dormando edited this page May 18, 2016 · 1 revision

Memcached 1.4.21 Release Notes

Date: 2014-10-12


Download Link:



  • makefile cleanups
  • Avoid OOM errors when locked items stuck in tail

If clients occasionally fetch many items, more than can fit the TCP buffers, then hang for a very long period of time, that slab class could OOM. In older versions this could cause a crash. Since 1.4.20 this will cause OOM errors.

Now, if a locked item lands in the LRU tail, it will be bumped back to the head and an lrutail_reflocked counter incremented. If you're concerned about having stuck clients, watch that counter.

Big thanks to Jay Grizzard et all at Box for helping track this down!

New Features



The following people contributed to this release since 1.4.20.

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 1.4.20..1.4.21 or use a web view.

     4  Steve Wills
     3  dormando
     1  Jay Grizzard