{"action":"created","comment":{"url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/comments/220776639","pull_request_review_id":159263246,"id":220776639,"node_id":"MDI0OlB1bGxSZXF1ZXN0UmV2aWV3Q29tbWVudDIyMDc3NjYzOQ==","diff_hunk":"@@ -312,6 +330,12 @@ func (p *PriorityQueue) Pop() (*v1.Pod, error) {\n \tp.lock.Lock()\n \tdefer p.lock.Unlock()\n \tfor len(p.activeQ.data.queue) == 0 {\n+\t\t// When the queue is empty, invocation of Pop() is blocked until new item is enqueued.\n+\t\t// When Close() is called, the p.closed is set and the condition is broadcast,\n+\t\t// which causes this loop to continue and return from the Pop().\n+\t\tif p.closed {\n+\t\t\treturn nil, fmt.Errorf(queueClosed)\n+\t\t}\n \t\tp.cond.Wait()\n \t}\n \tobj, err := p.activeQ.Pop()","path":"pkg/scheduler/core/scheduling_queue.go","position":81,"original_position":65,"commit_id":"e69be328510ca81ac706bee4d684abbd4a432ad4","original_commit_id":"474b75c185313ffeb110f420e26cbb394b6f5d7f","user":{"login":"Huang-Wei","id":1425903,"node_id":"MDQ6VXNlcjE0MjU5MDM=","avatar_url":"https://avatars0.githubusercontent.com/u/1425903?v=4","gravatar_id":"","url":"https://api.github.com/users/Huang-Wei","html_url":"https://github.com/Huang-Wei","followers_url":"https://api.github.com/users/Huang-Wei/followers","following_url":"https://api.github.com/users/Huang-Wei/following{/other_user}","gists_url":"https://api.github.com/users/Huang-Wei/gists{/gist_id}","starred_url":"https://api.github.com/users/Huang-Wei/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Huang-Wei/subscriptions","organizations_url":"https://api.github.com/users/Huang-Wei/orgs","repos_url":"https://api.github.com/users/Huang-Wei/repos","events_url":"https://api.github.com/users/Huang-Wei/events{/privacy}","received_events_url":"https://api.github.com/users/Huang-Wei/received_events","type":"User","site_admin":false},"body":"This is a good point.\r\n\r\nI read some article saying that when `cond.Wait()` is called, the goroutine is suspended, but it's smart to not hold the lock. Instead, it tries to re-acquire the lock when it's awaken by a `Broadcast()` or `Signal()`.\r\n\r\nThe article is [here](https://kaviraj.me/understanding-condition-variable-in-go/), and it states like this:\r\n\r\n> It may look like that the goroutine waiting(rec.cond.Wait()) is holding the lock whole time(rec.Lock()), but its not, Internally cond.Wait() unlocks it and it **locks it again** only when it wakes up by other go routine.\r\n\r\nSo if this's true, when it's awaken again, it should try to acquire the lock first, and then check if its length is 0, then it's safe.\r\n\r\nBut I need to write some sample to verify above saying.\r\n","created_at":"2018-09-27T02:19:52Z","updated_at":"2018-09-27T02:19:52Z","html_url":"https://github.com/kubernetes/kubernetes/pull/68700#discussion_r220776639","pull_request_url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/68700","author_association":"MEMBER","_links":{"self":{"href":"https://api.github.com/repos/kubernetes/kubernetes/pulls/comments/220776639"},"html":{"href":"https://github.com/kubernetes/kubernetes/pull/68700#discussion_r220776639"},"pull_request":{"href":"https://api.github.com/repos/kubernetes/kubernetes/pulls/68700"}},"in_reply_to_id":220407268},"pull_request":{"url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/68700","id":215737153,"node_id":"MDExOlB1bGxSZXF1ZXN0MjE1NzM3MTUz","html_url":"https://github.com/kubernetes/kubernetes/pull/68700","diff_url":"https://github.com/kubernetes/kubernetes/pull/68700.diff","patch_url":"https://github.com/kubernetes/kubernetes/pull/68700.patch","issue_url":"https://api.github.com/repos/kubernetes/kubernetes/issues/68700","number":68700,"state":"open","locked":false,"title":"shutdown schedulingQueue gracefully","user":{"login":"Huang-Wei","id":1425903,"node_id":"MDQ6VXNlcjE0MjU5MDM=","avatar_url":"https://avatars0.githubusercontent.com/u/1425903?v=4","gravatar_id":"","url":"https://api.github.com/users/Huang-Wei","html_url":"https://github.com/Huang-Wei","followers_url":"https://api.github.com/users/Huang-Wei/followers","following_url":"https://api.github.com/users/Huang-Wei/following{/other_user}","gists_url":"https://api.github.com/users/Huang-Wei/gists{/gist_id}","starred_url":"https://api.github.com/users/Huang-Wei/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Huang-Wei/subscriptions","organizations_url":"https://api.github.com/users/Huang-Wei/orgs","repos_url":"https://api.github.com/users/Huang-Wei/repos","events_url":"https://api.github.com/users/Huang-Wei/events{/privacy}","received_events_url":"https://api.github.com/users/Huang-Wei/received_events","type":"User","site_admin":false},"body":"**What this PR does / why we need it**:\r\n\r\nWhen schedulingQueue is empty, scheduler is blocked to wait for new items (through `cond.Wait()`). At this time if stopCh() is closed(), actually the main scheduling goroutine has no chance to gracefully exit - it's still hanging there at step `cond.Wait()`.\r\n\r\nIt's not actually a bug, but it's good to add a fix to let scheduling goroutine exit gracefully in this case.\r\n\r\n**Which issue(s) this PR fixes**:\r\nFixes #68453\r\n\r\n**Special notes for your reviewer**:\r\n\r\n- I'm only aware of FIFO and PriorityQueue implements schedulingQueue. If there are others, please let me know\r\n- External scheduler implementation might be impacted  as a new `Close()` method is introduced in interface `SchedulingQueue`.\r\n\r\n**Release note**:\r\n```release-note\r\nNONE\r\n```\r\n\r\n/kind cleanup\r\n/sig scheduling\r\n/assign @k82cn 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