EMR Retype Tasks

Opportunity Name:

EMR Retype Task Instances to Spot


AWS Resource Type:

EMR EC2 Instance


Opportunity Description:

CloudFix identifies opportunities to reduce EC2 costs by recommending the use of Spot instances for Task nodes within EMR clusters. This recommendation is based on analyzing the current usage and cost of EC2 instances associated with EMR clusters, identifying those that can be safely converted to Spot instances without impacting the performance or reliability of the workload.


Criteria for identifying the opportunity:

  • Resource exists: The EC2 instance is part of an EMR cluster.
  • Is Task Instance: The instance is identified as a Task node within the EMR cluster.
  • Not Spot: The instance is not already a Spot instance.
  • Estimated savings calculation: The estimated savings are calculated based on the difference between the current price and the Spot price for the instance type, ensuring that the savings are greater than 2% of the annual cost.
  • Annual cost, extrapolated from the last 31 days of usage, exceeds the annual public cost threshold (default $100).


Potential savings (range in % on annual basis):

The potential savings vary based on the difference between the on-demand and Spot prices for the specific instance types being used. Customers can expect to see significant savings, especially for workloads with flexible start and end times or those that can tolerate interruptions.


Can CloudFix apply an automatic fix?



Other considerations:

  • Performance impact: Using Spot instances for Task nodes in EMR clusters should not impact the performance of most workloads, as Task nodes are typically used for parallelizable workloads that can tolerate interruptions.
  • Data loss considerations: There is minimal risk of data loss, as Task nodes do not store persistent data. However, ongoing tasks may be interrupted if the Spot instance is reclaimed by AWS.
  • Security concerns: There are no additional security concerns when using Spot instances compared to on-demand instances. AWS provides the same level of security and network isolation for Spot instances.


Additional Resources:



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