desaijay230592 commented on a change in pull request #6842:
URL: https://github.com/apache/incubator-pinot/pull/6842#discussion_r630384926



##########
File path: 
pinot-spi/src/main/java/org/apache/pinot/spi/environmentprovider/PinotEnvironmentProvider.java
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@@ -0,0 +1,42 @@
+/**
+ * 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.pinot.spi.environmentprovider;
+
+import java.util.Map;
+import org.apache.pinot.spi.env.PinotConfiguration;
+
+/**
+ *  Environment Provider interface implemented by different cloud providers to 
customize
+ *  the base pinot configuration to add environment variables & instance 
specific configuration
+ */
+public interface PinotEnvironmentProvider {
+
+  String INSTANCE_FAILURE_DOMAIN = "pinot.environment.instance.failureDomain";
+
+  /**
+   * Customize base pinot configuration to add environment variables & 
instance specific configuration
+   * @return custom pinot configuration map
+   */
+  Map<String, Object> getEnvironment();

Review comment:
       We are relying on parsing the map in the HelixServerStarter. Also the 
reason for returning a map is if we decide to add more cloud environment 
specific variables (for now its only failure domain) then we can leverage the 
map at Server Starter layer to make ZK instance config write/updates. We are 
maintaining a Map<String, Map<String, String>> which gets updated with the 
above environment properties and Pinot recognizes it to update the mapFields. 
So returning a Map from EnvironmentProvider should not be an issue. 




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