{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/59255827","id":59255827,"diff_hunk":"@@ -123,8 +123,16 @@ case class DataSource(\n     }\n   }\n \n-  /** Returns a source that can be used to continually read data. */\n-  def createSource(): Source = {\n+  /**\n+   * Returns a source that can be used to continually read data.\n+   *\n+   * Before running a real query (e.g., df.explain), `sourceId` and `checkpointLocation` is None\n+   * as they are unknown. [[ContinuousQueryManager]] should set `sourceId` and `checkpointLocation`\n+   * before starting a query.\n+   */\n+  def createSource(\n+      sourceId: Option[Long] = None,\n+      checkpointLocation: Option[String] = None): Source = {","path":"sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSource.scala","position":15,"original_position":15,"commit_id":"d161f3adb978dc4ed519eb3318731ac05c247f5b","original_commit_id":"d161f3adb978dc4ed519eb3318731ac05c247f5b","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":"Yeah, and we also don't really need to create a source there (we only need to know the schema).  Perhaps getting the schema should be separated from getting the source (like we do in FileFormat).","created_at":"2016-04-11T18:27:34Z","updated_at":"2016-04-11T18:27:34Z","html_url":"https://github.com/apache/spark/pull/12247#discussion_r59255827","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/12247","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/59255827"},"html":{"href":"https://github.com/apache/spark/pull/12247#discussion_r59255827"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/12247"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/12247","id":65716427,"html_url":"https://github.com/apache/spark/pull/12247","diff_url":"https://github.com/apache/spark/pull/12247.diff","patch_url":"https://github.com/apache/spark/pull/12247.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/12247","number":12247,"state":"open","locked":false,"title":"[SPARK-14474][SQL]Move FileSource offset log into checkpointLocation","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\nNow that we have a single location for storing checkpointed state. This PR just propagates the checkpoint location into FileStreamSource so that we don't have one random log off on its own.\r\n\r\n## How was this patch tested?\r\n\r\ntest(\"metadataPath should be in checkpointLocation\")","created_at":"2016-04-07T23:31:38Z","updated_at":"2016-04-11T18:27:34Z","closed_at":null,"merged_at":null,"merge_commit_sha":"b228208bbcac48ee1ea4f850875763dca959667f","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/apache/spark/pulls/12247/commits","review_comments_url":"https://api.github.com/repos/apache/spark/pulls/12247/comments","review_comment_url":"https://api.github.com/repos/apache/spark/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/spark/issues/12247/comments","statuses_url":"https://api.github.com/repos/apache/spark/statuses/d161f3adb978dc4ed519eb3318731ac05c247f5b","head":{"label":"zsxwing:file-source-log-location","ref":"file-source-log-location","sha":"d161f3adb978dc4ed519eb3318731ac05c247f5b","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},"repo":{"id":17894272,"name":"spark","full_name":"zsxwing/spark","owner":{"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},"private":false,"html_url":"https://github.com/zsxwing/spark","description":"Mirror 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