{"action":"created","comment":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/comments/39353289","id":39353289,"diff_hunk":"@@ -37,5 +51,18 @@ protected void configure() {\n     handlerBinder.addBinding().to(LineageHandler.class);\n \n     bind(MetadataAdmin.class).to(DefaultMetadataAdmin.class);\n+    if (changePublishingRequired) {","path":"cdap-app-fabric/src/main/java/co/cask/cdap/metadata/MetadataServiceModule.java","position":35,"original_position":35,"commit_id":"b212478b8e7aa64cd3661b9bca71b575e7ce94ad","original_commit_id":"b212478b8e7aa64cd3661b9bca71b575e7ce94ad","user":{"login":"poornachandra","id":3181212,"avatar_url":"https://avatars.githubusercontent.com/u/3181212?v=3","gravatar_id":"","url":"https://api.github.com/users/poornachandra","html_url":"https://github.com/poornachandra","followers_url":"https://api.github.com/users/poornachandra/followers","following_url":"https://api.github.com/users/poornachandra/following{/other_user}","gists_url":"https://api.github.com/users/poornachandra/gists{/gist_id}","starred_url":"https://api.github.com/users/poornachandra/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/poornachandra/subscriptions","organizations_url":"https://api.github.com/users/poornachandra/orgs","repos_url":"https://api.github.com/users/poornachandra/repos","events_url":"https://api.github.com/users/poornachandra/events{/privacy}","received_events_url":"https://api.github.com/users/poornachandra/received_events","type":"User","site_admin":false},"body":"I think this should be restructured a bit. There are two different cases here -\r\n   1. Users do not want to publish metadata (I think you are planning on handling that in a later PR).\r\n   2. No metadata publishing for in-memory and standalone mode.\r\n\r\nFor point 1, we need to have a config parameter that will be used to control the publishing.\r\n\r\nFor point 2, we can directly bind `MetadataChangePublisher` to `NoOpMetadataChangePublisher` in `getSingleNodeModules()` and `getInMemoryModules()`, after extending  `MetadataServiceModule` from `RuntimeModule`","created_at":"2015-09-13T22:36:02Z","updated_at":"2015-09-13T22:36:02Z","html_url":"https://github.com/caskdata/cdap/pull/3920#discussion_r39353289","pull_request_url":"https://api.github.com/repos/caskdata/cdap/pulls/3920","_links":{"self":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/comments/39353289"},"html":{"href":"https://github.com/caskdata/cdap/pull/3920#discussion_r39353289"},"pull_request":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/3920"}}},"pull_request":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/3920","id":44879634,"html_url":"https://github.com/caskdata/cdap/pull/3920","diff_url":"https://github.com/caskdata/cdap/pull/3920.diff","patch_url":"https://github.com/caskdata/cdap/pull/3920.patch","issue_url":"https://api.github.com/repos/caskdata/cdap/issues/3920","number":3920,"state":"open","locked":false,"title":"[CDAP-3518] Added a MetadataChangePublisher to publish metadata chang…","user":{"login":"bdmogal","id":3895099,"avatar_url":"https://avatars.githubusercontent.com/u/3895099?v=3","gravatar_id":"","url":"https://api.github.com/users/bdmogal","html_url":"https://github.com/bdmogal","followers_url":"https://api.github.com/users/bdmogal/followers","following_url":"https://api.github.com/users/bdmogal/following{/other_user}","gists_url":"https://api.github.com/users/bdmogal/gists{/gist_id}","starred_url":"https://api.github.com/users/bdmogal/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bdmogal/subscriptions","organizations_url":"https://api.github.com/users/bdmogal/orgs","repos_url":"https://api.github.com/users/bdmogal/repos","events_url":"https://api.github.com/users/bdmogal/events{/privacy}","received_events_url":"https://api.github.com/users/bdmogal/received_events","type":"User","site_admin":false},"body":"…es to external systems. Also added a Kafka based implementation for this interface that publishes to a Kafka topic.\r\n\r\nJira: [CDAP-3518](https://issues.cask.co/browse/CDAP-3518)\r\nBuild: http://builds.cask.co/browse/CDAP-DUT2834\r\n\r\n","created_at":"2015-09-13T20:06:15Z","updated_at":"2015-09-13T22:36:02Z","closed_at":null,"merged_at":null,"merge_commit_sha":"b8a124a96a2ee6840de7ed6f7149447b52d596c8","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/caskdata/cdap/pulls/3920/commits","review_comments_url":"https://api.github.com/repos/caskdata/cdap/pulls/3920/comments","review_comment_url":"https://api.github.com/repos/caskdata/cdap/pulls/comments{/number}","comments_url":"https://api.github.com/repos/caskdata/cdap/issues/3920/comments","statuses_url":"https://api.github.com/repos/caskdata/cdap/statuses/b212478b8e7aa64cd3661b9bca71b575e7ce94ad","head":{"label":"caskdata:feature/metadata-notifications","ref":"feature/metadata-notifications","sha":"b212478b8e7aa64cd3661b9bca71b575e7ce94ad","user":{"login":"caskdata","id":8123023,"avatar_url":"https://avatars.githubusercontent.com/u/8123023?v=3","gravatar_id":"","url":"https://api.github.com/users/caskdata","html_url":"https://github.com/caskdata","followers_url":"https://api.github.com/users/caskdata/followers","following_url":"https://api.github.com/users/caskdata/following{/other_user}","gists_url":"https://api.github.com/users/caskdata/gists{/gist_id}","starred_url":"https://api.github.com/users/caskdata/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/caskdata/subscriptions","organizations_url":"https://api.github.com/users/caskdata/orgs","repos_url":"https://api.github.com/users/caskdata/repos","events_url":"https://api.github.com/users/caskdata/events{/privacy}","received_events_url":"https://api.github.com/users/caskdata/received_events","type":"Organization","site_admin":false},"repo":{"id":22542759,"name":"cdap","full_name":"caskdata/cdap","owner":{"login":"caskdata","id":8123023,"avatar_url":"https://avatars.githubusercontent.com/u/8123023?v=3","gravatar_id":"","url":"https://api.github.com/users/caskdata","html_url":"https://github.com/caskdata","followers_url":"https://api.github.com/users/caskdata/followers","following_url":"https://api.github.com/users/caskdata/following{/other_user}","gists_url":"https://api.github.com/users/caskdata/gists{/gist_id}","starred_url":"https://api.github.com/users/caskdata/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/caskdata/subscriptions","organizations_url":"https://api.github.com/users/caskdata/orgs","repos_url":"https://api.github.com/users/caskdata/repos","events_url":"https://api.github.com/users/caskdata/events{/privacy}","received_events_url":"https://api.github.com/users/caskdata/received_events","type":"Organization","site_admin":false},"private":false,"html_url":"https://github.com/caskdata/cdap","description":"Cask 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