mjsax commented on code in PR #17054:
URL: https://github.com/apache/kafka/pull/17054#discussion_r1741186976
##########
streams/src/main/java/org/apache/kafka/streams/errors/ErrorHandlerContext.java:
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@@ -102,4 +106,23 @@ public interface ErrorHandlerContext {
* @return the task ID
*/
TaskId taskId();
+
+ /**
+ * Return the current timestamp.
+ *
+ * <p> If it is triggered while processing a record streamed from the
source processor,
+ * timestamp is defined as the timestamp of the current input record; the
timestamp is extracted from
+ * {@link org.apache.kafka.clients.consumer.ConsumerRecord ConsumerRecord}
by {@link TimestampExtractor}.
+ * Note, that an upstream {@link
org.apache.kafka.streams.processor.api.Processor} might have set a new
timestamp by calling
+ * {@link ProcessorContext#forward(Object, Object, To) forward(...,
To.all().withTimestamp(...))}.
+ * In particular, some Kafka Streams DSL operators set result record
timestamps explicitly,
+ * to guarantee deterministic results.
+ *
+ * <p> If it is triggered while processing a record generated not from the
source processor (for example,
+ * if this method is invoked from the punctuate call), timestamp is
defined as the current
+ * task's stream time, which is defined as the largest timestamp of any
record processed by the task.
Review Comment:
I did some more digging... Seems, we actually need to distinguish between
`stream time` vs `wall-clock time` punctuations.
For `stream time` punctuation, we set "stream time" as "record context
timestamp" and thus `context.timestamp()` will return "stream time". For
`wall-clock time` punctuations, we set "system time" as "record context
timestamp" and thus `context.timestamp()` will return "system time".
Did I get this correctly?
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