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dormando edited this page May 12, 2023 · 1 revision

Memcached 1.6.20 Release Notes

Date: 2023-5-12

Download

http://www.memcached.org/files/memcached-1.6.20.tar.gz

Overview

Lots of fixes and updates for Proxy mode. Optimization for extstore disk flushing to alleviate excess evictions. Changes to meta protocol and smaller fixes.

Fixes

  • extstore: increase aggressiveness of flush thread
  • proxy: improve unit test coverage
  • proxy: random small fixes
  • proxy: return 'readvalidate' on be read timeout
  • proxy: don't print null ustats from "stats proxy"
  • proxy: use connect timeout during retries
  • proxy: fix flaky test in proxyconfig.t
  • Add a debian dockerfile, as well as upgrade the autoconf dependency
  • check for sys/auxv.h
  • proxy: send CLIENT_ERROR when proper
  • proxy: print lua error message on reload failure
  • proxy: rip out io_uring code (to be re-added later)
  • proxy: overhaul backend error handling: surface error messages to clients
  • proxy: fix reversal of pipelined backend queries
  • proxy: add request and buffer memory limits
  • proxy: restrict functions for lua config vs route
  • proxy: fix bug ignoring -R setting for proxy reqs
  • proxy: add conntimeout error

New Features

  • proxy: add memory accounting tracking

Total in-flight item buffer memory can be tracked via stats proxy counters. New options added for limiting the number of in-flight requests and amount of buffer memory: mcp.active_req_limit(count) mcp.buffer_memory_limit(kilobytes)

These settings can be adjusted by reloading the configuration.

  • log: Add a new watcher to watch for deletions.

watch deletions stream for logs when items get deleted

  • meta: N flag changes append/prepend.
  • meta: Add ms s flag.

Adds support for the N flag when running metasets in append mode. Normally append/prepend mode does not work if the item doesn't already exist. Now it will autovivify the item with the TTL supplied with the N flag.

Adds support for the s flag in metaset, which will return the size of the new item stored. Useful with append/prepend.

Contributors

The following people contributed to this release since 1.6.19.

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 1.6.19..1.6.20 or use a web view.

    28	dormando
     5	Fei Hu
     1	Fabrice Fontaine
     1	Hemal Shah
     1	Olof Nord
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