Today, we’re announcing the general availability of provisioned mode for AWS Lambda with Amazon Simple Queue Service (Amazon SQS) Event Source Mapping (ESM), a new feature that customers can use to optimize the throughput of their event-driven applications by configuring dedicated polling resources. Using this new capability, which provides 3x faster scaling, and 16x higher concurrency, you can process events with lower latency, handle sudden traffic spikes more effectively, and maintain precise control over your event processing resources.

Modern applications increasingly rely on event-driven architectures where services communicate through events and messages. Amazon SQS is commonly used as an event source for Lambda functions, so developers can build loosely coupled, scalable applications. Although the SQS ESM automatically handles queue polling and function invocation, customers with stringent performance requirements have asked for more control over the polling behavior to handle spiky traffic patterns and maintain low processing latency.

Provisioned mode for SQS ESM addresses these needs by introducing event pollers, which are dedicated resources that remain ready to handle expected traffic patterns. These event pollers can auto scale up to 1000 per concurrent executions per minute, more than three times faster than before to handle sudden spikes in event traffic and provide up to 20,000 concurrency–16 times higher capacity to process millions of events with Lambda functions. This enhanced scaling behavior helps customers maintain predictable low latency even during traffic surges.

Enterprises across various industries, from financial services to gaming companies, are using AWS Lambda with Amazon SQS to process real-time events for their mission-critical applications. These organizations, which include some of the largest online gaming platforms and financial institutions, require consistent subsecond processing times for their event-driven workloads, particularly during periods of peak usage. Provisioned mode for SQS ESM is a capability you can use to meet your stringent performance requirements while maintaining cost controls.

Enhanced control and performance

With provisioned mode, you can configure both minimum and maximum numbers of event pollers for your SQS ESM. Each event poller represents a unit of compute that handles queue polling, event batching, and filtering before invoking Lambda functions. Each event poller can handle up to 1 MB/sec of throughput, up to 10 concurrent invokes, or up to 10 SQS polling API calls per second. By setting a minimum number of event pollers, you enable your application to maintain a baseline processing capacity that can immediately handle sudden traffic increases. We recommend that you set the minimum event pollers required to handle your known peak workload requirements. The optional maximum setting helps prevent overloading downstream systems by limiting the total processing throughput.

The new mode delivers significant improvements in how your event-driven applications handle varying workloads. When traffic increases, your ESM detects the growing backlog within seconds and dynamically scales event pollers between your configured minimum and maximum values three times faster than before. This enhanced scaling capability is complemented by a substantial increase in processing capacity, with support for up to 2 GBps of aggregate traffic, and up to 20K concurrent requests—16x higher than previously possible. By maintaining a minimum number of ready-to-use event pollers, your application achieves predictable performance, handling sudden traffic spikes without the delay typically associated with scaling up resources. During low traffic periods, your ESM automatically scales down to your configured minimum number of event pollers, which means you can optimize costs while maintaining responsiveness.

Let’s try it out

Enabling provisioned mode is straightforward in the AWS Management Console. You need to already have an SQS queue configured and a Lambda function. To get started, in the Configuration tab for your Lambda function, choose Triggers, then Add trigger. This will bring up a user interface where you can configure your trigger. Choose SQS from the dropdown menu for source and then select the SQS queue you want to use.

Under Event poller configuration, you will now see a new option called Provisioned mode. Select Configure to reveal settings for Minimum event pollers and Maximum event pollers, each with defaults and minimum and maximum values displayed.

After you have configured Provisioned mode, you can save your trigger. If you need to make changes later, you can find the current configuration under the Triggers tab in the AWS Lambda configuration section, and you can modify your current settings there.

Monitoring and observability

You can monitor your provisioned mode usage through Amazon CloudWatch metrics. The ProvisionedPollers metric shows the number of active event pollers processing events in one-minute windows.

Now available

Provisioned mode for Lambda SQS ESM is available today in all commercial AWS Regions. You can start using this feature through the AWS Management Console, AWS Command Line Interface (AWS CLI), or AWS SDKs. Pricing is based on the number of event pollers provisioned and the duration they’re provisioned for, measured in Event Poller Units (EPUs). Each EPU supports up to 1 MB per second throughput capacity per event poller, with minimum 2 event pollers per ESM. See the AWS pricing page for more information on EPU charges.

To learn more about provisioned mode for SQS ESM, visit the AWS Lambda documentation. Start building more responsive event-driven applications today with enhanced control over your event processing resources.