{"action":"created","comment":{"url":"https://api.github.com/repos/elastic/elasticsearch/pulls/comments/78613243","id":78613243,"diff_hunk":"@@ -0,0 +1,53 @@\n+/*\n+ * Licensed to Elasticsearch under one or more contributor\n+ * license agreements. See the NOTICE file distributed with\n+ * this work for additional information regarding copyright\n+ * ownership. Elasticsearch licenses this file to you under\n+ * the Apache License, Version 2.0 (the \"License\"); you may\n+ * not use this file except in compliance with the License.\n+ * You may obtain a copy of the License at\n+ *\n+ *    http://www.apache.org/licenses/LICENSE-2.0\n+ *\n+ * Unless required by applicable law or agreed to in writing,\n+ * software distributed under the License is distributed on an\n+ * \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY\n+ * KIND, either express or implied.  See the License for the\n+ * specific language governing permissions and limitations\n+ * under the License.\n+ */\n+\n+package org.elasticsearch.discovery.file;\n+\n+import org.apache.logging.log4j.Logger;\n+import org.elasticsearch.common.logging.Loggers;\n+import org.elasticsearch.common.settings.Settings;\n+import org.elasticsearch.discovery.DiscoveryModule;\n+import org.elasticsearch.discovery.zen.ZenDiscovery;\n+import org.elasticsearch.env.Environment;\n+import org.elasticsearch.plugins.DiscoveryPlugin;\n+import org.elasticsearch.plugins.Plugin;\n+\n+/**\n+ * Plugin for providing file-based unicast hosts discovery. The list of unicast hosts\n+ * is obtained by reading the {@link FileBasedUnicastHostsProvider#UNICAST_HOSTS_FILE} in\n+ * the {@link Environment#configFile()} directory.\n+ */\n+public class FileBasedDiscoveryPlugin extends Plugin implements DiscoveryPlugin {\n+\n+    private static final Logger logger = Loggers.getLogger(FileBasedDiscoveryPlugin.class);\n+    private static final String DISCOVERY_FILE = \"file\";\n+\n+    private final Settings settings;\n+\n+    public FileBasedDiscoveryPlugin(Settings settings) {\n+        this.settings = settings;\n+        logger.trace(\"starting file-based discovery plugin...\");\n+    }\n+\n+    public void onModule(DiscoveryModule discoveryModule) {\n+        logger.trace(\"registering file-based unicast hosts provider\");\n+        discoveryModule.addDiscoveryType(DISCOVERY_FILE, ZenDiscovery.class);\n+        discoveryModule.addUnicastHostProvider(DISCOVERY_FILE, FileBasedUnicastHostsProvider.class);","path":"plugins/discovery-file/src/main/java/org/elasticsearch/discovery/file/FileBasedDiscoveryPlugin.java","position":51,"original_position":51,"commit_id":"4828befaf2567106494d8abb41185a4fe33027d1","original_commit_id":"4828befaf2567106494d8abb41185a4fe33027d1","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":"I changed it to use `zen` and just add a unicast host provider to `zen`","created_at":"2016-09-13T18:07:24Z","updated_at":"2016-09-13T18:07:25Z","html_url":"https://github.com/elastic/elasticsearch/pull/20394#discussion_r78613243","pull_request_url":"https://api.github.com/repos/elastic/elasticsearch/pulls/20394","_links":{"self":{"href":"https://api.github.com/repos/elastic/elasticsearch/pulls/comments/78613243"},"html":{"href":"https://github.com/elastic/elasticsearch/pull/20394#discussion_r78613243"},"pull_request":{"href":"https://api.github.com/repos/elastic/elasticsearch/pulls/20394"}}},"pull_request":{"url":"https://api.github.com/repos/elastic/elasticsearch/pulls/20394","id":84555053,"html_url":"https://github.com/elastic/elasticsearch/pull/20394","diff_url":"https://github.com/elastic/elasticsearch/pull/20394.diff","patch_url":"https://github.com/elastic/elasticsearch/pull/20394.patch","issue_url":"https://api.github.com/repos/elastic/elasticsearch/issues/20394","number":20394,"state":"open","locked":false,"title":"File-based discovery plugin","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 PR introduces a new plugin for file-based unicast hosts\r\ndiscovery. This allows specifying the unicast hosts participating\r\nin discovery through a `unicast_hosts.txt` file located in the\r\nconfig directory. The plugin will use the hosts specified in this\r\nfile as the set of hosts to ping during discovery.\r\n\r\nThe format of the `unicast_hosts.txt` file is to have one host/port\r\nentry per line. The hosts file is read and parsed every time\r\ndiscovery makes ping requests, thus a new version of the file that\r\nis published to the config directory will automatically be picked\r\nup.\r\n\r\nTODO:\r\n * Documentation for the plugin\r\n\r\nCloses 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