Amazon EMR is a cloud based big data platform. EMR helps creating Hadoop cluster to analyse and process vast amount of data. The cluster can be made of hundreds of EC2 instances work together to analyse data. EMR provisions those instances and configure them for workloads. It can auto scale instances and integrated with Spot instances. EMR supports many popular frameworks such as Apache Hadoop, Apache Spark, and Apache Hive.
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Reference - Udemy Ultimate AWS Certified Cloud Practitioner CLF-C02