guozhangwang commented on a change in pull request #11252:
URL: https://github.com/apache/kafka/pull/11252#discussion_r711197318
##########
File path:
streams/src/main/java/org/apache/kafka/streams/kstream/internals/KStreamKStreamJoin.java
##########
@@ -209,37 +211,51 @@ private void emitNonJoinedOuterRecords(final
WindowStore<KeyAndJoinSide<K>, Left
// reset to MAX_VALUE in case the store is empty
sharedTimeTracker.minTime = Long.MAX_VALUE;
- try (final KeyValueIterator<Windowed<KeyAndJoinSide<K>>,
LeftOrRightValue> it = store.all()) {
+ try (final KeyValueIterator<TimestampedKeyAndJoinSide<K>,
LeftOrRightValue<V1, V2>> it = store.all()) {
+ TimestampedKeyAndJoinSide<K> prevKey = null;
+
while (it.hasNext()) {
- final KeyValue<Windowed<KeyAndJoinSide<K>>,
LeftOrRightValue> record = it.next();
+ final KeyValue<TimestampedKeyAndJoinSide<K>,
LeftOrRightValue<V1, V2>> record = it.next();
- final Windowed<KeyAndJoinSide<K>> windowedKey = record.key;
- final LeftOrRightValue value = record.value;
- sharedTimeTracker.minTime = windowedKey.window().start();
+ final TimestampedKeyAndJoinSide<K>
timestampedKeyAndJoinSide = record.key;
+ final LeftOrRightValue<V1, V2> value = record.value;
+ final K key = timestampedKeyAndJoinSide.getKey();
+ final long timestamp =
timestampedKeyAndJoinSide.getTimestamp();
+ sharedTimeTracker.minTime = timestamp;
// Skip next records if window has not closed
- if (windowedKey.window().start() + joinAfterMs +
joinGraceMs >= sharedTimeTracker.streamTime) {
+ if (timestamp + joinAfterMs + joinGraceMs >=
sharedTimeTracker.streamTime) {
break;
}
- final K key = windowedKey.key().getKey();
- final long time = windowedKey.window().start();
-
final R nullJoinedValue;
if (isLeftSide) {
nullJoinedValue = joiner.apply(key,
- (V1) value.getLeftValue(),
- (V2) value.getRightValue());
+ value.getLeftValue(),
+ value.getRightValue());
} else {
nullJoinedValue = joiner.apply(key,
- (V1) value.getRightValue(),
- (V2) value.getLeftValue());
+ (V1) value.getRightValue(),
+ (V2) value.getLeftValue());
}
- context().forward(key, nullJoinedValue,
To.all().withTimestamp(time));
+ context().forward(key, nullJoinedValue,
To.all().withTimestamp(timestamp));
+
+ if (prevKey != null &&
!prevKey.equals(timestampedKeyAndJoinSide)) {
Review comment:
The argument is that if `prevKey == null`, then we do not want to
trigger, but `!timestampedKeyAndJoinSide.equals(prevKey)` would pass and hence
cause a trigger.
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