{"action":"created","comment":{"url":"https://api.github.com/repos/elastic/elasticsearch/pulls/comments/77539164","id":77539164,"diff_hunk":"@@ -230,33 +238,36 @@ public void messageReceived(Request request, TransportChannel channel) throws Ex\n         }\n     }\n \n-    class PrimaryOperationTransportHandler implements TransportRequestHandler<Request> {\n+    class PrimaryOperationTransportHandler implements TransportRequestHandler<RequestWithAllocationID<Request>> {\n         @Override\n-        public void messageReceived(final Request request, final TransportChannel channel) throws Exception {\n+        public void messageReceived(final RequestWithAllocationID<Request> request, final TransportChannel channel) throws Exception {\n             throw new UnsupportedOperationException(\"the task parameter is required for this operation\");\n         }\n \n         @Override\n-        public void messageReceived(Request request, TransportChannel channel, Task task) {\n-            new AsyncPrimaryAction(request, channel, (ReplicationTask) task).run();\n+        public void messageReceived(RequestWithAllocationID<Request> request, TransportChannel channel, Task task) {\n+            new AsyncPrimaryAction(request.request, request.allocationId, channel, (ReplicationTask) task).run();\n         }\n     }\n \n     class AsyncPrimaryAction extends AbstractRunnable implements ActionListener<PrimaryShardReference> {\n \n         private final Request request;\n+        /** allocationId of the shard this request is meant for */\n+        private final String allocationId;\n         private final TransportChannel channel;\n         private final ReplicationTask replicationTask;\n \n-        AsyncPrimaryAction(Request request, TransportChannel channel, ReplicationTask replicationTask) {\n+        AsyncPrimaryAction(Request request, String allocationId, TransportChannel channel, ReplicationTask replicationTask) {","path":"core/src/main/java/org/elasticsearch/action/support/replication/TransportReplicationAction.java","position":84,"original_position":84,"commit_id":"22e4f844647363d7fe8f7ca6f4a81f66c0eb097a","original_commit_id":"22e4f844647363d7fe8f7ca6f4a81f66c0eb097a","user":{"login":"jasontedor","id":4744941,"avatar_url":"https://avatars.githubusercontent.com/u/4744941?v=3","gravatar_id":"","url":"https://api.github.com/users/jasontedor","html_url":"https://github.com/jasontedor","followers_url":"https://api.github.com/users/jasontedor/followers","following_url":"https://api.github.com/users/jasontedor/following{/other_user}","gists_url":"https://api.github.com/users/jasontedor/gists{/gist_id}","starred_url":"https://api.github.com/users/jasontedor/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jasontedor/subscriptions","organizations_url":"https://api.github.com/users/jasontedor/orgs","repos_url":"https://api.github.com/users/jasontedor/repos","events_url":"https://api.github.com/users/jasontedor/events{/privacy}","received_events_url":"https://api.github.com/users/jasontedor/received_events","type":"User","site_admin":false},"body":"Can we call this constructor parameter `targetAllocationID`?","created_at":"2016-09-05T15:52:57Z","updated_at":"2016-09-05T15:52:57Z","html_url":"https://github.com/elastic/elasticsearch/pull/20320#discussion_r77539164","pull_request_url":"https://api.github.com/repos/elastic/elasticsearch/pulls/20320","_links":{"self":{"href":"https://api.github.com/repos/elastic/elasticsearch/pulls/comments/77539164"},"html":{"href":"https://github.com/elastic/elasticsearch/pull/20320#discussion_r77539164"},"pull_request":{"href":"https://api.github.com/repos/elastic/elasticsearch/pulls/20320"}}},"pull_request":{"url":"https://api.github.com/repos/elastic/elasticsearch/pulls/20320","id":83930966,"html_url":"https://github.com/elastic/elasticsearch/pull/20320","diff_url":"https://github.com/elastic/elasticsearch/pull/20320.diff","patch_url":"https://github.com/elastic/elasticsearch/pull/20320.patch","issue_url":"https://api.github.com/repos/elastic/elasticsearch/issues/20320","number":20320,"state":"open","locked":false,"title":"Verify AllocationIDs in replication