{"action":"created","issue":{"url":"https://api.github.com/repos/RobotLocomotion/drake/issues/9561","repository_url":"https://api.github.com/repos/RobotLocomotion/drake","labels_url":"https://api.github.com/repos/RobotLocomotion/drake/issues/9561/labels{/name}","comments_url":"https://api.github.com/repos/RobotLocomotion/drake/issues/9561/comments","events_url":"https://api.github.com/repos/RobotLocomotion/drake/issues/9561/events","html_url":"https://github.com/RobotLocomotion/drake/pull/9561","id":365494588,"node_id":"MDExOlB1bGxSZXF1ZXN0MjE5NDAxNDY3","number":9561,"title":"Revert \"Add caching to MultibodyTree\"","user":{"login":"rpoyner-tri","id":17582368,"node_id":"MDQ6VXNlcjE3NTgyMzY4","avatar_url":"https://avatars0.githubusercontent.com/u/17582368?v=4","gravatar_id":"","url":"https://api.github.com/users/rpoyner-tri","html_url":"https://github.com/rpoyner-tri","followers_url":"https://api.github.com/users/rpoyner-tri/followers","following_url":"https://api.github.com/users/rpoyner-tri/following{/other_user}","gists_url":"https://api.github.com/users/rpoyner-tri/gists{/gist_id}","starred_url":"https://api.github.com/users/rpoyner-tri/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rpoyner-tri/subscriptions","organizations_url":"https://api.github.com/users/rpoyner-tri/orgs","repos_url":"https://api.github.com/users/rpoyner-tri/repos","events_url":"https://api.github.com/users/rpoyner-tri/events{/privacy}","received_events_url":"https://api.github.com/users/rpoyner-tri/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":{"login":"sherm1","id":4088016,"node_id":"MDQ6VXNlcjQwODgwMTY=","avatar_url":"https://avatars1.githubusercontent.com/u/4088016?v=4","gravatar_id":"","url":"https://api.github.com/users/sherm1","html_url":"https://github.com/sherm1","followers_url":"https://api.github.com/users/sherm1/followers","following_url":"https://api.github.com/users/sherm1/following{/other_user}","gists_url":"https://api.github.com/users/sherm1/gists{/gist_id}","starred_url":"https://api.github.com/users/sherm1/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sherm1/subscriptions","organizations_url":"https://api.github.com/users/sherm1/orgs","repos_url":"https://api.github.com/users/sherm1/repos","events_url":"https://api.github.com/users/sherm1/events{/privacy}","received_events_url":"https://api.github.com/users/sherm1/received_events","type":"User","site_admin":false},"assignees":[{"login":"sherm1","id":4088016,"node_id":"MDQ6VXNlcjQwODgwMTY=","avatar_url":"https://avatars1.githubusercontent.com/u/4088016?v=4","gravatar_id":"","url":"https://api.github.com/users/sherm1","html_url":"https://github.com/sherm1","followers_url":"https://api.github.com/users/sherm1/followers","following_url":"https://api.github.com/users/sherm1/following{/other_user}","gists_url":"https://api.github.com/users/sherm1/gists{/gist_id}","starred_url":"https://api.github.com/users/sherm1/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sherm1/subscriptions","organizations_url":"https://api.github.com/users/sherm1/orgs","repos_url":"https://api.github.com/users/sherm1/repos","events_url":"https://api.github.com/users/sherm1/events{/privacy}","received_events_url":"https://api.github.com/users/sherm1/received_events","type":"User","site_admin":false}],"milestone":null,"comments":3,"created_at":"2018-10-01T14:42:07Z","updated_at":"2018-10-01T15:12:38Z","closed_at":"2018-10-01T15:12:38Z","author_association":"CONTRIBUTOR","pull_request":{"url":"https://api.github.com/repos/RobotLocomotion/drake/pulls/9561","html_url":"https://github.com/RobotLocomotion/drake/pull/9561","diff_url":"https://github.com/RobotLocomotion/drake/pull/9561.diff","patch_url":"https://github.com/RobotLocomotion/drake/pull/9561.patch"},"body":"Reverts RobotLocomotion/drake#9489\r\nDear @sherm1,\r\n\r\nThe on-call build cop, @rpoyner-tri , believes that your PR #9489 may have\r\nbroken one or more of Drake's continuous integration builds [1,2]. It is\r\npossible to break a build even if your PR passed continuous integration\r\npre-merge because additional platforms and tests are built post-merge.