[jira] [Created] (KAFKA-9524) Default window retention does not consider grace period

["Michael Bingham (Jira)" <ji...@apache.org>]

Michael Bingham created KAFKA-9524:
--------------------------------------

             Summary: Default window retention does not consider grace period
                 Key: KAFKA-9524
                 URL: https://issues.apache.org/jira/browse/KAFKA-9524
             Project: Kafka
          Issue Type: Bug
          Components: streams
    Affects Versions: 2.4.0
            Reporter: Michael Bingham


In a windowed aggregation, if you specify a window size larger than the default window retention (1 day), Streams will implicitly set retention accordingly to accommodate windows of that size. For example,

 
{code:java}
.windowedBy(TimeWindows.of(Duration.ofDays(20))) 
{code}
In this case, Streams will implicitly set window retention to 20 days, and no exceptions will occur.

However, if you also include a non-zero grace period on the window, such as:

 
{code:java}
.windowedBy(TimeWindows.of(Duration.ofDays(20)).grace(Duration.ofMinutes(5)))
{code}
In this case, Streams will still implicitly set the window retention 20 days (not 20 days + 5 minutes grace), and an exception will be thrown:
Exception in thread "main" java.lang.IllegalArgumentException: The retention period of the window store KSTREAM-KEY-SELECT-0000000002 must be no smaller than its window size plus the grace period. Got size=[1728000000], grace=[300000], retention=[1728000000]
Ideally, Streams should include grace period when implicitly setting window retention.



--
This message was sent by Atlassian Jira
(v8.3.4#803005)