zhouyifan279 commented on a change in pull request #1015:
URL: https://github.com/apache/incubator-kyuubi/pull/1015#discussion_r701635269



##########
File path: 
kyuubi-server/src/main/scala/org/apache/kyuubi/credentials/HadoopDelegationProvider.scala
##########
@@ -0,0 +1,53 @@
+/*
+ * 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 org.apache.hadoop.conf.Configuration
+import org.apache.hadoop.security.Credentials
+
+import org.apache.kyuubi.Logging
+import org.apache.kyuubi.config.KyuubiConf
+
+trait HadoopDelegationTokenProvider extends Logging {
+
+  /**
+   * Name of the service to provide delegation tokens. This name should be 
unique. Kyuubi will
+   * internally use this name to differentiate delegation token providers.
+   */
+  def serviceName: String
+
+  /**
+   * Returns true if delegation tokens are required for this service. By 
default, it is based on
+   * whether Hadoop security is enabled.
+   */
+  def delegationTokensRequired(hadoopConf: Configuration, kyuubiConf: 
KyuubiConf): Boolean

Review comment:
       `kyuubiConf` is needed because some providers (if we need to implement 
in the future), eg kafka, can read configs(server address, or client config 
file path ) from KyuubiConf;
   `hadoopConf`can be created using `KyuubiHadoopUtils#newHadoopConf`in each 
providers. But maybe it is better to keep this logic outside providers to make 
it a little simpler to write the provider.
   Besides, it will be easier if we want to change `hadoopConf`'s loading logic.




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