intermittent 404 Not Found on /pulls github calls

[jacekn]

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Overview of the Issue

I'm experiencing intermittent 404s on PRs. Atlantis leaves the following comment in the PR:

GET https://github.com/gitapi/repos/myorg/myrepo/pulls/999/files?per_page=300: 404 Not Found []

Reproduction Steps

This happens intermittently but the steps are to:

• open new PR
• atlantis drops the comment with 404

Logs

Logs

{"level":"info","ts":"2021-11-19T11:50:25.342Z","caller":"events/events_controller.go:318","msg":"identified event as type \"opened\"","json":{}}
{"level":"info","ts":"2021-11-19T11:50:25.342Z","caller":"events/events_controller.go:346","msg":"executing autoplan","json":{}}
{"level":"error","ts":"2021-11-19T11:50:25.766Z","caller":"events/pull_updater.go:14","msg":"GET https://github.com/gitapi/repos/myorg/myrepo/pulls/999/files?per_page=300: 404 Not Found []","json":{"repo":"myorg/myrepo","pull":"999"},"stacktrace":"github.com/runatlantis/atlantis/server/events.(*PullUpdater).updatePull\n\t/home/circleci/project/server/events/pull_updater.go:14\ngithub.com/runatlantis/atlantis/server/events.(*PlanCommandRunner).runAutoplan\n\t/home/circleci/project/server/events/plan_command_runner.go:77\ngithub.com/runatlantis/atlantis/server/events.(*PlanCommandRunner).Run\n\t/home/circleci/project/server/events/plan_command_runner.go:221\ngithub.com/runatlantis/atlantis/server/events.(*DefaultCommandRunner).RunAutoplanCommand\n\t/home/circleci/project/server/events/command_runner.go:162"}

Environment details

Atlantis v0.17.5

Atlantis server-side config file:

    repo-allowlist: github.com/myorg/myrepo
    allow-fork-prs: true

    default-tf-version: 0.13.7

    # See https://www.runatlantis.io/docs/checkout-strategy.html#merge
    checkout-strategy: merge

    gh-user: xxx

    data-dir: /atlantis
    atlantis-url: http://yyy

Repo atlantis.yaml file (atlantis is actually disabled for the

version: 3
automerge: true
delete_source_branch_on_merge: true
projects:
- dir: mydir1
  terraform_version: v0.13.7
  autoplan:
    when_modified: ["**", "../modules/**.tf"]
    enabled: true
- dir: mydir2
  autoplan:
    enabled: false

Environment variables:

    - name: ATLANTIS_PORT
      value: "4141"

Additional Context

Similar to

• intermittent 404 Not Found on /pulls github calls #1019
• weird error at PR initialization #1453

[bmbferreira]

I think this might be related with the failure on e2e tests that happened the other day after merging #1884

[kapilt]

it feels like part of the issue might be the lack of exponential backoff in the retry fix https://github.com/runatlantis/atlantis/pull/1131/files

current code
https://github.com/runatlantis/atlantis/blob/master/server/events/vcs/github_client.go#L333

it does look like its doing geometirc backoff now, but its unclear if we need to switch to exponential to resolve.

[jacekn]

Maybe it's worth also adding extra logging to the section to record the fact that retries are happening?

[virgofx]

Confirmed that we are experiencing this issue as well in 0.17.5. Would love for this to get fixed ASAP.

[jamesclair]

This issue is happening in 0.17.4 as well.

[iainlane]

Looks like something similar to #1131 is needed but in GetModifiedFiles

atlantis/server/events/vcs/github_client.go

Lines 123 to 126 in 1b30fe0

	pageFiles, resp, err := g.client.PullRequests.ListFiles(g.ctx, repo.Owner, repo.Name, pull.Num, &opts)
	if err != nil {
	return files, err
	}

[jamengual]

is this still an issue with v0.19.8?

[V1Ct0RHMz]

It's happening with me on v0.20.1

[darkside720]

its happening on 0.22 as well