twitter
fatcache
C2013–2015
twitter / fatcache · Archived
fatcache
Memcache on SSD
5Distinct people
5Mentions
0Explicit recommenders
1.3KGitHub stars
What to know before exploring
What it is
Memcache on SSD
GitHub
Where it is used
No documented product use has been verified yet.
What people are saying
No recommendation phrase was found in the indexed comments.
No classified warning is attached to this page. Read the discussions before treating silence as approval.
Also in these discussions
No other repository is repeatedly linked in the same discussions.
This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 12:54:37 PM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by month5 dated mentions
Observed mentions: 2013-02-11 19:57:03 UTC to 2015-07-20 16:03:13 UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| Feb 2013 | 2013-02-01 00:00:00 UTC | 2013-03-01 00:00:00 UTC | 2 | 1 | 1 |
| Mar 2013 | 2013-03-01 00:00:00 UTC | 2013-04-01 00:00:00 UTC | 1 | 0 | 1 |
| Apr 2013 | 2013-04-01 00:00:00 UTC | 2013-05-01 00:00:00 UTC | 0 | 0 | 0 |
| May 2013 | 2013-05-01 00:00:00 UTC | 2013-06-01 00:00:00 UTC | 0 | 0 | 0 |
| Jun 2013 | 2013-06-01 00:00:00 UTC | 2013-07-01 00:00:00 UTC | 0 | 0 | 0 |
| Jul 2013 | 2013-07-01 00:00:00 UTC | 2013-08-01 00:00:00 UTC | 0 | 0 | 0 |
| Aug 2013 | 2013-08-01 00:00:00 UTC | 2013-09-01 00:00:00 UTC | 0 | 0 | 0 |
| Sep 2013 | 2013-09-01 00:00:00 UTC | 2013-10-01 00:00:00 UTC | 0 | 0 | 0 |
| Oct 2013 | 2013-10-01 00:00:00 UTC | 2013-11-01 00:00:00 UTC | 1 | 0 | 1 |
| Nov 2013 | 2013-11-01 00:00:00 UTC | 2013-12-01 00:00:00 UTC | 0 | 0 | 0 |
| Dec 2013 | 2013-12-01 00:00:00 UTC | 2014-01-01 00:00:00 UTC | 0 | 0 | 0 |
| Jan 2014 | 2014-01-01 00:00:00 UTC | 2014-02-01 00:00:00 UTC | 0 | 0 | 0 |
| Feb 2014 | 2014-02-01 00:00:00 UTC | 2014-03-01 00:00:00 UTC | 0 | 0 | 0 |
| Mar 2014 | 2014-03-01 00:00:00 UTC | 2014-04-01 00:00:00 UTC | 0 | 0 | 0 |
| Apr 2014 | 2014-04-01 00:00:00 UTC | 2014-05-01 00:00:00 UTC | 0 | 0 | 0 |
| May 2014 | 2014-05-01 00:00:00 UTC | 2014-06-01 00:00:00 UTC | 0 | 0 | 0 |
| Jun 2014 | 2014-06-01 00:00:00 UTC | 2014-07-01 00:00:00 UTC | 0 | 0 | 0 |
| Jul 2014 | 2014-07-01 00:00:00 UTC | 2014-08-01 00:00:00 UTC | 0 | 0 | 0 |
| Aug 2014 | 2014-08-01 00:00:00 UTC | 2014-09-01 00:00:00 UTC | 0 | 0 | 0 |
| Sep 2014 | 2014-09-01 00:00:00 UTC | 2014-10-01 00:00:00 UTC | 0 | 0 | 0 |
| Oct 2014 | 2014-10-01 00:00:00 UTC | 2014-11-01 00:00:00 UTC | 0 | 0 | 0 |
| Nov 2014 | 2014-11-01 00:00:00 UTC | 2014-12-01 00:00:00 UTC | 0 | 0 | 0 |
| Dec 2014 | 2014-12-01 00:00:00 UTC | 2015-01-01 00:00:00 UTC | 0 | 0 | 0 |
| Jan 2015 | 2015-01-01 00:00:00 UTC | 2015-02-01 00:00:00 UTC | 0 | 0 | 0 |
| Feb 2015 | 2015-02-01 00:00:00 UTC | 2015-03-01 00:00:00 UTC | 0 | 0 | 0 |
| Mar 2015 | 2015-03-01 00:00:00 UTC | 2015-04-01 00:00:00 UTC | 0 | 0 | 0 |
| Apr 2015 | 2015-04-01 00:00:00 UTC | 2015-05-01 00:00:00 UTC | 0 | 0 | 0 |
| May 2015 | 2015-05-01 00:00:00 UTC | 2015-06-01 00:00:00 UTC | 0 | 0 | 0 |
| Jun 2015 | 2015-06-01 00:00:00 UTC | 2015-07-01 00:00:00 UTC | 0 | 0 | 0 |
| Jul 2015 | 2015-07-01 00:00:00 UTC | 2015-08-01 00:00:00 UTC | 1 | 0 | 1 |
What Hacker News says
5 sourcesFLfleitz·Jul 20, 2015
Exactly: https://github.com/twitter/fatcache
A single fatcache can do close to 100K set/sec for 100 bytes item sizes.
A single fatcache can do close to 4.5K get/sec for 100 byte item sizes.
All the 8 fatcache instances in aggregate do 32K get/sec to a single 600 GB SSD.
In How we store 400M phone numbers with fast lookupHow about the usual reason? Because it can't be pulled into non-GPL projects.
This is actually relevant, at least, to me. I've been porting Twitter's fatcache[1] to iOS, and wouldn't be if it was GPL'd. I haven't even looked at Facebook's code, due to the GPL license, which makes it—literally—unusable to me on iOS and Android.
[1] https://github.com/twitter/fatcache
In FlashCache at Facebook from 2010 to 2013 and beyondTwitter open-sourced an implementation of this concept recently: https://github.com/twitter/fatcache https://news.ycombinator.com/item?id=5202868
I hope Facebook ends up open sourcing McDipper in the future.
In McDipper: A key-value cache for Flash storageThey use MAP_ANONYMOUS, not a file-backed mmap.
https://github.com/twitter/fatcache/blob/master/src/fc_util....
In fatcache - Memcache on SSD