vvcephei commented on a change in pull request #11406:
URL: https://github.com/apache/kafka/pull/11406#discussion_r734706119



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/processor/StateStoreContext.java
##########
@@ -42,6 +47,27 @@
      */
     TaskId taskId();
 
+    /**
+     * Return the metadata of the current record if available. Processors may 
be invoked to
+     * process a source record from an input topic, to run a scheduled 
punctuation

Review comment:
       I'm not sure where the best docs for punctuation are, but here's at 
least some docs: 
http://kafka.apache.org/30/javadoc/org/apache/kafka/streams/processor/ProcessorContext.html#schedule(java.time.Duration,org.apache.kafka.streams.processor.PunctuationType,org.apache.kafka.streams.processor.Punctuator)
   
   Basically, processors can schedule a periodic callback with a timer.




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