pan3793 commented on code in PR #6383:
URL: https://github.com/apache/kyuubi/pull/6383#discussion_r1635773630


##########
kyuubi-server/src/main/scala/org/apache/kyuubi/engine/flink/FlinkProcessBuilder.scala:
##########
@@ -58,14 +61,30 @@ class FlinkProcessBuilder(
   // flink.execution.target are required in Kyuubi conf currently
   val executionTarget: Option[String] = 
conf.getOption("flink.execution.target")
 
+  private lazy val proxyUserEnable: Boolean = {
+    doAsEnabled && conf.get(ENGINE_FLINK_DOAS_ENABLED) &&
+    conf.getOption(s"$FLINK_CONF_PREFIX.$FLINK_SECURITY_KEYTAB_KEY").isEmpty &&
+    conf.getOption(s"$FLINK_CONF_PREFIX.$FLINK_SECURITY_PRINCIPAL_KEY").isEmpty
+  }
+
   override protected def module: String = "kyuubi-flink-sql-engine"
 
   override protected def mainClass: String = 
"org.apache.kyuubi.engine.flink.FlinkSQLEngine"
 
-  override def env: Map[String, String] = conf.getEnvs +
-    ("FLINK_CONF_DIR" -> conf.getEnvs.getOrElse(
-      "FLINK_CONF_DIR",
-      s"$flinkHome${File.separator}conf"))
+  override def env: Map[String, String] = {
+    val flinkExtraEnvs = if (proxyUserEnable) {
+      Map(
+        "FLINK_CONF_DIR" -> conf.getEnvs.getOrElse(
+          "FLINK_CONF_DIR",
+          s"$flinkHome${File.separator}conf"),

Review Comment:
   code style here is a little bit ugly. does int work on Windows? if not, just 
replace `${File.separator}` with `/`



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