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https://issues.apache.org/jira/browse/BEAM-2939?focusedWorklogId=426368&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-426368
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ASF GitHub Bot logged work on BEAM-2939:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 23/Apr/20 05:16
            Start Date: 23/Apr/20 05:16
    Worklog Time Spent: 10m 
      Work Description: lukecwik commented on a change in pull request #11472:
URL: https://github.com/apache/beam/pull/11472#discussion_r413515258



##########
File path: 
sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/reflect/ByteBuddyDoFnInvokerFactory.java
##########
@@ -397,12 +396,14 @@ public WatermarkEstimatorStateT getState() {
   }
 
   public static class DefaultGetSize {
-    /** Uses {@link Sizes.HasSize} to produce the size. */
+    /** Uses {@link HasProgress} to produce the size. */
     @SuppressWarnings("unused")
     public static <InputT, OutputT> double invokeGetSize(
         DoFnInvoker.ArgumentProvider<InputT, OutputT> argumentProvider) {
-      if (argumentProvider.restrictionTracker() instanceof HasSize) {
-        return ((HasSize) argumentProvider.restrictionTracker()).getSize();
+      if (argumentProvider.restrictionTracker() instanceof HasProgress) {

Review comment:
       DoFn can provide a method annotated with `@GetSize` and the fallback is 
the HasProgress on the RestrictionTracker. This is analogous to 
RestrictionProvider/RProvider being able to provide the size while the 
RestrictionTracker/RTracker provide progress in Python/Go.




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 426368)
    Time Spent: 29.5h  (was: 29h 20m)

> Fn API SDF support
> ------------------
>
>                 Key: BEAM-2939
>                 URL: https://issues.apache.org/jira/browse/BEAM-2939
>             Project: Beam
>          Issue Type: Improvement
>          Components: beam-model
>            Reporter: Henning Rohde
>            Assignee: Luke Cwik
>            Priority: Major
>              Labels: portability
>          Time Spent: 29.5h
>  Remaining Estimate: 0h
>
> The Fn API should support streaming SDF. Detailed design TBD.
> Once design is ready, expand subtasks similarly to BEAM-2822.



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