izzyacademy commented on a change in pull request #10740:
URL: https://github.com/apache/kafka/pull/10740#discussion_r637013927



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/kstream/SessionWindows.java
##########
@@ -84,17 +86,14 @@ private SessionWindows(final long gapMs, final long 
graceMs) {
      * Create a new window specification with the specified inactivity gap.
      *
      * @param inactivityGap the gap of inactivity between sessions
-     * @return a new window specification with default maintain duration of 1 
day
+     * @return a new window specification with default without any grace period

Review comment:
       > I might have forgotten to specify this in the KIP, but we should make 
sure not to change the behavior of these old deprecated constructors. Maybe we 
can phrase this as something like:
   
   Hi @ableegoldman I may have misunderstood the KIP but I thought that we were 
changing org.apache.kafka.streams.kstream.Windows.DEFAULT_GRACE_PERIOD_MS from 
24 hours (in milliseconds) to 0 milliseconds. That was what I did. Based on 
your feedback, it seems I misread the KIP and have the wrong implementation. 
   
   So, should we still leave the 
org.apache.kafka.streams.kstream.Windows.DEFAULT_GRACE_PERIOD_MS constant as 
(24 * 60 * 60 * 1000L) milliseconds and only set the grace period of zero 
milliseconds in the new static constructors?




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