kennknowles commented on code in PR #27702:
URL: https://github.com/apache/beam/pull/27702#discussion_r1277730535


##########
sdks/java/io/kafka/src/main/java/org/apache/beam/sdk/io/kafka/ReadFromKafkaDoFn.java:
##########
@@ -311,17 +324,26 @@ public OffsetRangeTracker restrictionTracker(
     if (restriction.getTo() < Long.MAX_VALUE) {
       return new OffsetRangeTracker(restriction);
     }
-    Map<String, Object> updatedConsumerConfig =
-        overrideBootstrapServersConfig(consumerConfig, kafkaSourceDescriptor);
-    KafkaLatestOffsetEstimator offsetPoller =
-        new KafkaLatestOffsetEstimator(
-            consumerFactoryFn.apply(

Review Comment:
   We saw ~5 rather than ~1 didn't we? I'm in too many chats on this :-). At 
heart, I just don't like the code approach of counting on memoizing a result 
value as the way we avoid creating a connection, and I prefer having the 
automatic creation take place at a higher level in the call stack, ideally at 
the DoFn level. I see that SDF and UnboundedSource have the difference that the 
topic partition is statically determined vs incoming elements. TBH I'd not 
expect a major architectural difference. To be continued!



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