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https://issues.apache.org/jira/browse/KAFKA-4750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16063956#comment-16063956
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Matthias J. Sax commented on KAFKA-4750:
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I think [~damianguy] or [~enothereska] can comment best in this. AFAIK, we use
{{put(key,null)}} with delete-semantics all over the place. Also for {{KTable}}
caches. As it align with changelog delete semantics I also think it does make
sense to keep it this way. I would rather educate user that plug in Serde to
not return {{null}} if input is not {{null}}. We can also add checks to all
{{Serde}} calls: (1) never call Serde for {{null}} as we know it must be
{{null}} anyway (2) if we call Serde with not-null, make sure it does not
return {{null}} -- otherwise throw exception.
> KeyValueIterator returns null values
> ------------------------------------
>
> Key: KAFKA-4750
> URL: https://issues.apache.org/jira/browse/KAFKA-4750
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.10.1.1, 0.11.0.0, 0.10.2.1
> Reporter: Michal Borowiecki
> Assignee: Evgeny Veretennikov
> Labels: newbie
> Attachments: DeleteTest.java
>
>
> The API for ReadOnlyKeyValueStore.range method promises the returned iterator
> will not return null values. However, after upgrading from 0.10.0.0 to
> 0.10.1.1 we found null values are returned causing NPEs on our side.
> I found this happens after removing entries from the store and I found
> resemblance to SAMZA-94 defect. The problem seems to be as it was there, when
> deleting entries and having a serializer that does not return null when null
> is passed in, the state store doesn't actually delete that key/value pair but
> the iterator will return null value for that key.
> When I modified our serilizer to return null when null is passed in, the
> problem went away. However, I believe this should be fixed in kafka streams,
> perhaps with a similar approach as SAMZA-94.
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