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https://issues.apache.org/jira/browse/KAFKA-9356?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sophie Blee-Goldman resolved KAFKA-9356.
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Resolution: Not A Problem
> Potential data loss in InMemoryWindowStore and InMemorySessionStore
> -------------------------------------------------------------------
>
> Key: KAFKA-9356
> URL: https://issues.apache.org/jira/browse/KAFKA-9356
> Project: Kafka
> Issue Type: Bug
> Reporter: Roman Leventov
> Priority: Major
>
> {{InMemoryWindowStore.put()}} and {{InMemorySessionStore.put()}} call
> {{computeIfAbsent()}} method on {{ConcurrentSkipListMap}} objects which opens
> up possibility for data loss because
> {{ConcurrentSkipListMap.computeIfAbsent()}} is not an atomic operation.
> Possible fix: replace {{ConcurrentSkipListMaps with synchronized[Sorted,
> Navigable]Map(new TreeMap<>())}}.
>
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