eolivelli commented on a change in pull request #9612:
URL: https://github.com/apache/pulsar/pull/9612#discussion_r580090240



##########
File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/schema/SchemaRegistryServiceImpl.java
##########
@@ -293,12 +295,28 @@ private void checkCompatible(SchemaAndMetadata 
existingSchema, SchemaData newSch
             SchemaData schemaData) {
         final CompletableFuture<SchemaVersion> completableFuture = new 
CompletableFuture<>();
         SchemaVersion schemaVersion;
-        for (SchemaAndMetadata schemaAndMetadata : schemaAndMetadataList) {
-            if 
(Arrays.equals(hashFunction.hashBytes(schemaAndMetadata.schema.getData()).asBytes(),
-                    hashFunction.hashBytes(schemaData.getData()).asBytes())) {
-                schemaVersion = schemaAndMetadata.version;
-                completableFuture.complete(schemaVersion);
-                return completableFuture;
+        if (schemaData.getData().length != 0) {
+            Schema.Parser parser = new Schema.Parser();
+            Schema newSchema = parser.parse(new String(schemaData.getData(), 
UTF_8));

Review comment:
       Sorry I was not clear.
   My comment is more about having code coverage for the condition about 
PROTOBUF.
   if we add an explicit unit test about the fact that with PROTOBUF we are 
performing your new code, we are sure that we won't lose this implementation in 
the future.
   
   Probably adding an utility method `isUsingAvroSchemaParser` and add simple 
unit tests about that method will reduce the number of combinations we need to 
completely cover this change.
   
   




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