Chris Lu 92a76fc1a2 fix(filer): limit concurrent proxy reads per volume server (#8608) ...

* fix(filer): limit concurrent proxy reads per volume server

Add a per-volume-server semaphore (default 16) to proxyToVolumeServer
to prevent replication bursts from overwhelming individual volume
servers with hundreds of concurrent connections, which causes them
to drop connections with "unexpected EOF".

Excess requests queue up and respect the client's context, returning
503 if the client disconnects while waiting.

Also log io.CopyBuffer errors that were previously silently discarded.

* Apply suggestion from @gemini-code-assist[bot]

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* fix(filer): use non-blocking release for proxy semaphore

Prevents a goroutine from blocking forever if releaseProxySemaphore
is ever called without a matching acquire.

* test(filer): clean up proxySemaphores entries in all proxy tests

---------

Co-authored-by: Copilot <copilot@github.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

2026-03-11 23:32:09 -07:00

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