{"action":"created","comment":{"url":"https://api.github.com/repos/elastic/elasticsearch/pulls/comments/33654852","id":33654852,"diff_hunk":"@@ -118,6 +118,32 @@ public static ShardPath loadShardPath(ESLogger logger, NodeEnvironment env, Shar\n         }\n     }\n \n+    /**\n+     * This method tries to archive left-over shards where the index name has been reused but the UUID is different into\n+     * an <tt>archive_${shard.id}_${index.uuid}</tt> directory to allow the new shard to be allocated.\n+     */\n+    public static void archiveShardDirectory(ESLogger logger, NodeEnvironment env, ShardId shardId, @IndexSettings Settings indexSettings) throws IOException {\n+        final String indexUUID = indexSettings.get(IndexMetaData.SETTING_UUID, IndexMetaData.INDEX_UUID_NA_VALUE);\n+        final Path[] paths = env.availableShardPaths(shardId);\n+        for (Path path : paths) {\n+            ShardStateMetaData load = ShardStateMetaData.FORMAT.loadLatestState(logger, path);\n+            if (load != null) {\n+                if ((load.indexUUID.equals(indexUUID) || IndexMetaData.INDEX_UUID_NA_VALUE.equals(load.indexUUID)) == false) {\n+                    logger.warn(\"{} found shard on path: [{}] with a different index UUID - this shard seems to be leftover from a different index with the same name.\", shardId, path);\n+                    assert Files.isDirectory(path) : path + \" is not a directory\";\n+                    final Path target = path.resolveSibling(\"archived_\" + path.getFileName().toString() + \"_\" + load.indexUUID);\n+                    try {\n+                        Files.move(path, target); // rename directory\n+                    } catch (IOException ex) {\n+                        logger.warn(\"{} failed to archive shard from an index with a different UUID into {}\", ex, shardId, target);\n+                        throw ex;\n+                    }\n+                    logger.warn(\"{} archived shard from an index with a different UUID into {}, Remove the leftover shard if it's not needed anymore\", shardId, target);","path":"core/src/main/java/org/elasticsearch/index/shard/ShardPath.java","position":24,"original_position":24,"commit_id":"f2676a871e3cdefbcfbea551f28d5f643c989e56","original_commit_id":"f2676a871e3cdefbcfbea551f28d5f643c989e56","user":{"login":"clintongormley","id":56599,"avatar_url":"https://avatars.githubusercontent.com/u/56599?v=3","gravatar_id":"","url":"https://api.github.com/users/clintongormley","html_url":"https://github.com/clintongormley","followers_url":"https://api.github.com/users/clintongormley/followers","following_url":"https://api.github.com/users/clintongormley/following{/other_user}","gists_url":"https://api.github.com/users/clintongormley/gists{/gist_id}","starred_url":"https://api.github.com/users/clintongormley/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/clintongormley/subscriptions","organizations_url":"https://api.github.com/users/clintongormley/orgs","repos_url":"https://api.github.com/users/clintongormley/repos","events_url":"https://api.github.com/users/clintongormley/events{/privacy}","received_events_url":"https://api.github.com/users/clintongormley/received_events","type":"User","site_admin":false},"body":"Possibly \"Delete the leftover shard manually...\"?","created_at":"2015-07-01T07:36:48Z","updated_at":"2015-07-01T07:36:48Z","html_url":"https://github.com/elastic/elasticsearch/pull/11945#discussion_r33654852","pull_request_url":"https://api.github.com/repos/elastic/elasticsearch/pulls/11945","_links":{"self":{"href":"https://api.github.com/repos/elastic/elasticsearch/pulls/comments/33654852"},"html":{"href":"https://github.com/elastic/elasticsearch/pull/11945#discussion_r33654852"},"pull_request":{"href":"https://api.github.com/repos/elastic/elasticsearch/pulls/11945"}}},"pull_request":{"url":"https://api.github.com/repos/elastic/elasticsearch/pulls/11945","id":38880278,"html_url":"https://github.com/elastic/elasticsearch/pull/11945","diff_url":"https://github.com/elastic/elasticsearch/pull/11945.diff","patch_url":"https://github.com/elastic/elasticsearch/pull/11945.patch","issue_url":"https://api.github.com/repos/elastic/elasticsearch/issues/11945","number":11945,"state":"open","locked":false,"title":"Allow shards to be allocated if leftover shard from different index exists.","user":{"login":"s1monw","id":973334,"avatar_url":"https://avatars.githubusercontent.com/u/973334?v=3","gravatar_id":"","url":"https://api.github.com/users/s1monw","html_url":"https://github.com/s1monw","followers_url":"https://api.github.com/users/s1monw/followers","following_url":"https://api.github.com/users/s1monw/following{/other_user}","gists_url":"https://api.github.com/users/s1monw/gists{/gist_id}","starred_url":"https://api.github.com/users/s1monw/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/s1monw/subscriptions","organizations_url":"https://api.github.com/users/s1monw/orgs","repos_url":"https://api.github.com/users/s1monw/repos","events_url":"https://api.github.com/users/s1monw/events{/privacy}","received_events_url":"https://api.github.com/users/s1monw/received_events","type":"User","site_admin":false},"body":"If an index name is reused but a leftover shard still exists on any node\r\nwe fail repeatedly to allocate the shard since we now check the index UUID\r\nbefore reusing data. This commit allows to recover even if there is such a\r\nleftover shard by trying to archive the shard into a seperate directory.\r\n\r\nCloses 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