feat: add application-level keepalive to prevent ALB idle connection timeouts#49
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feat: add application-level keepalive to prevent ALB idle connection timeouts#49
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Pull request overview
Adds an application-level keepalive mechanism to the Python TaskHubGrpcWorker to prevent idle gRPC connections from being dropped by L7 load balancers (e.g., AWS ALB) by periodically invoking the existing Hello RPC.
Changes:
- Introduces a new
keepalive_intervalconstructor parameter and stores it on the worker. - Adds an async background
_keepalive_loopthat periodically callsstub.Hello(...)via an executor thread. - Schedules and cancels the keepalive task alongside the work-item stream lifecycle.
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…timeouts AWS ALBs do not forward HTTP/2 PING frames, causing idle gRPC connections to be closed. This adds a background loop that periodically calls the existing Hello RPC as application-level traffic to keep the connection alive through L7 load balancers. Signed-off-by: joshvanl <me@joshvanl.dev>
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CasperGN
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Mar 11, 2026
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AWS ALBs do not forward HTTP/2 PING frames, causing idle gRPC connections to be closed. This adds a background loop that periodically calls the existing Hello RPC as application-level traffic to keep the connection alive through L7 load balancers.