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Plack::Middleware::Restart: Zero‑downtime migration on Starman vs. Cherokee The goal is to upgrade a small PSGI web application without dropping any active connections. Plack::Middleware::Restart achieves this by spawning a child process, keeping the listening socket open, and swapping parent and child. However, the middleware’s behavior depends on the under
Integration boundary A PSGI/Plack application runs behind Starman, Twiggy, or Corona — each implements graceful shutdown differently (SIGQUIT, SIGTERM with timeout, Coro semantics). None drains WebSocket or long-poll connections by default. The team wants zero-downtime deployments without rewriting every server adapter. Constraints and uncertainty Adding a s
Graceful Process Migration in Perl When migrating or updating a small Perl application deployed via a PSGI interface, the goal is to replace the running process without dropping active connections. While pre-forking servers like Starman support signal-based management, the interaction between the master process and worker children during a reload can introdu
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