{"action":"created","comment":{"url":"https://api.github.com/repos/kubernetes/community/pulls/comments/223138343","pull_request_review_id":162203326,"id":223138343,"node_id":"MDI0OlB1bGxSZXF1ZXN0UmV2aWV3Q29tbWVudDIyMzEzODM0Mw==","diff_hunk":"@@ -0,0 +1,277 @@\n+---\n+kep-number: 25\n+title: Migrating API objects to latest storage version\n+authors:\n+  - \"@xuchao\"\n+owning-sig: sig-api-machinery\n+reviewers:\n+  - \"@deads2k\"\n+  - \"@lavalamp\"\n+approvers:\n+  - \"@deads2k\"\n+  - \"@lavalamp\"\n+creation-date: 2018-08-06\n+last-updated: 2018-09-25\n+status: provisional\n+---\n+\n+# Migrating API objects to latest storage version\n+\n+## Table of Contents\n+\n+   * [Migrating API objects to latest storage version](#migrating-api-objects-to-latest-storage-version)\n+      * [Table of Contents](#table-of-contents)\n+      * [Summary](#summary)\n+      * [Motivation](#motivation)\n+         * [Goals](#goals)\n+      * [Proposal](#proposal)\n+         * [Alpha workflow](#alpha-workflow)\n+         * [Alpha API](#alpha-api)\n+         * [Failure recovery](#failure-recovery)\n+         * [Beta workflow - Automation](#beta-workflow---automation)\n+         * [Risks and Mitigations](#risks-and-mitigations)\n+      * [Graduation Criteria](#graduation-criteria)\n+      * [Alternatives](#alternatives)\n+         * [update-storage-objects.sh](#update-storage-objectssh)\n+\n+## Summary\n+\n+We propose a solution to migrate the stored API objects in Kubernetes clusters.\n+In 2018 Q4, we will deliver a tool of alpha quality. The tool extends and\n+improves based on the [oc adm migrate storage][] command.  We will integrate the\n+storage migration into the Kubernetes upgrade process in 2019 Q1.  We will make\n+the migration automatically triggered in 2019.\n+\n+[oc adm migrate storage]:https://www.mankier.com/1/oc-adm-migrate-storage\n+\n+## Motivation\n+\n+\"Today it is possible to create API objects (e.g., HPAs) in one version of\n+Kubernetes, go through multiple upgrade cycles without touching those objects,\n+and eventually arrive at a version of Kubernetes that can’t interpret the stored\n+resource and crashes. See k8s.io/pr/52185.\"[1][]. We propose a solution to the\n+problem.\n+\n+[1]:https://docs.google.com/document/d/1eoS1K40HLMl4zUyw5pnC05dEF3mzFLp5TPEEt4PFvsM\n+\n+### Goals\n+\n+A successful storage version migration tool must:\n+* work for Kubernetes built-in APIs, custom resources (CR), and aggregated APIs.\n+* do not add burden to cluster administrators or Kubernetes distributions.\n+* only cause insignificant load to apiservers. For example, if the master has\n+  10GB memory, the migration tool should generate less than 10 qps of single\n+  object operations(TODO: measure the memory consumption of PUT operations;\n+  study how well the default 10 Mbps bandwidth limit in the oc command work).\n+* work for big clusters that have ~10^6 instances of some resource types.\n+* make progress in flaky environment, e.g., flaky apiservers, or the migration\n+  process get preempted.\n+* allow system administrators to track the migration progress.\n+\n+As to the deliverables,\n+* in the short term, providing system administrators with a tool to migrate\n+  the Kubernetes built-in API objects to the proper storage versions.\n+* in the long term, automating the migration of Kubernetes built-in APIs, CR,\n+  aggregated APIs without further burdening system administrators or Kubernetes\n+  distributions.\n+\n+## Proposal\n+\n+### Alpha workflow","path":"keps/sig-api-machinery/storage-migration.md","position":80,"original_position":80,"commit_id":"31896aea233d7791586c6c755c8731fefdc1428b","original_commit_id":"31896aea233d7791586c6c755c8731fefdc1428b","user":{"login":"caesarxuchao","id":2823529,"node_id":"MDQ6VXNlcjI4MjM1Mjk=","avatar_url":"https://avatars2.githubusercontent.com/u/2823529?v=4","gravatar_id":"","url":"https://api.github.com/users/caesarxuchao","html_url":"https://github.com/caesarxuchao","followers_url":"https://api.github.com/users/caesarxuchao/followers","following_url":"https://api.github.com/users/caesarxuchao/following{/other_user}","gists_url":"https://api.github.com/users/caesarxuchao/gists{/gist_id}","starred_url":"https://api.github.com/users/caesarxuchao/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/caesarxuchao/subscriptions","organizations_url":"https://api.github.com/users/caesarxuchao/orgs","repos_url":"https://api.github.com/users/caesarxuchao/repos","events_url":"https://api.github.com/users/caesarxuchao/events{/privacy}","received_events_url":"https://api.github.com/users/caesarxuchao/received_events","type":"User","site_admin":false},"body":"Added in the workflow section.","created_at":"2018-10-05T21:04:05Z","updated_at":"2018-10-05T21:04:05Z","html_url":"https://github.com/kubernetes/community/pull/2524#discussion_r223138343","pull_request_url":"https://api.github.com/repos/kubernetes/community/pulls/2524","author_association":"MEMBER","_links":{"self":{"href":"https://api.github.com/repos/kubernetes/community/pulls/comments/223138343"},"html":{"href":"https://github.com/kubernetes/community/pull/2524#discussion_r223138343"},"pull_request":{"href":"https://api.github.com/repos/kubernetes/community/pulls/2524"}},"in_reply_to_id":222861012},"pull_request":{"url":"https://api.github.com/repos/kubernetes/community/pulls/2524","id":208042263,"node_id":"MDExOlB1bGxSZXF1ZXN0MjA4MDQyMjYz","html_url":"https://github.com/kubernetes/community/pull/2524","diff_url":"https://github.com/kubernetes/community/pull/2524.diff","patch_url":"https://github.com/kubernetes/community/pull/2524.patch","issue_url":"https://api.github.com/repos/kubernetes/community/issues/2524","number":2524,"state":"open","locked":false,"title":"[KEP] storage api version migration","user":{"login":"caesarxuchao","id":2823529,"node_id":"MDQ6VXNlcjI4MjM1Mjk=","avatar_url":"https://avatars2.githubusercontent.com/u/2823529?v=4","gravatar_id":"","url":"https://api.github.com/users/caesarxuchao","html_url":"https://github.com/caesarxuchao","followers_url":"https://api.github.com/users/caesarxuchao/followers","following_url":"https://api.github.com/users/caesarxuchao/following{/other_user}","gists_url":"https://api.github.com/users/caesarxuchao/gists{/gist_id}","starred_url":"https://api.github.com/users/caesarxuchao/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/caesarxuchao/subscriptions","organizations_url":"https://api.github.com/users/caesarxuchao/orgs","repos_url":"https://api.github.com/users/caesarxuchao/repos","events_url":"https://api.github.com/users/caesarxuchao/events{/privacy}","received_events_url":"https://api.github.com/users/caesarxuchao/received_events","type":"User","site_admin":false},"body":"This KEP proposes a tool that migrates the stored data in etcd to the latest storage version. 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