ulysses-you commented on a change in pull request #1029:
URL: https://github.com/apache/incubator-kyuubi/pull/1029#discussion_r702799757



##########
File path: 
kyuubi-server/src/main/scala/org/apache/kyuubi/credentials/HadoopFsDelegationTokenProvider.scala
##########
@@ -0,0 +1,104 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.kyuubi.credentials
+
+import java.lang.reflect.UndeclaredThrowableException
+import java.security.PrivilegedExceptionAction
+
+import org.apache.hadoop.conf.Configuration
+import org.apache.hadoop.fs.{FileSystem, Path}
+import org.apache.hadoop.security.{Credentials, UserGroupInformation}
+
+import org.apache.kyuubi.Logging
+import org.apache.kyuubi.config.KyuubiConf
+import 
org.apache.kyuubi.credentials.HadoopFsDelegationTokenProvider.{disableFsCache, 
doAsProxyUser}
+
+class HadoopFsDelegationTokenProvider extends HadoopDelegationTokenProvider 
with Logging {
+
+  override val serviceName: String = "hadoopfs"
+
+  private var internalConf: Configuration = _
+
+  override def delegationTokensRequired(
+      hadoopConf: Configuration,
+      kyuubiConf: KyuubiConf): Boolean = {
+    UserGroupInformation.isSecurityEnabled

Review comment:
       shall we call `UserGroupInformation.setConfiguration` before ?

##########
File path: 
kyuubi-server/src/main/scala/org/apache/kyuubi/credentials/HadoopFsDelegationTokenProvider.scala
##########
@@ -0,0 +1,104 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.kyuubi.credentials
+
+import java.lang.reflect.UndeclaredThrowableException
+import java.security.PrivilegedExceptionAction
+
+import org.apache.hadoop.conf.Configuration
+import org.apache.hadoop.fs.{FileSystem, Path}
+import org.apache.hadoop.security.{Credentials, UserGroupInformation}
+
+import org.apache.kyuubi.Logging
+import org.apache.kyuubi.config.KyuubiConf
+import 
org.apache.kyuubi.credentials.HadoopFsDelegationTokenProvider.{disableFsCache, 
doAsProxyUser}
+
+class HadoopFsDelegationTokenProvider extends HadoopDelegationTokenProvider 
with Logging {
+
+  override val serviceName: String = "hadoopfs"
+
+  private var internalConf: Configuration = _
+
+  override def delegationTokensRequired(
+      hadoopConf: Configuration,
+      kyuubiConf: KyuubiConf): Boolean = {
+    UserGroupInformation.isSecurityEnabled
+  }
+
+  override def obtainDelegationTokens(
+      hadoopConf: Configuration,
+      kyuubiConf: KyuubiConf,
+      owner: String,
+      creds: Credentials): Unit = {
+    // A FileSystem object are cached in FileSystem.CACHE by a composite key.
+    // The UserGroupInformation object used to create it is part of that key.
+    // If cache is enabled, new FileSystem objects are cached at every method 
invocation.
+    if (internalConf == null) {
+      internalConf = disableFsCache(kyuubiConf, hadoopConf)

Review comment:
       why we cache `internalConf ` but not cache `filesystem`. isn't it should 
be same ?




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