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I'm really just curious, why does ECS Hotswap set the minimumHealthyPercent to 0 as opposed to 100, which is default for the service, or 50, as seems to be the default in CDK Section of Hotswap which sets minimumHealthyPercent to 0 is linked below: |
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I am not sure if this is a good default value but I believe if you run an ecs service with just single task with maximumHealthyPercent=100 and you need force the task update, you probably have to set the minimumHealthyPercent to 0 otherwise the only task might not be replaced unless maximumHealthyPercent is set to 200. However, with maximumHealthyPercent=200 the new deployment will have to bring up an additional healthy task before it can terminate the original one. If the additional one is not in healthy state min>0 max>100 might not be able to replace the only task. With min=0, the only task will be immediately tore down and replaced. As cdk hot swap is designed for development only I believe setting min=0 makes sense here. |
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That makes sense, especially if it is documented somewhere as well (even just a comment in the code); if only to prevent confusion of "Why did all my tasks just die" |
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Yes that would be great to add some description in the document. Let's create a PR for that and link that PR to this discussion. |
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Hello! Reopening this discussion to make it searchable. |
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I am not sure if this is a good default value but I believe if you run an ecs service with just single task with maximumHealthyPercent=100 and you need force the task update, you probably have to set the minimumHealthyPercent to 0 otherwise the only task might not be replaced unless maximumHealthyPercent is set to 200. However, with maximumHealthyPercent=200 the new deployment will have to bring up an additional healthy task before it can terminate the original one. If the additional one is not in healthy state min>0 max>100 might not be able to replace the only task. With min=0, the only task will be immediately tore down and replaced.
As cdk hot swap is designed for development only I b…