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

Is kafka an etl tool?

265

What language is apache kafka written in?

288

What is zookeeper server?

What is the difference between map and reduce?

352

What is optimal size of a file for distributed cache?

374

What can skew the mean?

189

What is vectorized query execution?

217

What is map side join?

187

What does dag stand for?

203

What is data ingestion pipeline?

188

What is the difference between reducebykey and groupbykey?

201

What is data skew and how do you fix it?

215

Is databricks a database?

217

Is databricks an etl tool?

194

What is a databricks cluster?

281

Un-Answered Questions { Hadoop }

What is the difference between persist() and cache()?

221

Explain cassandra data model?

What is Internal and External table in Hive?

442

What are use cases of Apache Flume?

Is there any point of learning mapreduce, then?

394

What is SparkContext in Apache Spark?

214

What are the data manipulation commands of hbase?

141

Explain the terms memtable, commitlog and sstables.

What happens to a NameNode that has no data?

1262

what is a sequence file in Hadoop?

413

Why should we use presto?

What is a Heartbeat in Hadoop?

305

Define memtable?

What is a rack awareness algorithm and why is it used in hadoop?

What is the relationship between apache hadoop, hbase, hive and cassandra?

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