andrew4699 commented on code in PR #1159:
URL: https://github.com/apache/polaris/pull/1159#discussion_r1990078883


##########
service/common/src/main/java/org/apache/polaris/service/exception/IcebergExceptionMapper.java:
##########
@@ -165,12 +167,16 @@ public static Collection<String> getAccessDeniedHints() {
   }
 
   static int mapExceptionToResponseCode(RuntimeException rex) {
-    Optional<Throwable> cloudException =
-        Arrays.stream(ExceptionUtils.getThrowables(rex))
-            .filter(IcebergExceptionMapper::isCloudException)
-            .findAny();
-    if (cloudException.isPresent()) {
-      return mapCloudExceptionToResponseCode(cloudException.get());
+    for (Throwable t : ExceptionUtils.getThrowables(rex)) {
+      // Cloud exceptions can be wrapped by the Iceberg SDK
+      if (isCloudException(t)) {
+        return mapCloudExceptionToResponseCode(t);
+      }
+
+      // UnknownHostException isn't a RuntimeException so it's always wrapped
+      if (t instanceof UnknownHostException && 
t.getMessage().contains(AZURE_STORAGE_URL_SUFFIX)) {
+        return Status.NOT_FOUND.getStatusCode(); // Return a 404 to be 
consistent with S3/GCS
+      }

Review Comment:
   This is definitely a cloud exception but above I meant the 3 top level cloud 
exception types as in S3Exception, AzureException, StorageException.
   
   I did a bit of refactoring, lmk what you think.



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