{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/40180971","id":40180971,"diff_hunk":"@@ -36,8 +38,8 @@ case class BatchInfo(\n     streamIdToInputInfo: Map[Int, StreamInputInfo],\n     submissionTime: Long,\n     processingStartTime: Option[Long],\n-    processingEndTime: Option[Long]\n-  ) {\n+    processingEndTime: Option[Long],\n+    private[streaming] val failureReasons: Map[Int, String] = Map.empty) {","path":"streaming/src/main/scala/org/apache/spark/streaming/scheduler/BatchInfo.scala","position":16,"original_position":16,"commit_id":"a1439e0d87755c80b0f6b756ec8a76345c1f1453","original_commit_id":"a1439e0d87755c80b0f6b756ec8a76345c1f1453","user":{"login":"tdas","id":663212,"avatar_url":"https://avatars.githubusercontent.com/u/663212?v=3","gravatar_id":"","url":"https://api.github.com/users/tdas","html_url":"https://github.com/tdas","followers_url":"https://api.github.com/users/tdas/followers","following_url":"https://api.github.com/users/tdas/following{/other_user}","gists_url":"https://api.github.com/users/tdas/gists{/gist_id}","starred_url":"https://api.github.com/users/tdas/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tdas/subscriptions","organizations_url":"https://api.github.com/users/tdas/orgs","repos_url":"https://api.github.com/users/tdas/repos","events_url":"https://api.github.com/users/tdas/events{/privacy}","received_events_url":"https://api.github.com/users/tdas/received_events","type":"User","site_admin":false},"body":"Wouldnt having another parameter in the constructor break binary compatibility, even if optional? I am scared of Scala doing crazy stuff. 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