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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Remove tokio `rt-multi-thread` feature from `lambda_runtime` and `lambda_extension`, and possibly `rt` as well","articleBody":"Currently the `lambda_runtime` crate has an unconditional dependency on tokio withe `rt-multi-thread` feature enabled: \n- https://github.com/awslabs/aws-lambda-rust-runtime/blob/main/lambda-runtime/Cargo.toml#L53\n- https://github.com/awslabs/aws-lambda-rust-runtime/blob/main/lambda-extension/Cargo.toml#L35\n\nI'm struggling to see anywhere this dependency is actually used. Meanwhile, given that lambdas only receive one request at a time, it will frequently make sense for callers to only want to use the current thread runtime anyway (ref: #985 ).\n\nI don't think we even need the `rt` (not multithreaded) feature for `lambda-runtime`, not seeing anywhere we are spawning or interacting with feature gated APIs. Though, for #983  we would need it, so probably ok to leave in?\n\nAnyway, is there a reason we need to depend on the multithreaded runtime feature? Am I missing something?","author":{"url":"https://github.com/jlizen","@type":"Person","name":"jlizen"},"datePublished":"2025-05-06T14:47:33.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/984/aws-lambda-rust-runtime/issues/984"}