{"action":"created","comment":{"url":"https://api.github.com/repos/zsxwing/spark/pulls/comments/55572029","id":55572029,"diff_hunk":"@@ -59,6 +59,19 @@ class StreamExecution(\n   private val sources =\n     logicalPlan.collect { case s: StreamingRelation => s.source }\n \n+  private val metadataLog: Option[MetadataLog[Offset]] =\n+    try {\n+      Some(new HDFSMetadataLog[Offset](sqlContext, sqlContext.getConf(\"stream.metadata.path\")))","path":"sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamExecution.scala","position":6,"original_position":6,"commit_id":"11e3a303673c293c707c99189bfbac78969980c1","original_commit_id":"226f40ee0e98b20313dd4e98abd79f06eab3aa65","user":{"login":"marmbrus","id":527,"avatar_url":"https://avatars.githubusercontent.com/u/527?v=3","gravatar_id":"","url":"https://api.github.com/users/marmbrus","html_url":"https://github.com/marmbrus","followers_url":"https://api.github.com/users/marmbrus/followers","following_url":"https://api.github.com/users/marmbrus/following{/other_user}","gists_url":"https://api.github.com/users/marmbrus/gists{/gist_id}","starred_url":"https://api.github.com/users/marmbrus/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/marmbrus/subscriptions","organizations_url":"https://api.github.com/users/marmbrus/orgs","repos_url":"https://api.github.com/users/marmbrus/repos","events_url":"https://api.github.com/users/marmbrus/events{/privacy}","received_events_url":"https://api.github.com/users/marmbrus/received_events","type":"User","site_admin":false},"body":"maybe toss the query name in here for now?","created_at":"2016-03-09T19:17:01Z","updated_at":"2016-03-09T19:17:01Z","html_url":"https://github.com/zsxwing/spark/pull/2#discussion_r55572029","pull_request_url":"https://api.github.com/repos/zsxwing/spark/pulls/2","_links":{"self":{"href":"https://api.github.com/repos/zsxwing/spark/pulls/comments/55572029"},"html":{"href":"https://github.com/zsxwing/spark/pull/2#discussion_r55572029"},"pull_request":{"href":"https://api.github.com/repos/zsxwing/spark/pulls/2"}}},"pull_request":{"url":"https://api.github.com/repos/zsxwing/spark/pulls/2","id":62153486,"html_url":"https://github.com/zsxwing/spark/pull/2","diff_url":"https://github.com/zsxwing/spark/pull/2.diff","patch_url":"https://github.com/zsxwing/spark/pull/2.patch","issue_url":"https://api.github.com/repos/zsxwing/spark/issues/2","number":2,"state":"open","locked":false,"title":"[WIP][PROTOTYPE] Add MetadataLog and HDFSMetadataLog","user":{"login":"zsxwing","id":1000778,"avatar_url":"https://avatars.githubusercontent.com/u/1000778?v=3","gravatar_id":"","url":"https://api.github.com/users/zsxwing","html_url":"https://github.com/zsxwing","followers_url":"https://api.github.com/users/zsxwing/followers","following_url":"https://api.github.com/users/zsxwing/following{/other_user}","gists_url":"https://api.github.com/users/zsxwing/gists{/gist_id}","starred_url":"https://api.github.com/users/zsxwing/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/zsxwing/subscriptions","organizations_url":"https://api.github.com/users/zsxwing/orgs","repos_url":"https://api.github.com/users/zsxwing/repos","events_url":"https://api.github.com/users/zsxwing/events{/privacy}","received_events_url":"https://api.github.com/users/zsxwing/received_events","type":"User","site_admin":false},"body":"## What changes were proposed in this pull request?\r\n\r\n- [x] Add MetadataLog and HDFSMetadataLog for metadata reliably storage.\r\n- [x] Update FileStreamSource to use HDFSMetadataLog instead of managing metadata by itself.\r\n- [x] Add FileStreamSink\r\n- [x] Update StreamExecution to use HDFSMetadataLog to manage the progress. 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