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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-4750) KeyValueIterator returns null values
Date Thu, 01 Feb 2018 20:45:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-4750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16349235#comment-16349235
] 

ASF GitHub Bot commented on KAFKA-4750:
---------------------------------------

guozhangwang opened a new pull request #4508: KAFKA-4750: Bypass null value and treat it as
deletes
URL: https://github.com/apache/kafka/pull/4508
 
 
   * If the value is null, bypass the serde and treat it as deletes in the inner-most underlying
store.
   * Update javadocs, add unit tests accordingly
   
   This is originally contributed by @evis.
   
   ### Committer Checklist (excluded from commit message)
   - [ ] Verify design and implementation 
   - [ ] Verify test coverage and CI build status
   - [ ] Verify documentation (including upgrade notes)
   

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> 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, 0.10.2.1, 0.11.0.0
>            Reporter: Michal Borowiecki
>            Assignee: Evgeny Veretennikov
>            Priority: Major
>              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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