\r\n\r\nThe specific build failures under investigation are:\r\nhttps://drake-jenkins.csail.mit.edu/view/Nightly%20Production/job/linux-xenial-clang-bazel-nightly-memcheck-ubsan/\r\nhttps://drake-jenkins.csail.mit.edu/view/Nightly%20Production/job/linux-xenial-clang-bazel-nightly-memcheck-ubsan-everything/\r\n\r\nTherefore, the build cop has created this revert PR and started a complete\r\npost-merge build to determine whether your PR was in fact the cause of the\r\nproblem. If that build passes, this revert PR will be merged 60 minutes from\r\nnow. You can then fix the problem at your leisure, and send a new PR to\r\nreinstate your change.\r\n\r\nIf you believe your original PR did not actually break the build, please\r\nexplain on this thread.\r\n\r\nIf you believe you can fix the break promptly in lieu of a revert, please\r\nexplain on this thread, and send a PR to the build cop for review ASAP.\r\n\r\nIf you believe your original PR definitely did break the build and should be\r\nreverted, please review and LGTM this PR. This allows the build cop to merge\r\nwithout waiting for CI results.\r\n\r\nFor advice on how to handle a build cop revert, see [3].\r\n\r\nThanks!\r\nYour Friendly Oncall Buildcop\r\n\r\n[1] CI Continuous Production Dashboard: https://drake-jenkins.csail.mit.edu/view/Continuous%20Production/\r\n[2] CI Nightly Production Dashboard: https://drake-jenkins.csail.mit.edu/view/Nightly%20Production/\r\n[3] https://drake.mit.edu/buildcop.html#workflow-for-handling-a-build-cop-revert\n\n<!-- Reviewable:start -->\n---\nThis change is [<img src=\"https://reviewable.io/review_button.svg\" height=\"34\" align=\"absmiddle\" alt=\"Reviewable\"/>](https://reviewable.io/reviews/robotlocomotion/drake/9561)\n<!-- Reviewable:end -->\n"},"comment":{"url":"https://api.github.com/repos/RobotLocomotion/drake/issues/comments/425944570","html_url":"https://github.com/RobotLocomotion/drake/pull/9561#issuecomment-425944570","issue_url":"https://api.github.com/repos/RobotLocomotion/drake/issues/9561","id":425944570,"node_id":"MDEyOklzc3VlQ29tbWVudDQyNTk0NDU3MA==","user":{"login":"rpoyner-tri","id":17582368,"node_id":"MDQ6VXNlcjE3NTgyMzY4","avatar_url":"https://avatars0.githubusercontent.com/u/17582368?v=4","gravatar_id":"","url":"https://api.github.com/users/rpoyner-tri","html_url":"https://github.com/rpoyner-tri","followers_url":"https://api.github.com/users/rpoyner-tri/followers","following_url":"https://api.github.com/users/rpoyner-tri/following{/other_user}","gists_url":"https://api.github.com/users/rpoyner-tri/gists{/gist_id}","starred_url":"https://api.github.com/users/rpoyner-tri/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rpoyner-tri/subscriptions","organizations_url":"https://api.github.com/users/rpoyner-tri/orgs","repos_url":"https://api.github.com/users/rpoyner-tri/repos","events_url":"https://api.github.com/users/rpoyner-tri/events{/privacy}","received_events_url":"https://api.github.com/users/rpoyner-tri/received_events","type":"User","site_admin":false},"created_at":"2018-10-01T15:12:38Z","updated_at":"2018-10-01T15:12:38Z","author_association":"CONTRIBUTOR","body":"Fix-forward of a nightly breakage works for me."}}
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