{"action":"created","comment":{"url":"https://api.github.com/repos/ClusterHQ/flocker/pulls/comments/25779067","id":25779067,"diff_hunk":"@@ -320,6 +327,36 @@ def run(self, deployer):\n \n \n @implementer(IStateChange)\n+class DeleteDataset(PRecord):\n+    \"\"\"\n+    Delete all local copies of the dataset.\n+\n+    A better action would be one that deletes a specific manifestation\n+    (\"volume\" in flocker.volume legacy terminology). Unfortunately\n+    currently \"remotely owned volumes\" (legacy terminology), aka\n+    non-primary manifestations or replicas, are not exposed to the\n+    deployer, so we have to enumerate them here.\n+\n+    :ivar Dataset: The dataset to delete.\n+    \"\"\"\n+    dataset = field(mandatory=True, type=Dataset)\n+\n+    def run(self, deployer):\n+        service = deployer.volume_service\n+        d = service.enumerate()\n+\n+        def got_volumes(volumes):\n+            deletions = []\n+            for volume in volumes:\n+                if volume.name.dataset_id == self.dataset.dataset_id:\n+                    deletions.append(service.pool.destroy(volume).addErrback(\n+                        write_failure, _logger, u\"flocker:p2pdeployer:delete\"))","path":"flocker/node/_deploy.py","position":54,"original_position":54,"commit_id":"10c22739eb9ac6ecc466becc92e55db35c850f54","original_commit_id":"a9c81af2f6c3b542d300aebfb950abf6578bd594","user":{"login":"exarkun","id":254565,"avatar_url":"https://avatars.githubusercontent.com/u/254565?v=3","gravatar_id":"","url":"https://api.github.com/users/exarkun","html_url":"https://github.com/exarkun","followers_url":"https://api.github.com/users/exarkun/followers","following_url":"https://api.github.com/users/exarkun/following{/other_user}","gists_url":"https://api.github.com/users/exarkun/gists{/gist_id}","starred_url":"https://api.github.com/users/exarkun/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/exarkun/subscriptions","organizations_url":"https://api.github.com/users/exarkun/orgs","repos_url":"https://api.github.com/users/exarkun/repos","events_url":"https://api.github.com/users/exarkun/events{/privacy}","received_events_url":"https://api.github.com/users/exarkun/received_events","type":"User","site_admin":false},"body":"I think we really need to document what we log.\r\n\r\nCan we start a reference document that gives an exhaustive list of \"systems\" and what they indicate?  Or should people just refer to the implementation when they want to know what a particular log event 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