t0mpere commented on code in PR #12307:
URL: https://github.com/apache/pinot/pull/12307#discussion_r1479941077


##########
pinot-spi/src/main/java/org/apache/pinot/spi/env/PinotConfiguration.java:
##########
@@ -201,16 +200,16 @@ private static Configuration loadProperties(String 
configPath) {
   private static Map<String, Object> relaxConfigurationKeys(Configuration 
configuration) {
     return CommonsConfigurationUtils.getKeysStream(configuration).distinct()
 
-        .collect(Collectors.toMap(PinotConfiguration::relaxPropertyName, key 
-> configuration.getProperty(key)));
+        .collect(Collectors.toMap(PinotConfiguration::relaxPropertyName, 
configuration::getProperty));
   }
 
   private static Map<String, String> relaxEnvironmentVariables(Map<String, 
String> environmentVariables) {
-    return environmentVariables.entrySet().stream().filter(entry -> 
entry.getKey().startsWith("PINOT_"))
+    return environmentVariables.entrySet().stream().filter(entry -> 
entry.getKey().startsWith(ENV_PREFIX))

Review Comment:
   After catching up, number two was implemented following:
   ```
   export PINOT_CONTROLLER_HOST=host
   export PINOT_SERVER_PROPERTY_WHATEVER=whatever_property
   export ANOTHER_VARIABLE=random
   
   -------------------- Config from CLI or Config Path ------------------------
   
   dynamic.env.config=pinot.controller.host,pinot.server.property,other.var
   pinot.controller.host=PINOT_CONTROLLER_HOST
   pinot.server.property=PINOT_SERVER_PROPERTY_WHATEVER
   other.var=ANOTHER_VARIABLE
   
   ---------------------------------------------------------------------------
   
   config gets templated at runtime with the content of the env vars.
   
   ----------------------- final result in memory ----------------------------
   
   dynamic.env.config=pinot.controller.host,pinot.server.property,other.var
   pinot.controller.host=host
   pinot.server.property=whatever_property
   other.var=random
   ```



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