{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/169967506","pull_request_review_id":98579309,"id":169967506,"diff_hunk":"@@ -1129,6 +1129,12 @@ object MimaExcludes {\n       ProblemFilters.exclude[InheritedNewAbstractMethodProblem](\"org.apache.spark.ml.param.shared.HasLoss.org$apache$spark$ml$param$shared$HasLoss$_setter_$loss_=\"),\n       ProblemFilters.exclude[InheritedNewAbstractMethodProblem](\"org.apache.spark.ml.param.shared.HasLoss.getLoss\"),\n       ProblemFilters.exclude[InheritedNewAbstractMethodProblem](\"org.apache.spark.ml.param.shared.HasLoss.loss\")\n+    ) ++ Seq(\n+      // [SPARK-9853][Core] Optimize shuffle fetch of contiguous partition IDs.\n+      ProblemFilters.exclude[MissingTypesProblem](\"org.apache.spark.FetchFailed$\"),","path":"project/MimaExcludes.scala","position":6,"original_position":6,"commit_id":"583666bf5ae6102180851fa1cc3129cc344e919c","original_commit_id":"583666bf5ae6102180851fa1cc3129cc344e919c","user":{"login":"cloud-fan","id":3182036,"avatar_url":"https://avatars3.githubusercontent.com/u/3182036?v=4","gravatar_id":"","url":"https://api.github.com/users/cloud-fan","html_url":"https://github.com/cloud-fan","followers_url":"https://api.github.com/users/cloud-fan/followers","following_url":"https://api.github.com/users/cloud-fan/following{/other_user}","gists_url":"https://api.github.com/users/cloud-fan/gists{/gist_id}","starred_url":"https://api.github.com/users/cloud-fan/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/cloud-fan/subscriptions","organizations_url":"https://api.github.com/users/cloud-fan/orgs","repos_url":"https://api.github.com/users/cloud-fan/repos","events_url":"https://api.github.com/users/cloud-fan/events{/privacy}","received_events_url":"https://api.github.com/users/cloud-fan/received_events","type":"User","site_admin":false},"body":"yup","created_at":"2018-02-22T14:18:48Z","updated_at":"2018-02-22T14:18:48Z","html_url":"https://github.com/apache/spark/pull/19788#discussion_r169967506","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/19788","author_association":"CONTRIBUTOR","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/169967506"},"html":{"href":"https://github.com/apache/spark/pull/19788#discussion_r169967506"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/19788"}},"in_reply_to_id":169898393},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/19788","id":153562241,"html_url":"https://github.com/apache/spark/pull/19788","diff_url":"https://github.com/apache/spark/pull/19788.diff","patch_url":"https://github.com/apache/spark/pull/19788.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/19788","number":19788,"state":"open","locked":false,"title":"[SPARK-9853][Core] Optimize shuffle fetch of contiguous partition IDs","user":{"login":"yucai","id":2989575,"avatar_url":"https://avatars0.githubusercontent.com/u/2989575?v=4","gravatar_id":"","url":"https://api.github.com/users/yucai","html_url":"https://github.com/yucai","followers_url":"https://api.github.com/users/yucai/followers","following_url":"https://api.github.com/users/yucai/following{/other_user}","gists_url":"https://api.github.com/users/yucai/gists{/gist_id}","starred_url":"https://api.github.com/users/yucai/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/yucai/subscriptions","organizations_url":"https://api.github.com/users/yucai/orgs","repos_url":"https://api.github.com/users/yucai/repos","events_url":"https://api.github.com/users/yucai/events{/privacy}","received_events_url":"https://api.github.com/users/yucai/received_events","type":"User","site_admin":false},"body":"## What changes were proposed in this pull request?\r\n\r\nIn adaptive execution, one reducer will fetch multiple consecutive partitions from one map output file (see details in PR#9276), currently, it needs many separate getBlock calls, and this fix is to support fetching those consecutive partitions in one disk read.\r\n\r\n## How was this patch tested?\r\n\r\nAdd new unit tests, AdaptiveSchedulingSuite, BlockIdSuite 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