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https://issues.apache.org/jira/browse/KAFKA-8315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16831735#comment-16831735
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Andrew commented on KAFKA-8315:
-------------------------------
Ok, thanks.
However, I thought retention period was meant to be independent of grace
period, like it is for grouped aggregations? I can see from the code though
that the retention is explicitly set to the grace period.
\{Code}
@SuppressWarnings("deprecation") // continuing to support
Windows#maintainMs/segmentInterval in fallback mode
private static <K, V> StoreBuilder<WindowStore<K, V>>
joinWindowStoreBuilder(final String joinName,
final JoinWindows windows,
final Serde<K> keySerde,
final Serde<V> valueSerde) {
return Stores.windowStoreBuilder(
Stores.persistentWindowStore(
joinName + "-store",
Duration.ofMillis(windows.size() + windows.gracePeriodMs()),
<------------------------
Duration.ofMillis(windows.size()),
true
),
keySerde,
valueSerde
);
}
{Code}
Andy Smith [1 minute ago]
so it looks like the grace period defines the retention period...
> Cannot pass Materialized into a join operation
> ----------------------------------------------
>
> Key: KAFKA-8315
> URL: https://issues.apache.org/jira/browse/KAFKA-8315
> Project: Kafka
> Issue Type: Bug
> Reporter: Andrew
> Assignee: John Roesler
> Priority: Major
>
> The documentation says to use `Materialized` not `JoinWindows.until()`
> (https://kafka.apache.org/22/javadoc/org/apache/kafka/streams/kstream/JoinWindows.html#until-long-),
> but there is no where to pass a `Materialized` instance to the join
> operation, only to the group operation is supported it seems.
>
> Slack conversation here :
> https://confluentcommunity.slack.com/archives/C48AHTCUQ/p1556799561287300
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