lhotari commented on code in PR #24103:
URL: https://github.com/apache/pulsar/pull/24103#discussion_r2006980324


##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/impl/SchemasResourceBase.java:
##########
@@ -123,8 +125,28 @@ public CompletableFuture<SchemaVersion> 
deleteSchemaAsync(boolean authoritative,
                 });
     }
 
+    protected CompletableFuture<Void> 
checkSchemaTypeSupported(PostSchemaPayload payload) {
+        switch (SchemaType.valueOf(payload.getType())) {
+            case AVRO : {
+                Schema schema = 
SchemaUtil.parseAvroSchema(payload.getSchema());
+                try {
+                    // Pulsar only support "RecordSchema" so far. Other types 
will throw an error when calls
+                    // "getFields".
+                    // Since "RecordSchema" is an avro internal private class, 
we can not use "instanceof" here.
+                    schema.getFields();
+                } catch (Exception e) {
+                    return CompletableFuture.failedFuture(new 
RestException(Response.Status.BAD_REQUEST.getStatusCode(),
+                          "[" + String.valueOf(topicName) + "] Avro schema 
typed [" + schema.getType() + "]"
+                          + " is not supported"));
+                }

Review Comment:
   There's also a public `org.apache.avro.Schema#isUnion` method if that's the 
only case to check. 



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