AngersZhuuuu commented on a change in pull request #29966:
URL: https://github.com/apache/spark/pull/29966#discussion_r532393977



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File path: core/src/main/scala/org/apache/spark/util/DependencyUtils.scala
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@@ -25,12 +25,104 @@ import org.apache.hadoop.conf.Configuration
 import org.apache.hadoop.fs.{FileSystem, Path}
 
 import org.apache.spark.{SecurityManager, SparkConf, SparkException}
+import org.apache.spark.deploy.SparkSubmitUtils
 import org.apache.spark.internal.Logging
-import org.apache.spark.util.{MutableURLClassLoader, Utils}
 
-private[deploy] object DependencyUtils extends Logging {
+private[spark] object DependencyUtils extends Logging {
+
+  def getIvyProperties(): Seq[String] = {
+    Seq(
+      "spark.jars.excludes",
+      "spark.jars.packages",
+      "spark.jars.repositories",
+      "spark.jars.ivy",
+      "spark.jars.ivySettings"
+    ).map(sys.props.get(_).orNull)
+  }
+
+
+  private def parseURLQueryParameter(queryString: String, queryTag: String): 
Array[String] = {
+    if (queryString == null || queryString.isEmpty) {
+      Array.empty[String]
+    } else {
+      val mapTokens = queryString.split("&")
+      assert(mapTokens.forall(_.split("=").length == 2)
+        , "Invalid URI query string: [ " + queryString + " ]")
+      mapTokens.map(_.split("=")).map(kv => (kv(0), kv(1))).filter(_._1 == 
queryTag).map(_._2)
+    }
+  }
+
+  /**
+   * Parse excluded list in ivy URL. When download ivy URL jar, Spark won't 
download transitive jar
+   * in excluded list.
+   *
+   * @param queryString Ivy URI query part string.
+   * @return Exclude list which contains grape parameters of exclude.
+   *         Example: Input:  
exclude=org.mortbay.jetty:jetty,org.eclipse.jetty:jetty-http
+   *         Output:  [org.mortbay.jetty:jetty, org.eclipse.jetty:jetty-http]
+   */
+  private def parseExcludeList(queryString: String): String = {
+    parseURLQueryParameter(queryString, "exclude")
+      .flatMap { excludeString =>
+        val excludes: Array[String] = excludeString.split(",")
+        assert(excludes.forall(_.split(":").length == 2),

Review comment:
       > ditto: `IllegalArgumentException`? btw, hive has the same behaviour 
with this?
   
   Yea,  hive have similar logical too.




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