[GitHub] [spark] xkrogen commented on a change in pull request #34120: [SPARK-35672][CORE][YARN] Pass user classpath entries to executors using config instead of command line.

[GitBox <gi...@apache.org>]

xkrogen commented on a change in pull request #34120:
URL: https://github.com/apache/spark/pull/34120#discussion_r726474304



##########
File path: resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala
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@@ -1470,6 +1471,90 @@ private object Client extends Logging {
     (mainUri ++ secondaryUris).toArray
   }
 
+  /**
+   * Returns a list of local, absolute file URLs representing the user classpath. Note that this
+   * must be executed on the same host which will access the URLs, as it will resolve relative
+   * paths based on the current working directory, as well as environment variables.
+   * See SPARK-35672 for discussion of why it is necessary to do environment variable substitution.
+   *
+   * @param conf Spark configuration.
+   * @param useClusterPath Whether to use the 'cluster' path when resolving paths with the
+   *                       `local` scheme. This should be used when running on the cluster, but
+   *                       not when running on the gateway (i.e. for the driver in `client` mode).
+   * @return Array of local URLs ready to be passed to a [[java.net.URLClassLoader]].
+   */
+  def getUserClasspathUrls(conf: SparkConf, useClusterPath: Boolean): Array[URL] = {
+    Client.getUserClasspath(conf).map { uri =>
+      val inputPath = uri.getPath
+      val replacedFilePath = if (Utils.isLocalUri(uri.toString) && useClusterPath) {
+        Client.getClusterPath(conf, inputPath)
+      } else {
+        // Any other URI schemes should have been resolved by this point
+        assert(uri.getScheme == null || uri.getScheme == "file" || Utils.isLocalUri(uri.toString),
+          "getUserClasspath should only return 'file' or 'local' URIs but found: " + uri)
+        inputPath
+      }
+      val envVarResolvedFilePath = replaceEnvVars(replacedFilePath, sys.env)
+      Paths.get(envVarResolvedFilePath).toAbsolutePath.toUri.toURL
+    }
+  }
+
+  // scalastyle:off line.size.limit
+  /**
+   * Replace environment variables in a string according to the same rules as [[Environment]]:
+   * `$VAR_NAME` for Unix, `%VAR_NAME%` for Windows, and `{{VAR_NAME}}` for all OS.
+   * This support escapes for `$` and `%` characters, e.g.
+   * `\$FOO`, `^%FOO^%`, and `%%FOO%%` will be resolved to `$FOO`, `%FOO%`, and `%FOO%`,
+   * respectively, instead of being treated as variable names. Note that Unix variable naming
+   * conventions (alphanumeric plus underscore, case-sensitive, can't start with a digit) are
+   * used for both Unix and Windows, following the convention of Hadoop's [[Shell]]
+   * (see specifically [[Shell.getEnvironmentVariableRegex]]).
+   *
+   * @param unresolvedString The unresolved string which may contain variable references.
+   * @param env The System environment
+   * @param isWindows True iff running in a Windows environment
+   * @return The input string with variables replaced with their values from `env`
+   * @see [[https://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap08.html Environment Variables (IEEE Std 1003.1-2017)]]
+   * @see [[https://en.wikibooks.org/wiki/Windows_Batch_Scripting#Quoting_and_escaping Windows Batch Scripting | Quoting and Escaping]]
+   */
+  // scalastyle:on line.size.limit
+  def replaceEnvVars(

Review comment:
       Agreed, thanks for the suggestion!




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