hnlq715 commented on a change in pull request #3300:
URL: https://github.com/apache/apisix/pull/3300#discussion_r566543075
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File path: apisix/balancer/ewma.lua
##########
@@ -35,73 +58,69 @@ local function decay_ewma(ewma, last_touched_at, rtt, now)
return ewma
end
-
local function store_stats(upstream, ewma, now)
local success, err, forcible = shm_last_touched_at:set(upstream, now)
if not success then
- core.log.error("balancer_ewma_last_touched_at:set failed ", err)
+ core.log.error("shm_last_touched_at:set failed: ", err)
end
if forcible then
- core.log.warn("balancer_ewma_last_touched_at:set valid items forcibly
overwritten")
+ core.log.warn("shm_last_touched_at:set valid items forcibly
overwritten")
end
success, err, forcible = shm_ewma:set(upstream, ewma)
if not success then
- core.log.error("balancer_ewma:set failed ", err)
+ core.log.error("shm_ewma:set failed: ", err)
end
if forcible then
- core.log.warn("balancer_ewma:set valid items forcibly overwritten")
+ core.log.warn("shm_ewma:set valid items forcibly overwritten")
end
end
-
local function get_or_update_ewma(upstream, rtt, update)
+ local lock_err = nil
+ if update then
+ lock_err = lock(upstream)
+ end
+
local ewma = shm_ewma:get(upstream) or 0
+ if lock_err ~= nil then
Review comment:
~~We need to return ewma value for get and failed update operation.~~
Reconsider this, I think it's ok to move this block, for now we do not use
this ewma in update operation.
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