{"action":"created","comment":{"url":"https://api.github.com/repos/elastic/elasticsearch/pulls/comments/58313782","id":58313782,"diff_hunk":"@@ -1032,7 +1063,15 @@ public MetaData build() {\n                 }\n             }\n             aliasAndIndexLookup = Collections.unmodifiableSortedMap(aliasAndIndexLookup);\n-            return new MetaData(clusterUUID, version, transientSettings, persistentSettings, indices.build(), templates.build(), customs.build(), allIndices, allOpenIndices, allClosedIndices, aliasAndIndexLookup);\n+            if (graveyardBuilder != null) {\n+                // if the index graveyard has been modified, add the new version to the custom map\n+                customs.put(IndexGraveyard.TYPE, graveyardBuilder.build());\n+            } else if (customs.get(IndexGraveyard.TYPE) == null) {\n+                // it was never part of the customs map, so add a fresh entry\n+                customs.put(IndexGraveyard.TYPE, IndexGraveyard.builder().build());\n+            }","path":"core/src/main/java/org/elasticsearch/cluster/metadata/MetaData.java","position":94,"original_position":94,"commit_id":"2963ef920263720511de725dcbc0b43a9f4ece71","original_commit_id":"2963ef920263720511de725dcbc0b43a9f4ece71","user":{"login":"abeyad","id":1631297,"avatar_url":"https://avatars.githubusercontent.com/u/1631297?v=3","gravatar_id":"","url":"https://api.github.com/users/abeyad","html_url":"https://github.com/abeyad","followers_url":"https://api.github.com/users/abeyad/followers","following_url":"https://api.github.com/users/abeyad/following{/other_user}","gists_url":"https://api.github.com/users/abeyad/gists{/gist_id}","starred_url":"https://api.github.com/users/abeyad/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/abeyad/subscriptions","organizations_url":"https://api.github.com/users/abeyad/orgs","repos_url":"https://api.github.com/users/abeyad/repos","events_url":"https://api.github.com/users/abeyad/events{/privacy}","received_events_url":"https://api.github.com/users/abeyad/received_events","type":"User","site_admin":false},"body":"This adds complexity here in the `MetaData.Builder`, in order to make it easier to work with `IndexGraveyard` in `MetaDataDeleteIndexService` and the various tests.  I could go either way on this.","created_at":"2016-04-03T17:20:17Z","updated_at":"2016-04-03T17:20:17Z","html_url":"https://github.com/elastic/elasticsearch/pull/17265#discussion_r58313782","pull_request_url":"https://api.github.com/repos/elastic/elasticsearch/pulls/17265","_links":{"self":{"href":"https://api.github.com/repos/elastic/elasticsearch/pulls/comments/58313782"},"html":{"href":"https://github.com/elastic/elasticsearch/pull/17265#discussion_r58313782"},"pull_request":{"href":"https://api.github.com/repos/elastic/elasticsearch/pulls/17265"}}},"pull_request":{"url":"https://api.github.com/repos/elastic/elasticsearch/pulls/17265","id":63827841,"html_url":"https://github.com/elastic/elasticsearch/pull/17265","diff_url":"https://github.com/elastic/elasticsearch/pull/17265.diff","patch_url":"https://github.com/elastic/elasticsearch/pull/17265.patch","issue_url":"https://api.github.com/repos/elastic/elasticsearch/issues/17265","number":17265,"state":"open","locked":false,"title":"Adds tombstones to cluster state for index deletions","user":{"login":"abeyad","id":1631297,"avatar_url":"https://avatars.githubusercontent.com/u/1631297?v=3","gravatar_id":"","url":"https://api.github.com/users/abeyad","html_url":"https://github.com/abeyad","followers_url":"https://api.github.com/users/abeyad/followers","following_url":"https://api.github.com/users/abeyad/following{/other_user}","gists_url":"https://api.github.com/users/abeyad/gists{/gist_id}","starred_url":"https://api.github.com/users/abeyad/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/abeyad/subscriptions","organizations_url":"https://api.github.com/users/abeyad/orgs","repos_url":"https://api.github.com/users/abeyad/repos","events_url":"https://api.github.com/users/abeyad/events{/privacy}","received_events_url":"https://api.github.com/users/abeyad/received_events","type":"User","site_admin":false},"body":"Previously, we would determine index deletes in the cluster state by\r\ncomparing the index metadatas between the current cluster state and the\r\nprevious cluster state and decipher which ones were missing (the missing\r\nones are deleted indices).  This led to a situation where a node that went \r\noffline and rejoined the cluster could potentially cause dangling indices to\r\nbe imported which should have been deleted, because when a node rejoins,\r\nits previous cluster state does not contain reliable state.\r\n\r\nThis commit introduces the notion of index tombstones in the cluster\r\nstate, where we are explicit about which indices have been deleted.\r\nIn the case where the previous cluster state is not useful for index metadata\r\ncomparisons, a node now determines which indices are to be deleted based\r\non these tombstones in the cluster state.  There is also functionality to \r\npurge the tombstones after exceeding a certain amount. \r\n\r\nCloses #16358\r\nCloses #17435 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