Release: Elastic Load Balancing on 2009-05-18

Release Notes>Release: Elastic Load Balancing on 2009 05 18
Introducing Elastic Load Balancing. This is an initial public beta release of Elastic Load Balancing.


Submitted By: Ranjeet@AWS
Release Date: May 18, 2009 12:00 AM GMT
Latest Version: 2009-05-15
Created On: May 18, 2009 12:10 AM GMT
Last Updated: May 18, 2009 3:40 AM GMT

New Features

This is the initial public beta release of Elastic Load Balancing. Please see the Elastic Load Balancing page at for details.

Known Issues

Issue Description Impact
1 Elastic Load Balancing is a feature of Amazon Elastic Compute Cloud (EC2). You must be signed up for Amazon Elastic Compute Cloud (EC2) service in order to call the Elastic Load Balancing APIs.
2 The Amazon CloudWatch Latency metric for a LoadBalancer aggregates the latency for all requests to all LoadBalancer ports (Listeners ) into a single metric. If you have a LoadBalancer that is handling traffic on multiple ports, you cannot view the Latency of the requests on a per-port basis. Moreover, for LoadBalancers with TCP listeners, the Latency metric is not a meaningful measure of the TCP request latency.
3 When an Availability Zone is removed from the LoadBalancer, instances in that Availability Zone may continue to take traffic after they are described as OutOfService by DescribeInstanceHealth. Instances may continue to take traffic for a short period after the Availability Zone is removed from the LoadBalancer.
4 A LoadBalancer might not fail traffic away from an Availability Zone if all the instances in a given Availability Zone fail health checks. In the event that all your instances in an Availability Zone fail, traffic will still be routed to the failed Availability zone and those requests will fail.
5 When instances are registered with a LoadBalancer, they are assumed to be healthy. Regardless of the actual health of an instance, the LoadBalancer will assume a newly registered instance is healthy and put it into the InService state. If the instance is unhealthy, it will be transitioned to the OutOfService state on the first health check.
6 You cannot charge customers for their use of Elastic Load Balancing for instances running an Amazon EC2 paid AMI. At this time, you cannot use Elastic Load Balancing with instances running Amazon EC2 paid AMIs.
7 SOAP requests over HTTP will result in the following error: Premature end of file. AWSRequestId:No request id received. API requests using SOAP are only supported over HTTPS.
8 The LoadBalancer does not report zeros for the RequestCount metric in Amazon CloudWatch when there are no requests. You will get no datapoints for the RequestCount metric for the period when there are no requests. You cannot set Auto Scaling triggers that rely on zero RequestCount.
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