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dormando edited this page May 6, 2024 · 1 revision

Memcached 1.6.27 Release Notes

Date: 2024-5-5

Download

http://www.memcached.org/files/memcached-1.6.27.tar.gz

Overview

Many proxy updates, including a critical stability fix for users of the newer style request API.

Adds new meta protocol extensions:

  • Ecas: If specified and request succeeds, uses supplied number for the CAS value of the item. This allows using external versioning for cache data (ie; row versions, crc's, etc).

  • x flag for md: This flag causes md to atomically replace the value with the same meta data, but 0 byte value. Can be combined with I to make an empty item that is marked stale.

Fixes

  • proxy: fix backend depth counter going negative
  • proxy: fix short writes caused by mcp.internal
  • proxy: fix IO backlog softlock
  • proxy: even more lua GC tuning
  • proxy: fix race condition leading to hang
  • proxy: fix possible corruption with global objects
  • extstore: start arg tokenizer fix
  • proxy: fix proxy_config with > 2 lua files

New Features

  • core: add queue info to stats conns
  • proxy: mcp.server_stats(subcmd)
  • meta: md with x removes value
  • proxy: wait timeout API
  • proxy: config thread cron functions
  • meta: E flag for overriding CAS value
  • proxy: stats proxybe to show bad backends
  • proxy: rctx:cfd() and log_req cfd

Contributors

The following people contributed to this release since 1.6.26.

Note that this is based on who contributed changes, not how they were done. In many cases, a code snippet on the mailing list or a bug report ended up as a commit with your name on it.

Note that this is just a summary of how many changes each person made which doesn't necessarily reflect how significant each change was. For details on what led up into a branch, either grab the git repo and look at the output of git log 1.6.26..1.6.27 or use a web view.

    19	dormando
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