# AWS EMR optimization | Cloud Efficiency Hub Canonical: https://www.pointfive.co/efficiency-hub/cloud-services/aws-emr 3 documented AWS EMR cost inefficiencies, each with how to detect it and how to fix it. [Cloud Efficiency Hub](https://www.pointfive.co/efficiency-hub) 3 documented AWS EMR cost inefficiencies, each with how to detect it and how to fix it. ## 3 inefficiencies [All services](https://www.pointfive.co/efficiency-hub#browse-by-service) - AWS EMR CER-0057 ### [Idle EMR Cluster Without Auto-Termination Policy](https://www.pointfive.co/efficiency-hub/inefficiencies/idle-emr-cluster-without-auto-termination-policy) Amazon EMR clusters often run on large, multi-node EC2 fleets, making them costly to leave running unnecessarily. If a cluster becomes idle-no longer processing jobs - but is not terminated, it continues accruing EC2 and EMR service... Compute - AWS EMR CER-0395 ### [On-Demand Task Nodes in EMR Clusters](https://www.pointfive.co/efficiency-hub/inefficiencies/on-demand-task-nodes-in-emr-clusters) Amazon EMR task nodes run processing work but do not store persistent data in HDFS. If a task node running on a Spot Instance is interrupted, no data is lost and the effect on the cluster is minimal, which is why the EMR guidelines list... Compute - AWS EMR CER-0396 ### [EMR Clusters Without Managed Scaling](https://www.pointfive.co/efficiency-hub/inefficiencies/emr-clusters-without-managed-scaling) Long-running Amazon EMR clusters are often provisioned with a fixed number of core and task nodes sized for the heaviest job or the busiest time of day. Between peaks, all of those nodes keep running and billing even when YARN has little... Compute ## More AWS services - [AWS EC2 23](https://www.pointfive.co/efficiency-hub/cloud-services/aws-ec2) - [AWS RDS 19](https://www.pointfive.co/efficiency-hub/cloud-services/aws-rds) - [AWS S3 15](https://www.pointfive.co/efficiency-hub/cloud-services/aws-s3) - [AWS Lambda 12](https://www.pointfive.co/efficiency-hub/cloud-services/aws-lambda) - [AWS EBS 10](https://www.pointfive.co/efficiency-hub/cloud-services/aws-ebs) - [AWS CloudWatch 8](https://www.pointfive.co/efficiency-hub/cloud-services/aws-cloudwatch) - [AWS EKS 8](https://www.pointfive.co/efficiency-hub/cloud-services/aws-eks) - [AWS ElastiCache 8](https://www.pointfive.co/efficiency-hub/cloud-services/aws-elasticache) - [AWS DynamoDB 7](https://www.pointfive.co/efficiency-hub/cloud-services/aws-dynamodb) - [AWS Bedrock 6](https://www.pointfive.co/efficiency-hub/cloud-services/aws-bedrock) --- Source: the public page above. Product screenshots and illustrative interfaces are examples, not live customer data.