mosche commented on code in PR #24837:
URL: https://github.com/apache/beam/pull/24837#discussion_r1062775812


##########
runners/spark/src/main/java/org/apache/beam/runners/spark/translation/MultiDoFnFunction.java:
##########
@@ -180,14 +186,14 @@ public TimerInternals timerInternals() {
     DoFnRunnerWithMetrics<InputT, OutputT> doFnRunnerWithMetrics =
         new DoFnRunnerWithMetrics<>(stepName, doFnRunner, metricsAccum);
 
-    return new SparkProcessContext<>(
+    SparkProcessContext<Object, InputT, OutputT> ctx =
+        new SparkProcessContext<>(

Review Comment:
   >  because processor is responsible for providing correct instance of output 
manager which is needed doFnRunner construction
   
   That's more or less what I meant, you can but everything into the 
constructor of the processor except the runner itself. E.g. process could look 
like this then:
   ```
   processor.process(iter, doFnRunnerWithMetrics)
   ```
   or even as below if you pass the input iterator into the constructor as well.
   ```
   processor.process(doFnRunnerWithMetrics)
   ```



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