xinyuiscool commented on a change in pull request #15280:
URL: https://github.com/apache/beam/pull/15280#discussion_r683860783



##########
File path: 
runners/samza/src/main/java/org/apache/beam/runners/samza/translation/ParDoBoundMultiTranslator.java
##########
@@ -112,8 +113,10 @@ public void translate(
             .collect(
                 Collectors.toMap(e -> e.getKey(), e -> ((PCollection<?>) 
e.getValue()).getCoder()));
 
-    boolean isStateful = DoFnSignatures.isStateful(transform.getFn());
-    final Coder<?> keyCoder = isStateful ? ((KvCoder<?, ?>) 
input.getCoder()).getKeyCoder() : null;
+    final Coder<?> keyCoder =
+        StateUtils.isStateful(transform.getFn())

Review comment:
       I guess we might as well add a getKeyCoder() in the stateUtils to avoid 
these logic.




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