dormando edited this page Jul 8, 2018 · 1 revision

Memcached 1.5.9 Release Notes

Date: 2018-7-7



Bugfix release.

Important note: if using --enable-seccomp, privilege dropping is no longer on by default. The feature is experimental and many users are reporting hard to diagnose problems on varied platforms.

Seccomp is now marked EXPERIMENTAL, and must be explicitly enabled by adding -o drop_privileges. Once we're more confident with the usability of the feature, it will be enabled in -o modern, like any other new change. You should only use it if you are willing to carefully test it, especially if you're a vendor or distribution.

Also important is a crash fix in extstore when using the ASCII protocol, large items, and running low on memory.

Thanks to the many people who've participated in this release :) Lots of commits from the community this time around!


  • fix ASCII get error handling (+ extstore leak)
  • drop_privileges is no longer default if available.
  • remove bad assert from crawler
  • Mark seccomp experimental
  • Include keys with non-[\w.~-] bytes in memcached-tool dump
  • whitelist clock_gettime in seccomp rules
  • Fix segfault: Prevent calling sasl_server_step before sasl_server_start
  • fix flaky lru-maintainer test (OS X)

New Features

  • support transparent hugepages on Linux (-L option)


The following people contributed to this release since 1.5.8.

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 1.5.8..1.5.9 or use a web view.

     5	dormando
     3	Paul Furtado
     2	Linkerist
     2	Peter (Stig) Edwards
     2	Vadim Pushtaev
     1	Charmander
     1	Chen-Yu Tsai
     1	Sjon Hortensius
     1	Stanisław Pitucha

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