JAjapaget·Nov 10, 2015Submission
21 points · Open discussionben-manes
caffeine
Java2015–2025
ben-manes / caffeine
caffeine
A high performance caching library for Java
19Distinct people
51Mentions
1Explicit recommenders
17.9KGitHub stars
What to know before exploring
What it is
A high performance caching library for Java
GitHub
Where it is used
No documented product use was verified in the last source check.
What people are saying
This is sometimes referred to as the "admission policy" of a cache and can have a large effect at increasing the hit ratio. Most policies try to minimize the impact of low…
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Also in these discussions
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This week on Hacker News
Nov 8–Nov 15 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/15/2026, 6:01:32 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 year51 dated mentions
Observed mentions: 2015-02-24 07:16:52 UTC to 2025-03-06 01:57:40 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 |
|---|---|---|---|---|---|
| 2015 | 2015-01-01 00:00:00 UTC | 2016-01-01 00:00:00 UTC | 7 | 3 | 4 |
| 2016 | 2016-01-01 00:00:00 UTC | 2017-01-01 00:00:00 UTC | 5 | 1 | 4 |
| 2017 | 2017-01-01 00:00:00 UTC | 2018-01-01 00:00:00 UTC | 2 | 0 | 2 |
| 2018 | 2018-01-01 00:00:00 UTC | 2019-01-01 00:00:00 UTC | 3 | 0 | 3 |
| 2019 | 2019-01-01 00:00:00 UTC | 2020-01-01 00:00:00 UTC | 8 | 0 | 8 |
| 2020 | 2020-01-01 00:00:00 UTC | 2021-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2021 | 2021-01-01 00:00:00 UTC | 2022-01-01 00:00:00 UTC | 7 | 0 | 7 |
| 2022 | 2022-01-01 00:00:00 UTC | 2023-01-01 00:00:00 UTC | 2 | 0 | 2 |
| 2023 | 2023-01-01 00:00:00 UTC | 2024-01-01 00:00:00 UTC | 7 | 0 | 7 |
| 2024 | 2024-01-01 00:00:00 UTC | 2025-01-01 00:00:00 UTC | 3 | 0 | 3 |
| 2025 | 2025-01-01 00:00:00 UTC | 2026-01-01 00:00:00 UTC | 6 | 0 | 6 |
What Hacker News says
7 sourcesI recently did an analysis of caching algorithms and the difference can be quite large. Approaches that only use the current working set are very similar, but those that take advantage of historic data can make more intelligent choices.
https://github.com/ben-manes/caffeine/wiki/Efficiency
In File system replacement algorithms (2006)The locks are becoming more fine-grained in memcached [1], so that should be less of a problem now.
It is possible to remove lock contention on the read path [2] if a concurrent hash table is used. This can be done while using an O(1) eviction policy that outperforms LRU [3].
[1] https://github.com/memcached/memcached/pull/97
[2] https://github.com/ben-manes/caffeine/wiki/Design
[3] https://github.com/ben-manes/caffeine/wiki/Efficiency
In Clarifications about Redis and MemcachedA high performance caching library for Java 8
2 points · Open discussion* Benchmarks:
https://github.com/ben-manes/caffeine/wiki/Benchmarks
* Design:
https://github.com/ben-manes/caffeine/wiki/Design
This is an evolution of two previously successful caching libraries:
* ConcurrentLinkedHashMap:
https://code.google.com/p/concurrentlinkedhashmap/
* Google Guava's Cache:
https://github.com/google/guava
In Caffeine – Java 8 cachingElimination can be enhanced by using a combination strategy, such as DECS [1]. Using a combiner approach should also work on a queue structure, though interestingly enough there is a paper on elimination-based fifo queues. I wrote an elimination stack in Java [2], but I haven't gotten around to adding combining to the arena yet. The performance is pretty good compared to other shared concurrent structures.
[1] http://www.cs.bgu.ac.il/~hendlerd/papers/DECS.pdf
[2] https://github.com/ben-manes/caffeine
In Lock-Free Data Structures. The Evolution of a Stack