Michael Bingham created KAFKA-9524:
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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.
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