Sporadic 404 errors

[pkaramol]

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Overview of the Issue

Occasionally, the creation of new PRs fails with the following error

{"level":"error","ts":"2021-09-17T19:31:20.643Z","caller":"events/pull_updater.go:14","msg":"GET https://github.com/gitapi/repos/pkaramol/atlantis-poc-v2/pulls/9/files?per_page=300: 404 Not Found []","json":{"repo":"pkaramol/atlantis-poc-v2","pull":"9"},"stacktrace":"github.com/runatlantis/atlantis/server/events.(*PullUpdater).updatePull\n\t/go/src/github.com/runatlantis/atlantis/server/events/pull_updater.go:14\ngithub.com/runatlantis/atlantis/server/events.(*PlanCommandRunner).runAutoplan\n\t/go/src/github.com/runatlantis/atlantis/server/events/plan_command_runner.go:77\ngithub.com/runatlantis/atlantis/server/events.(*PlanCommandRunner).Run\n\t/go/src/github.com/runatlantis/atlantis/server/events/plan_command_runner.go:221\ngithub.com/runatlantis/atlantis/server/events.(*DefaultCommandRunner).RunAutoplanCommand\n\t/go/src/github.com/runatlantis/atlantis/server/events/command_runner.go:162"}

The PR is there of course and atlantis does have access to the repo (created other PRs with success)

Reproduction Steps

Logs

Environment details

Additional Context

The problem may go away by restarting atlantis

[dgteixeira]

Hello,
We are facing a similar issue, but it's when we have autoplan enabled, we sometimes (it appears to be RNG) get the following error, through an Atlantis comment:
"
Plan Error

GET https://github.com/gitapi/repos/<org_name>/<repo_name>/pulls/33/files?per_page=300: 404 Not Found []

"
It looks like that the atlantis tries to get the files faster than github actually processes the PR.
When retrying atlantis plan after a while. it works without issue.

[calexandre]

I also have this issue, and I believe that this may have something to do with GitHub API eventual consistency or caching - either on GitHub's side or on Atlantis's side.

Imho what is happening is that the webhook is being sent immediately after the PR gets created, but when Atlantis queries the API for that PR, the API returns 404 because its cache has not been invalidated yet.

If my theory confirms, this can be 'easily' fixed by adding a small delay (5 seconds for example) before querying the API for the given PR.

[AntonUspishnyi]

Duplicates #1905

[jamengual]

is this still an issue with v0.19.8?