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Move delay for Heroku Preboot to before marking deployment successful (#21736)

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* Move delay for Heroku Preboot from post-deploy to pre-success

* Shorten arbitrary delay before first Fastly purge
This commit is contained in:
James M. Greene
2021-09-24 19:35:13 -05:00
committed by GitHub
parent 433b3afd53
commit a76f30e5f2
3 changed files with 22 additions and 25 deletions
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17
script/deployment/purge-edge-cache.js
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@@ -2,7 +2,6 @@ import sleep from 'await-sleep'
import got from 'got'
const ONE_SECOND = 1000
const ONE_MINUTE = 60 * ONE_SECOND
async function purgeFastlyBySurrogateKey({ apiToken, serviceId, surrogateKey }) {
const key = surrogateKey
@@ -17,17 +16,10 @@ async function purgeFastlyBySurrogateKey({ apiToken, serviceId, surrogateKey })
return got.post(requestPath, { headers, json: true })
}
// This delay (includeDelayForPreboot) can potentially be removed in the
// future if the deployment workflow is updated to include a delay to offset
// Heroku Preboot before this script runs.
export default async function purgeEdgeCache({ includeDelayForPreboot = true } = {}) {
// If Heroku Preboot is enabled, then there is an additional delay of at
// least 2 minutes before the new dynos are swapped into active serving.
const delayForPrebootSwap = 2 * ONE_MINUTE + 30 * ONE_SECOND
export default async function purgeEdgeCache() {
// Give the app some extra time to wake up before the thundering herd of
// Fastly requests.
const delayBeforeFirstPurge = ONE_MINUTE
const delayBeforeFirstPurge = 30 * ONE_SECOND
// Evidence has shown that it's necessary to purge twice to ensure all
// customers see fresh content.
@@ -47,11 +39,6 @@ export default async function purgeEdgeCache({ includeDelayForPreboot = true } =
surrogateKey: FASTLY_SURROGATE_KEY,
}
if (includeDelayForPreboot) {
console.log('Waiting for Heroku Preboot to swap dynos...')
await sleep(delayForPrebootSwap)
}
console.log('Waiting extra time to prevent a Thundering Herd problem...')
await sleep(delayBeforeFirstPurge)