scwhittle commented on code in PR #38863:
URL: https://github.com/apache/beam/pull/38863#discussion_r3413894185


##########
sdks/java/core/src/main/java/org/apache/beam/sdk/fn/data/BeamFnDataOutboundAggregator.java:
##########
@@ -53,10 +55,7 @@
  * <p>The default time-based buffer threshold can be overridden by specifying 
the experiment {@code
  * data_buffer_time_limit_ms=<milliseconds>}
  */
-@SuppressWarnings({
-  "nullness" // TODO(https://github.com/apache/beam/issues/20497)
-})
-// The calling thread that invokes sendBufferedDataAndFinishOutboundStreams 
synchronizes on
+// The calling thread that invokes 
sendOrCollectBufferedDataAndFinishOutboundStreams synchronizes on

Review Comment:
   the locking in this class is complicated, the synchronization is just needed 
if there is the background flush future.  With a single implementation the 
duplicated code is at least co-located but we could possibly restructure to two 
separate implementations to simplify the non-background flushing implementation.



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