{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/29811379","id":29811379,"diff_hunk":"@@ -748,6 +759,12 @@ private[spark] class ExternalSorter[K, V, C](\n \n     context.taskMetrics.memoryBytesSpilled += memoryBytesSpilled\n     context.taskMetrics.diskBytesSpilled += diskBytesSpilled\n+    context.taskMetrics.shuffleWriteMetrics.filter(_ => bypassMergeSort).foreach { m =>","path":"core/src/main/scala/org/apache/spark/util/collection/ExternalSorter.scala","position":42,"original_position":42,"commit_id":"591f2e9fc1b0c3a503394b7309a71b22dbfabc08","original_commit_id":"591f2e9fc1b0c3a503394b7309a71b22dbfabc08","user":{"login":"JoshRosen","id":50748,"avatar_url":"https://avatars.githubusercontent.com/u/50748?v=3","gravatar_id":"","url":"https://api.github.com/users/JoshRosen","html_url":"https://github.com/JoshRosen","followers_url":"https://api.github.com/users/JoshRosen/followers","following_url":"https://api.github.com/users/JoshRosen/following{/other_user}","gists_url":"https://api.github.com/users/JoshRosen/gists{/gist_id}","starred_url":"https://api.github.com/users/JoshRosen/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/JoshRosen/subscriptions","organizations_url":"https://api.github.com/users/JoshRosen/orgs","repos_url":"https://api.github.com/users/JoshRosen/repos","events_url":"https://api.github.com/users/JoshRosen/events{/privacy}","received_events_url":"https://api.github.com/users/JoshRosen/received_events","type":"User","site_admin":false},"body":"I was reading through `ExternalSorter` to try to understand how shuffle write time metrics are calculated and came across this line.  This style is confusing to a casual reader: it looks like the logic here is \"if shuffle write metrics are defined and merge sort is bypassed, then run this block\", but this is slightly obfuscated by the fact that we're filtering an option with a filter function that doesn't depend on that option's value.\r\n\r\nFor next time, I think we should just use a simple `if` statement instead.","created_at":"2015-05-06T23:00:36Z","updated_at":"2015-05-06T23:00:36Z","html_url":"https://github.com/apache/spark/pull/3422#discussion_r29811379","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/3422","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/29811379"},"html":{"href":"https://github.com/apache/spark/pull/3422#discussion_r29811379"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/3422"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/3422","id":24904301,"html_url":"https://github.com/apache/spark/pull/3422","diff_url":"https://github.com/apache/spark/pull/3422.diff","patch_url":"https://github.com/apache/spark/pull/3422.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/3422","number":3422,"state":"closed","locked":false,"title":"[SPARK-4479][SQL] Avoids unnecessary defensive copies when sort based shuffle is on","user":{"login":"liancheng","id":230655,"avatar_url":"https://avatars.githubusercontent.com/u/230655?v=3","gravatar_id":"","url":"https://api.github.com/users/liancheng","html_url":"https://github.com/liancheng","followers_url":"https://api.github.com/users/liancheng/followers","following_url":"https://api.github.com/users/liancheng/following{/other_user}","gists_url":"https://api.github.com/users/liancheng/gists{/gist_id}","starred_url":"https://api.github.com/users/liancheng/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/liancheng/subscriptions","organizations_url":"https://api.github.com/users/liancheng/orgs","repos_url":"https://api.github.com/users/liancheng/repos","events_url":"https://api.github.com/users/liancheng/events{/privacy}","received_events_url":"https://api.github.com/users/liancheng/received_events","type":"User","site_admin":false},"body":"This PR is a workaround for SPARK-4479. Two changes are introduced: when merge sort is bypassed in `ExternalSorter`,\r\n\r\n1. also bypass RDD elements buffering as buffering is the reason that `MutableRow` backed row objects must be copied, and\r\n2. avoids defensive copies in `Exchange` operator\n\n<!-- Reviewable:start -->\n[<img src=\"https://reviewable.io/review_button.png\" height=40 alt=\"Review on Reviewable\"/>](https://reviewable.io/reviews/apache/spark/3422)\n<!-- Reviewable:end 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