What is HDInsight architecture in Azure?

Azure HDInsight architecture

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At Microsoft

Components of Apache Hadoop on HDInsight are documented here

Hortonworks Data Platform

yarn - Distributing work

Tez

Pig - Scripting for bigdata ETL

Hive, HiveCatalog (HCatalog) - SQL for Bigdata

Tez, Hive2

Ranger - Security

Hbase - Columnr tables

Sqoop - To load SQL data from relational tables

OOzie - scheduler

Zookeeper - Distributed Coordination

Storm - Message processing

Mahout

Phoenix

Spark

Livy

Kafka - messaging

Ambari

Zeppelin

Mono