[GitHub] [spark] viirya commented on a change in pull request #27690: [SPARK-21514][SQL] Added a new option to use non-blobstore storage when writing into blobstore storage

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viirya commented on a change in pull request #27690:
URL: https://github.com/apache/spark/pull/27690#discussion_r439623063



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File path: sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/SaveAsHiveFile.scala
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@@ -97,7 +99,34 @@ private[hive] trait SaveAsHiveFile extends DataWritingCommand {
       options = Map.empty)
   }
 
-  protected def getExternalTmpPath(
+  // Mostly copied from Context.java#getMRTmpPath of Hive 2.3.
+  // Visible for testing.
+  private[execution] def getMRTmpPath(
+      hadoopConf: Configuration,
+      sessionScratchDir: String,
+      scratchDir: String): Path = {
+
+    // Hive's getMRTmpPath uses nonLocalScratchPath + '-mr-10000',
+    // which is ruled by 'hive.exec.scratchdir' including file system.
+    // This is the same as Spark's #oldVersionExternalTempPath.
+    // Only difference between #oldVersionExternalTempPath and Hive 2.3.0's is HIVE-7090.
+    // HIVE-7090 added user_name/session_id on top of 'hive.exec.scratchdir'
+    // Here it uses session_path unless it's emtpy, otherwise uses scratchDir.
+    val sessionPath = if (!sessionScratchDir.isEmpty) sessionScratchDir else scratchDir
+    val mrScratchDir = oldVersionExternalTempPath(new Path(sessionPath), hadoopConf, sessionPath)

Review comment:
       Any benefit to use sessionScratchDir here except for following Hive?




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