Memcached 1.6.18 Release: Fixes and Updates to Proxy Mode, Extstore, and Meta Protocol

Memcached 1.6.18 is now available, focusing on a large number of fixes and updates to the proxy mode, extstore disk flushing, meta‑protocol changes, and various smaller bug fixes.

Fixes

Core: no longer stop threads on SIGINT/SIGTERM.

Core: remove printf from signal handlers.

Proxy: iterative modified request handling.

Proxy: record time relative to response lifecycle.

Proxy: fix crash during SIGHUP reload while waiting.

Proxy: fix backend connection lifecycle.

Proxy: IO thread performance improvement.

Proxy: add mcp.AWAIT_BACKGROUND .

Proxy: fix Lua registry corruption on data‑block error.

Proxy: add proxy_await_active statistics.

Proxy: fix partial response read handling.

Proxy: fix partial write during refresh.

Proxy: add more backend failure messages.

Proxy: fix crash when mcp.log_req receives a nil response.

Core: fix token listener when length < 8.

Proxy: add debug symbols to Lua build.

Core: give each thread a unique name.

Proxy: fix crash when backend is garbage‑collected.

Remove libevent license from the distribution.

Fixes for builds using clang‑15.

Meta: remove meta_response_old startup option.

Meta: allow mg without flags and reflect OK on EN.

Meta: meta arithmetic command had extra space.

Meta: remove extra spaces from meta response.

Proxy: fix error initializing backend connection.

Fix log timestamp handling.

Fix clang error function prototype.

Proxy: add mcp.await FASTGOOD flag.