eric-maynard commented on code in PR #1959:
URL: https://github.com/apache/polaris/pull/1959#discussion_r2183971283


##########
polaris-core/src/main/java/org/apache/polaris/core/config/PolarisConfigurationStore.java:
##########
@@ -99,7 +99,25 @@ public interface PolarisConfigurationStore {
    */
   default <T> @Nonnull T getConfiguration(
       @Nonnull RealmContext realmContext, PolarisConfiguration<T> config) {
-    T result = getConfiguration(realmContext, config.key, config.defaultValue);
+    T result = getConfiguration(realmContext, config.key);
+
+    if (result == null && config.hasLegacyKeys()) {
+      for (String legacyKey : config.legacyKeys) {
+        result = getConfiguration(realmContext, legacyKey);
+        if (result != null) {
+          LOGGER.warn(
+              "Legacy configuration key '{}' is in use. Please use '{}' 
instead.",
+              legacyKey,
+              config.key);
+          break;

Review Comment:
   Not sure we want a break here
   1. If multiple legacy keys really are in use, we should want to log for each 
of them
   2. Barring the above, you could just early return rather than `break`



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