vvcephei commented on a change in pull request #10731:
URL: https://github.com/apache/kafka/pull/10731#discussion_r645017943
##########
File path:
streams/src/main/java/org/apache/kafka/streams/kstream/internals/KTableTransformValues.java
##########
@@ -158,7 +158,11 @@ public void init(final ProcessorContext context) {
internalProcessorContext.setRecordContext(new
ProcessorRecordContext(
valueAndTimestamp == null ? UNKNOWN :
valueAndTimestamp.timestamp(),
-1L, // we don't know the original offset
- currentContext.partition(),
+ // technically, we know the partition, but in the new
`api.Processor` class,
+ // we move to `RecordMetadata` than would be `null` for this
case and thus
+ // we won't have the partition information, so it's better to
now provide it
+ // here either, to not introduce a regression later on
+ -1,
Review comment:
Good point, @mjsax .
##########
File path:
streams/src/main/java/org/apache/kafka/streams/kstream/ValueTransformerWithKey.java
##########
@@ -75,14 +75,21 @@
void init(final ProcessorContext context);
/**
- * Transform the given [key and ]value to a new value.
+ * Transform the given [key and] value to a new value.
* Additionally, any {@link StateStore} that is {@link
KStream#transformValues(ValueTransformerWithKeySupplier, String...)
* attached} to this operator can be accessed and modified arbitrarily (cf.
* {@link ProcessorContext#getStateStore(String)}).
* <p>
- * Note, that using {@link ProcessorContext#forward(Object, Object)} or
+ * Note that using {@link ProcessorContext#forward(Object, Object)} or
* {@link ProcessorContext#forward(Object, Object, To)} is not allowed
within {@code transform} and
* will result in an {@link StreamsException exception}.
+ * <p>
+ * Note that if a {@code ValueTransformerWithKey} is used in a {@link
KTable#transformValues(ValueTransformerWithKeySupplier, String...)}
+ * (or any other overload of {@code KTable#transformValues(...)})
operation,
+ * then the provided {@link ProcessorContext} from {@link
#init(ProcessorContext)}
+ * does not guarantee that all context information will be available when
{@code transform()}
+ * is executed, as it might be executed "out-of-band" due to some internal
optimizations
+ * applied by the Kafka Streams DSL.
Review comment:
Thanks!
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