payload: {"action":"created","comment":{"url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/comments/277886085","pull_request_review_id":229814343,"id":277886085,"node_id":"MDI0OlB1bGxSZXF1ZXN0UmV2aWV3Q29tbWVudDI3Nzg4NjA4NQ==","diff_hunk":"@@ -1573,13 +1604,30 @@ func (c *Cloud) GetCandidateZonesForDynamicVolume() (sets.String, error) {\n \t// TODO: Caching / expose v1.Nodes to the cloud provider?\n \t// TODO: We could also query for subnets, I think\n \n-\tfilters := []*ec2.Filter{newEc2Filter(\"instance-state-name\", \"running\")}\n+\t// Note: It is more efficient to call the EC2 API twice with different tag\n+\t// filters than to call it once with a tag filter that results in a logical\n+\t// OR. For really large clusters the logical OR will result in EC2 API rate\n+\t// limiting.\n+\tinstances := []*ec2.Instance{}\n \n-\tinstances, err := c.describeInstances(filters)\n+\tbaseFilters := []*ec2.Filter{newEc2Filter(\"instance-state-name\", \"running\")}\n+\n+\tfilters := c.tagging.addFilters(baseFilters)\n+\tdi, err := c.describeInstances(filters)","path":"pkg/cloudprovider/providers/aws/aws.go","position":82,"original_position":82,"commit_id":"4f380d1b163a6384fef5fd383f1b4989d771c220","original_commit_id":"6cc791d6f3ba544b6a3e4b0a078c3e4659ab98c2","user":{"login":"zhan849","id":3003026,"node_id":"MDQ6VXNlcjMwMDMwMjY=","avatar_url":"https://avatars2.githubusercontent.com/u/3003026?v=4","gravatar_id":"","url":"https://api.github.com/users/zhan849","html_url":"https://github.com/zhan849","followers_url":"https://api.github.com/users/zhan849/followers","following_url":"https://api.github.com/users/zhan849/following{/other_user}","gists_url":"https://api.github.com/users/zhan849/gists{/gist_id}","starred_url":"https://api.github.com/users/zhan849/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/zhan849/subscriptions","organizations_url":"https://api.github.com/users/zhan849/orgs","repos_url":"https://api.github.com/users/zhan849/repos","events_url":"https://api.github.com/users/zhan849/events{/privacy}","received_events_url":"https://api.github.com/users/zhan849/received_events","type":"User","site_admin":false},"body":"Thanks @mcrute \r\n\r\nI double checked the code, since this function is only used in volume creation, and it is just looking for a set of zones that has running instances from the cluster, would using kube client (`aws.Cloud` already has this) to fetch such information be enough? This will not need to make cloud provider call at all. We can start with List from api server directly and look for optimization by listing from cache.\r\n\r\nIt is true that there could be a race between node die and and the node actually disappear from api server, but under such condition, there will be more high level reconciliation triggered so we are good.\r\n\r\nwanna see what other people thinks about it\r\n\r\n","created_at":"2019-04-23T21:49:01Z","updated_at":"2019-04-23T21:49:01Z","html_url":"https://github.com/kubernetes/kubernetes/pull/76749#discussion_r277886085","pull_request_url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/76749","author_association":"NONE","_links":{"self":{"href":"https://api.github.com/repos/kubernetes/kubernetes/pulls/comments/277886085"},"html":{"href":"https://github.com/kubernetes/kubernetes/pull/76749#discussion_r277886085"},"pull_request":{"href":"https://api.github.com/repos/kubernetes/kubernetes/pulls/76749"}},"in_reply_to_id":277775097},"pull_request":{"url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/76749","id":271548935,"node_id":"MDExOlB1bGxSZXF1ZXN0MjcxNTQ4OTM1","html_url":"https://github.com/kubernetes/kubernetes/pull/76749","diff_url":"https://github.com/kubernetes/kubernetes/pull/76749.diff","patch_url":"https://github.com/kubernetes/kubernetes/pull/76749.patch","issue_url":"https://api.github.com/repos/kubernetes/kubernetes/issues/76749","number":76749,"state":"open","locked":false,"title":"Avoid using tag filters for EC2 API where possible","user":{"login":"mcrute","id":108204,"node_id":"MDQ6VXNlcjEwODIwNA==","avatar_url":"https://avatars1.githubusercontent.com/u/108204?v=4","gravatar_id":"","url":"https://api.github.com/users/mcrute","html_url":"https://github.com/mcrute","followers_url":"https://api.github.com/users/mcrute/followers","following_url":"https://api.github.com/users/mcrute/following{/other_user}","gists_url":"https://api.github.com/users/mcrute/gists{/gist_id}","starred_url":"https://api.github.com/users/mcrute/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mcrute/subscriptions","organizations_url":"https://api.github.com/users/mcrute/orgs","repos_url":"https://api.github.com/users/mcrute/repos","events_url":"https://api.github.com/users/mcrute/events{/privacy}","received_events_url":"https://api.github.com/users/mcrute/received_events","type":"User","site_admin":false},"body":"**What type of PR is this?**\r\n/kind bug\r\n\r\n**What this PR does / why we need it**:\r\nFor very large clusters these tag filters are not efficient within the EC2 API and will result in rate limiting. Most of these queries have filters that are targeted narrowly enough that the elimination of the tags filter will not return significantly more data but will be executed more efficiently by the EC2 API and reduce the chance of throttling.\r\n\r\nAdditionally, some API wrappers did not support pagination despite the underlying API calls being paginated. This change adds pagination to prevent accidentally truncating the returned results.\r\n\r\nThis change, once approved, will also need back-ported to 1.13 and 1.14.\r\n\r\n**Which issue(s) this PR fixes**:\r\nFixes #76747\r\n\r\n**Does this PR introduce a user-facing change?**:\r\n```release-note\r\nLimit use of tags when calling EC2 API to prevent API throttling for very large clusters\r\n```\r\n\r\n/sig aws\r\n/sig cloud-provider\r\n/priority critical-urgent\r\n/assign @mcrute @justinsb 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