ajothomas commented on a change in pull request #1560:
URL: https://github.com/apache/samza/pull/1560#discussion_r761578873



##########
File path: 
samza-core/src/main/java/org/apache/samza/table/batching/CompactBatch.java
##########
@@ -68,8 +71,10 @@ public int size() {
 
     if (operation instanceof GetOperation) {
       queries.putIfAbsent(operation.getKey(), operation);
+    } else if (operation instanceof UpdateOperation) {
+      throw new BatchingNotSupportedException("Batching not supported for 
Updates with CompactBatches");

Review comment:
       This exception is typically caught in the `updateAsync` method  of 
`AsyncBatchingTable` when batching fails. The code would just delegate it to 
standard `updateAsync` method upon such an exception.
   ```
    try {
         return batchProcessor.processPutDeleteOrUpdateOperations(new 
UpdateOperation<>(key, update, args));
       } catch (BatchingNotSupportedException e) {
         return table.updateAsync(key, update, args);
       } catch (Exception e) {
         throw new SamzaException(e);
       }
   ```




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