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Posted to notifications@apisix.apache.org by GitBox <gi...@apache.org> on 2021/10/29 07:03:55 UTC
[GitHub] [apisix] Marco-Zheng opened a new issue #5365: bug: Lru Cache Problem in traffic-split
Marco-Zheng opened a new issue #5365:
URL: https://github.com/apache/apisix/issues/5365
### Issue description
When i set cache in _M.init() by using timer , it was successfuly, but get nil in _M.access() function, see details as below Steps
### Environment
- apisix version (cmd: `apisix version`): 2.6
### Steps to reproduce
Here is my extension code to timely fetch some data from etcd in traffic-split plugin
```
OIDC_CACHE_TTL
local version_control_lrucache = lru_new(1024 * 4)
local function traffic_info_fetch_per_env(profile_active)
local key = "/version_control/"..profile_active
local res, err = core.etcd.get(key)
if not res or res.status ~= 200 then
--core.log.error("failed to get global rule[", key, "]: ", err)
return
end
local version_control = res.body.node.value
version_control_lrucache:set("version_control:"..profile_active, version_control, OIDC_CACHE_TTL)
core.log.error("push complte")
end
local function traffic_info_fetch()
core.log.error("start traffic info pull")
local profile_actives = {"dev", "uat", "pre", "prod"}
for _, profile_active in ipairs(profile_actives) do
traffic_info_fetch_per_env(profile_active)
end
end
function _M.init()
timers.register_timer("plugin#traffic-split", traffic_info_fetch, true)
end
function _M.destroy()
timers.unregister_timer("plugin#traffic-split", true)
end
```
Then i add below code in _M.acccess() function in order to get the data from cache
```
local version_control = version_control_lrucache:get("version_control:uat")
```
But the weird thing is that my cache settings are successful , when I fetch data from cache, it was nil
My `lua_code_cache` is `open`
### Actual result
cache get is nil
### Error log
No error log
### Expected result
get the cache what i set in
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[GitHub] [apisix] Marco-Zheng commented on issue #5365: bug: Lru Cache Problem in traffic-split
Posted by GitBox <gi...@apache.org>.
Marco-Zheng commented on issue #5365:
URL: https://github.com/apache/apisix/issues/5365#issuecomment-954512912
It seems that the memory is not shared between different processes caused, if apisix has something memory shared cache utils(like lua_shared_dict)
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[GitHub] [apisix] Marco-Zheng commented on issue #5365: bug: Lru Cache Problem in traffic-split
Posted by GitBox <gi...@apache.org>.
Marco-Zheng commented on issue #5365:
URL: https://github.com/apache/apisix/issues/5365#issuecomment-954560770
seems using lua_shared_dict can resolve this problem
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[GitHub] [apisix] tzssangglass closed issue #5365: bug: Lru Cache Problem in traffic-split
Posted by GitBox <gi...@apache.org>.
tzssangglass closed issue #5365:
URL: https://github.com/apache/apisix/issues/5365
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[GitHub] [apisix] tzssangglass commented on issue #5365: bug: Lru Cache Problem in traffic-split
Posted by GitBox <gi...@apache.org>.
tzssangglass commented on issue #5365:
URL: https://github.com/apache/apisix/issues/5365#issuecomment-954611680
I'm turning this issue into a discussion because it's not the code for the project.
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