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https://issues.apache.org/jira/browse/KAFKA-9405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ismael Juma resolved KAFKA-9405.
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Fix Version/s: 2.5.0
Resolution: Fixed
> Use Map API computeIfAbsent Where Applicable
> --------------------------------------------
>
> Key: KAFKA-9405
> URL: https://issues.apache.org/jira/browse/KAFKA-9405
> Project: Kafka
> Issue Type: Improvement
> Components: clients
> Reporter: David Mollitor
> Priority: Minor
> Fix For: 2.5.0
>
>
> {quote}
> to implement a multi-value map, Map<K,Collection<V>>, supporting multiple
> values per key:
>
> map.computeIfAbsent(key, k -> new HashSet<V>()).add(v);
> {quote}
> https://docs.oracle.com/javase/8/docs/api/java/util/Map.html#computeIfAbsent-K-java.util.function.Function-
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