{"action":"created","comment":{"url":"https://api.github.com/repos/ClusterHQ/flocker/pulls/comments/40187451","id":40187451,"diff_hunk":"@@ -430,6 +435,55 @@ def test_convergence_sent_state_fail_resends(self):\n             )\n         )\n \n+    def test_convergence_sent_state_fail_resends_alternating(self):\n+        \"\"\"\n+        If sending state to the control node fails the next iteration will send\n+        state even if the state is the same as the last acknowledge state.\n+        \"\"\"\n+        local_state = NodeState(\n+            hostname=u'192.0.2.123',\n+            used_ports=pset(), applications=pset(),\n+        )\n+        changed_local_state = local_state.set(\n+            used_ports=pset([80]),\n+        )\n+        configuration = Deployment(nodes=[to_node(local_state)])\n+        state = DeploymentState(nodes=[local_state])\n+        changed_state = DeploymentState(nodes=[changed_local_state])\n+        deployer = ControllableDeployer(\n+            local_state.hostname,\n+            [succeed(local_state), succeed(changed_local_state),\n+             succeed(local_state)],","path":"flocker/node/test/test_loop.py","position":82,"original_position":82,"commit_id":"42b292dbb097d7d653e9d3151356dbe4bccb7c66","original_commit_id":"42b292dbb097d7d653e9d3151356dbe4bccb7c66","user":{"login":"wallrj","id":978965,"avatar_url":"https://avatars.githubusercontent.com/u/978965?v=3","gravatar_id":"","url":"https://api.github.com/users/wallrj","html_url":"https://github.com/wallrj","followers_url":"https://api.github.com/users/wallrj/followers","following_url":"https://api.github.com/users/wallrj/following{/other_user}","gists_url":"https://api.github.com/users/wallrj/gists{/gist_id}","starred_url":"https://api.github.com/users/wallrj/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/wallrj/subscriptions","organizations_url":"https://api.github.com/users/wallrj/orgs","repos_url":"https://api.github.com/users/wallrj/repos","events_url":"https://api.github.com/users/wallrj/events{/privacy}","received_events_url":"https://api.github.com/users/wallrj/received_events","type":"User","site_admin":false},"body":":question: Why do we have `changed_state`. Shouldn't we be priming the `ControllableDeployer` with identical states for this test? Does it matter that the un-acknowledged state was different?","created_at":"2015-09-23T10:04:24Z","updated_at":"2015-09-23T10:04:24Z","html_url":"https://github.com/ClusterHQ/flocker/pull/1970#discussion_r40187451","pull_request_url":"https://api.github.com/repos/ClusterHQ/flocker/pulls/1970","_links":{"self":{"href":"https://api.github.com/repos/ClusterHQ/flocker/pulls/comments/40187451"},"html":{"href":"https://github.com/ClusterHQ/flocker/pull/1970#discussion_r40187451"},"pull_request":{"href":"https://api.github.com/repos/ClusterHQ/flocker/pulls/1970"}}},"pull_request":{"url":"https://api.github.com/repos/ClusterHQ/flocker/pulls/1970","id":45746169,"html_url":"https://github.com/ClusterHQ/flocker/pull/1970","diff_url":"https://github.com/ClusterHQ/flocker/pull/1970.diff","patch_url":"https://github.com/ClusterHQ/flocker/pull/1970.patch","issue_url":"https://api.github.com/repos/ClusterHQ/flocker/issues/1970","number":1970,"state":"open","locked":false,"title":"[FLOC-3090] Implement back-pressure on agents sending updates.","user":{"login":"tomprince","id":283816,"avatar_url":"https://avatars.githubusercontent.com/u/283816?v=3","gravatar_id":"","url":"https://api.github.com/users/tomprince","html_url":"https://github.com/tomprince","followers_url":"https://api.github.com/users/tomprince/followers","following_url":"https://api.github.com/users/tomprince/following{/other_user}","gists_url":"https://api.github.com/users/tomprince/gists{/gist_id}","starred_url":"https://api.github.com/users/tomprince/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tomprince/subscriptions","organizations_url":"https://api.github.com/users/tomprince/orgs","repos_url":"https://api.github.com/users/tomprince/repos","events_url":"https://api.github.com/users/tomprince/events{/privacy}","received_events_url":"https://api.github.com/users/tomprince/received_events","type":"User","site_admin":false},"body":"https://clusterhq.atlassian.net/browse/FLOC-3090\r\n\r\nThis is the expedient solution. One issue with it, is that it delays convergence iterations after this one until after the control node acknowledges the state update.\n\n<!-- Reviewable:start -->\n[<img src=\"https://reviewable.io/review_button.png\" height=40 alt=\"Review on Reviewable\"/>](https://reviewable.io/reviews/clusterhq/flocker/1970)\n<!-- Reviewable:end 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