mjsax commented on a change in pull request #10917: URL: https://github.com/apache/kafka/pull/10917#discussion_r660334734
########## File path: streams/src/main/java/org/apache/kafka/streams/kstream/internals/KStreamKStreamJoin.java ########## @@ -186,12 +190,17 @@ public void process(final K key, final V1 value) { @SuppressWarnings("unchecked") private void emitNonJoinedOuterRecords(final WindowStore<KeyAndJoinSide<K>, LeftOrRightValue> store) { + if (minTime.minTime >= maxObservedStreamTime.get() - joinAfterMs - joinBeforeMs - joinGraceMs) { Review comment: It's a performance question. Without `joinBeforeMs` we only get 3K rec/sec throughput in our benchmarks, while we get 12K rec/sec throughput with `joinBeforeMs`. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: jira-unsubscr...@kafka.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org