actions","user":{"login":"bleskes","id":1006375,"avatar_url":"https://avatars.githubusercontent.com/u/1006375?v=3","gravatar_id":"","url":"https://api.github.com/users/bleskes","html_url":"https://github.com/bleskes","followers_url":"https://api.github.com/users/bleskes/followers","following_url":"https://api.github.com/users/bleskes/following{/other_user}","gists_url":"https://api.github.com/users/bleskes/gists{/gist_id}","starred_url":"https://api.github.com/users/bleskes/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bleskes/subscriptions","organizations_url":"https://api.github.com/users/bleskes/orgs","repos_url":"https://api.github.com/users/bleskes/repos","events_url":"https://api.github.com/users/bleskes/events{/privacy}","received_events_url":"https://api.github.com/users/bleskes/received_events","type":"User","site_admin":false},"body":"Replicated operation consist of a routing action (the original), which is in charge of sending the operation to the primary shard, a primary action which executes the operation on the resolved primary and replica actions which performs the operation on a specific replica. This commit adds the targeted shard's allocation id to the primary and replica actions and makes sure that those match the shard the actions end up executing on.\r\n\r\nThis helps preventing extremely rare failure mode where a shard moves off a node and back to it, all between an action is sent and the time it's processed. \r\n\r\nFor example:\r\n1) Primary action is sent to a relocating primary on node A.\r\n2) The primary finishes relocation to node B and start relocating back.\r\n3) The relocation back gets to the phase and opens up the target engine, on the original node, node A.\r\n4) The primary action is executed on the target engine before the relocation finishes, at which the shard copy on node B is still the official primary - i.e., it is executed on the wrong primary.\r\n\r\n","created_at":"2016-09-04T18:58:05Z","updated_at":"2016-09-05T15:52:57Z","closed_at":null,"merged_at":null,"merge_commit_sha":"2c7dfec85cee1314e4e0d423e9b73d35cf106b78","assignee":null,"assignees":[],"milestone":null,"commits_url":"https://api.github.com/repos/elastic/elasticsearch/pulls/20320/commits","review_comments_url":"https://api.github.com/repos/elastic/elasticsearch/pulls/20320/comments","review_comment_url":"https://api.github.com/repos/elastic/elasticsearch/pulls/comments{/number}","comments_url":"https://api.github.com/repos/elastic/elasticsearch/issues/20320/comments","statuses_url":"https://api.github.com/repos/elastic/elasticsearch/statuses/22e4f844647363d7fe8f7ca6f4a81f66c0eb097a","head":{"label":"bleskes:replication_with_aid","ref":"replication_with_aid","sha":"22e4f844647363d7fe8f7ca6f4a81f66c0eb097a","user":{"login":"bleskes","id":1006375,"avatar_url":"https://avatars.githubusercontent.com/u/1006375?v=3","gravatar_id":"","url":"https://api.github.com/users/bleskes","html_url":"https://github.com/bleskes","followers_url":"https://api.github.com/users/bleskes/followers","following_url":"https://api.github.com/users/bleskes/following{/other_user}","gists_url":"https://api.github.com/users/bleskes/gists{/gist_id}","starred_url":"https://api.github.com/users/bleskes/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bleskes/subscriptions","organizations_url":"https://api.github.com/users/bleskes/orgs","repos_url":"https://api.github.com/users/bleskes/repos","events_url":"https://api.github.com/users/bleskes/events{/privacy}","received_events_url":"https://api.github.com/users/bleskes/received_events","type":"User","site_admin":false},"repo":{"id":9219509,"name":"elasticsearch","full_name":"bleskes/elasticsearch","owner":{"login":"bleskes","id":1006375,"avatar_url":"https://avatars.githubusercontent.com/u/1006375?v=3","gravatar_id":"","url":"https://api.github.com/users/bleskes","html_url":"https://github.com/bleskes","followers_url":"https://api.github.com/users/bleskes/followers","following_url":"https://api.github.com/users/bleskes/following{/other_user}","gists_url":"https://api.github.com/users/bleskes/gists{/gist_id}","starred_url":"https://api.github.com/users/bleskes/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bleskes/subscriptions","organizations_url":"https://api.github.com/users/bleskes/orgs","repos_url":"https://api.github.com/users/bleskes/repos","events_url":"https://api.github.com/users/bleskes/events{/privacy}","received_events_url":"https://api.github.com/users/bleskes/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/bleskes/elasticsearch","description":"Open 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