lostluck commented on code in PR #33493:
URL: https://github.com/apache/beam/pull/33493#discussion_r1904498004


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sdks/go/pkg/beam/runners/prism/internal/engine/teststream.go:
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@@ -142,10 +142,8 @@ func (ts *testStreamHandler) UpdateHold(em 
*ElementManager, newHold mtime.Time)
        ts.currentHold = newHold
        ss.watermarkHolds.Add(ts.currentHold, 1)
 
-       // kick the TestStream and Impulse stages too.
+       // kick the TestStream stage to ensure downstream watermark propagation.

Review Comment:
   Before I answer, what do you think it means?



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