Commit Graph

13 Commits

Author SHA1 Message Date
Pierre Souchay 678489d9d1 Added ratelimit to handle throtling cache (#8226)
This implements a solution for #7863

It does:

    Add a new config cache.entry_fetch_rate to limit the number of calls/s for a given cache entry, default value = rate.Inf
    Add cache.entry_fetch_max_burst size of rate limit (default value = 2)

The new configuration now supports the following syntax for instance to allow 1 query every 3s:

    command line HCL: -hcl 'cache = { entry_fetch_rate = 0.333}'
    in JSON

{
  "cache": {
    "entry_fetch_rate": 0.333
  }
}
2020-07-27 21:11:42 +00:00
Daniel Nephin 89f41bddfe Remove TTL from cacheEntryExpiry
This should very slightly reduce the amount of memory required to store each item in
the cache.

It will also enable setting different TTLs based on the type of result. For example
we may want to use a shorter TTL when the result indicates the resource does not exist,
as storing these types of records could easily lead to a DOS caused by
OOM.
2020-04-13 13:10:38 -04:00
Anthony Scalisi beb928f8de fix spelling errors (#7135) 2020-01-27 07:00:33 -06:00
Paul Banks 0638e09b6e
connect: agent leaf cert caching improvements (#5091)
* Add State storage and LastResult argument into Cache so that cache.Types can safely store additional data that is eventually expired.

* New Leaf cache type working and basic tests passing. TODO: more extensive testing for the Root change jitter across blocking requests, test concurrent fetches for different leaves interact nicely with rootsWatcher.

* Add multi-client and delayed rotation tests.

* Typos and cleanup error handling in roots watch

* Add comment about how the FetchResult can be used and change ca leaf state to use a non-pointer state.

* Plumb test override of root CA jitter through TestAgent so that tests are deterministic again!

* Fix failing config test
2019-01-10 12:46:11 +00:00
Paul Banks 88388d760d Support Agent Caching for Service Discovery Results (#4541)
* Add cache types for catalog/services and health/services and basic test that caching works

* Support non-blocking cache types with Cache-Control semantics.

* Update API docs to include caching info for every endpoint.

* Comment updates per PR feedback.

* Add note on caching to the 10,000 foot view on the architecture page to make the new data path more clear.

* Document prepared query staleness quirk and force all background requests to AllowStale so we can spread service discovery load across servers.
2018-10-10 16:55:34 +01:00
Mitchell Hashimoto fc5508f8a3
agent/cache: string through attempt rather than storing on the entry 2018-06-14 09:42:15 -07:00
Mitchell Hashimoto cfcd733609
agent/cache: implement refresh backoff 2018-06-14 09:42:14 -07:00
Mitchell Hashimoto 02b20a0353
agent/cache: address feedback, clarify comments 2018-06-14 09:42:03 -07:00
Mitchell Hashimoto af1d70b026
agent/cache: don't every block on NotifyCh 2018-06-14 09:42:03 -07:00
Mitchell Hashimoto 724b829104
agent/cache: unit tests for ExpiryHeap, found a bug! 2018-06-14 09:42:03 -07:00
Mitchell Hashimoto e0d964188c
agent/cache: make edge case with prev/next idx == 0 handled better 2018-06-14 09:42:03 -07:00
Mitchell Hashimoto 3b550d2b72
agent/cache: rework how expiry data is stored to be more efficient 2018-06-14 09:42:03 -07:00
Mitchell Hashimoto 595193a781
agent/cache: initial TTL work 2018-06-14 09:42:02 -07:00