop?

914

What is version-id mismatch error in hadoop?

1020

how to share the metastore within multiple users?

877

What is a partitioner and how the user can control which key will go to which reducer?

898

Hive for Hadoop - Give some points?

1 1969

How do you define "block" in HDFS?

860

Where is the Mapper Output intermediate kay-value data stored ?

1315

How does Mappers run method works?

846

What are the components of Apache Pig platform?

716

Un-Answered Questions { Hadoop }

Does spark store data?

270

What is the problem in having lots of small files in hdfs?

What is dataframe in spark?

266

What is the heartbeat used for?

1004

What are "coordinator nodes" in cassandra?

What is the Reducer used for?

893

What is keyspace in Cassandra?

What do you understand by Pair RDD?

375

Explain distnct(),union(),intersection() and substract() transformation in Spark?

308

What are the differences between hadoop 1 and hadoop 2?

399

Can you explain apache ambari?

On what basis name node distribute blocks across the data nodes?

1009

What is sparkContext?

275

What are the various data sources available in SparkSQL?

323

How can one set space quota in Hadoop (HDFS) directory?

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