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https://issues.apache.org/jira/browse/FLINK-3188?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Metzger reassigned FLINK-3188:
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Assignee: Robert Metzger
> Deletes in Kafka source should be passed on to KeyedDeserializationSchema
> -------------------------------------------------------------------------
>
> Key: FLINK-3188
> URL: https://issues.apache.org/jira/browse/FLINK-3188
> Project: Flink
> Issue Type: Bug
> Components: Kafka Connector
> Affects Versions: 1.0.0
> Reporter: Sebastian Klemke
> Assignee: Robert Metzger
> Attachments: kafka-deletions.patch
>
>
> When keys are deleted in the kafka queue, they show up as keys with null
> payload. Currently in Flink 1.0-SNAPSHOT, these deletions are silently
> skipped, without increasing current offset.
> This leads to two problems:
> 1. When a fetch window contains only deletions, LegacyFetcher gets stuck
> 2. For KeyedDeserializationSchemas, it would make sense to pass deletions to
> the deserializer, so that it can decide to wrap deleted keys as a deletion
> command. This is also more consistent with the semantics of keys in Kafka
> queues: When compaction is activated, only the latest message with the same
> key needs to be kept by Kafka.
> We propose the attached patch as a workaround for both issues.
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