congye created KAFKA-19536:
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Summary: KStream-KStream leftJoin didn't consider gracePeriod for
out-of-order records
Key: KAFKA-19536
URL: https://issues.apache.org/jira/browse/KAFKA-19536
Project: Kafka
Issue Type: Bug
Components: streams
Affects Versions: 4.0.0, 3.9.2
Reporter: congye
Actual: in KStreamKStreamJoin.java, there's code snippet:
{code:java}
// This condition below allows us to process the out-of-order records without
the need
// to hold it in the temporary outer store
if (outerJoinStore.isEmpty() || timeTo < sharedTimeTracker.streamTime) {
context().forward(record.withValue(joiner.apply(record.key(),
record.value(), null)));
} {code}
So for out-of-order records, when the window closed, it may forward the
leftJoin result without waiting for extra gracePeriod.
Expect:
{code:java}
if (outerJoinStore.isEmpty() || timeTo + joinGraceMs <
sharedTimeTracker.streamTime) {
context().forward(record.withValue(joiner.apply(record.key(), record.value(),
null))); } {code}
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