[KYUUBI #6402]: engine.share.level=GROUP enable for a list of hadoop …

…groups

docs/configuration/settings.md

@@ -509,6 +509,7 @@ You can configure the Kyuubi properties in `$KYUUBI_HOME/conf/kyuubi-defaults.co
 | kyuubi.session.idle.timeout                             | PT6H                    | session idle timeout, it will be closed when it's not accessed for this duration                                                                                                                                                                                                                                                                                                                                         | duration | 1.2.0  |
 | kyuubi.session.local.dir.allow.list                                              || The local dir list that are allowed to access by the kyuubi session application.  End-users might set some parameters such as `spark.files` and it will  upload some local files when launching the kyuubi engine, if the local dir allow list is defined, kyuubi will check whether the path to upload is in the allow list. Note that, if it is empty, there is no limitation for that. And please use absolute paths. | set      | 1.6.0  |
 | kyuubi.session.name                                     | <undefined>       | A human readable name of the session and we use empty string by default. This name will be recorded in the event. Note that, we only apply this value from session conf.                                                                                                                                                                                                                                                 | string   | 1.4.0  |
+| kyuubi.session.preferGroup                              | <undefined>       | The group name for the group engine launch. This will be checked for thepresence of the specified group in the user's allowed groups. If present,it will take precedence for GROUP SHARE LEVEL execution. If this is notconfigured, the session will use the first group name from the list ofgroups as the primary group.                                                                                               | string   | 1.9.3  |
 | kyuubi.session.proxy.user                               | <undefined>       | An alternative to hive.server2.proxy.user. The current behavior is consistent with hive.server2.proxy.user and now only takes effect in RESTFul API. When both parameters are set, kyuubi.session.proxy.user takes precedence.                                                                                                                                                                                           | string   | 1.9.0  |
 | kyuubi.session.timeout                                  | PT6H                    | (deprecated)session timeout, it will be closed when it's not accessed for this duration                                                                                                                                                                                                                                                                                                                                  | duration | 1.0.0  |
 | kyuubi.session.user.sign.enabled                        | false                   | Whether to verify the integrity of session user name on the engine side, e.g. Authz plugin in Spark.                                                                                                                                                                                                                                                                                                                     | boolean  | 1.7.0  |

kyuubi-common/src/main/scala/org/apache/kyuubi/config/KyuubiConf.scala

@@ -2779,6 +2779,17 @@ object KyuubiConf {
       }
       .createWithDefault("hadoop")
 
+  val PREFERRED_GROUP: OptionalConfigEntry[String] =
+    buildConf("kyuubi.session.preferGroup")
+      .doc("The group name for the group engine launch. This will be checked for the" +
+        "presence of the specified group in the user's allowed groups. If present," +
+        "it will take precedence for GROUP SHARE LEVEL execution. If this is not" +
+        "configured, the session will use the first group name from the list of" +
+        "groups as the primary group.")
+      .version("1.9.3")
+      .stringConf
+      .createOptional
+
   val SERVER_NAME: OptionalConfigEntry[String] =
     buildConf("kyuubi.server.name")
       .doc("The name of Kyuubi Server.")

kyuubi-server/src/main/scala/org/apache/kyuubi/engine/EngineRef.scala

@@ -98,7 +98,10 @@ private[kyuubi] class EngineRef(
   }
 
   // user for launching engine
-  private[kyuubi] val appUser: String = if (doAsEnabled) routingUser else Utils.currentUser
+  private[kyuubi] val appUser: String = shareLevel match {
+    case GROUP => if (doAsEnabled) sessionUser else Utils.currentUser
+    case _ => if (doAsEnabled) routingUser else Utils.currentUser
+  }
 
   @VisibleForTesting
   private[kyuubi] val subdomain: String = conf.get(ENGINE_SHARE_LEVEL_SUBDOMAIN) match {

kyuubi-server/src/main/scala/org/apache/kyuubi/session/HadoopGroupProvider.scala

@@ -22,15 +22,33 @@ import java.util.{Map => JMap}
 import org.apache.hadoop.security.UserGroupInformation
 
 import org.apache.kyuubi.Logging
+import org.apache.kyuubi.config.KyuubiConf
 import org.apache.kyuubi.plugin.GroupProvider
 
 /**
  * Hadoop based group provider, see more information at
  * https://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-common/GroupsMapping.html
  */
 class HadoopGroupProvider extends GroupProvider with Logging {
-  override def primaryGroup(user: String, sessionConf: JMap[String, String]): String =
-    groups(user, sessionConf).head
+  override def primaryGroup(user: String, sessionConf: JMap[String, String]): String = {
+    val preferredGroup: Option[String] = if (sessionConf != null) {
+      Option(sessionConf.get(KyuubiConf.PREFERRED_GROUP.key))
+    } else {
+      None
+    }
+
+    val userGroups: Array[String] = groups(user, sessionConf)
+
+    val primaryGroup = preferredGroup match {
+      case Some(group) if userGroups.contains(group) => group
+      case None => userGroups.headOption.getOrElse {
+          throw new NoSuchElementException("No groups available for the user")
+        }
+      case Some(group) =>
+        throw new IllegalArgumentException(s"User is not part of the preferred group: $group")
+    }
+    primaryGroup
+  }
 
   override def groups(user: String, sessionConf: JMap[String, String]): Array[String] =
     UserGroupInformation.createRemoteUser(user).getGroupNames match {

kyuubi-server/src/test/scala/org/apache/kyuubi/operation/KyuubiOperationPerGroupSuite.scala

@@ -68,12 +68,24 @@ class KyuubiOperationPerGroupSuite extends WithKyuubiServer with SparkQueryTests
   }
 
   test("kyuubi defined function - system_user/session_user") {
-    withSessionConf(Map("hive.server2.proxy.user" -> "user1"))(Map.empty)(Map.empty) {
+    withSessionConf(Map("hive.server2.proxy.user" -> "user2"))(Map.empty)(Map.empty) {
       withJdbcStatement() { statement =>
         val res = statement.executeQuery("select system_user() as c1, session_user() as c2")
         assert(res.next())
-        assert(res.getString("c1") === "testGG")
-        assert(res.getString("c2") === "user1")
+        assert(res.getString("c1") === "user1")
+        assert(res.getString("c2") === "user2")
+      }
+    }
+  }
+
+  test("ensure preferred group is chosen from list of groups") {
+    withSessionConf(Map("hive.server2.proxy.user" -> "user1"))(Map(
+      KyuubiConf.PREFERRED_GROUP.key -> "group_tt"))(Map.empty) {
+      withJdbcStatement() { statement =>
+        val res = statement.executeQuery("set spark.app.name")
+        assert(res.next())
+        val engineName = res.getString("value")
+        assert(engineName.startsWith(s"kyuubi_GROUP_${conf.get(KyuubiConf.ENGINE_TYPE)}_group_tt"))
       }
     }
   }