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Posted to issues@flink.apache.org by "Robert Metzger (JIRA)" <ji...@apache.org> on 2016/06/15 20:26:09 UTC
[jira] [Assigned] (FLINK-4027) FlinkKafkaProducer09 sink can lose
messages
[ https://issues.apache.org/jira/browse/FLINK-4027?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Robert Metzger reassigned FLINK-4027:
-------------------------------------
Assignee: Robert Metzger
> FlinkKafkaProducer09 sink can lose messages
> -------------------------------------------
>
> Key: FLINK-4027
> URL: https://issues.apache.org/jira/browse/FLINK-4027
> Project: Flink
> Issue Type: Bug
> Components: Kafka Connector
> Affects Versions: 1.0.3
> Reporter: Elias Levy
> Assignee: Robert Metzger
> Priority: Critical
>
> The FlinkKafkaProducer09 sink appears to not offer at-least-once guarantees.
> The producer is publishing messages asynchronously. A callback can record publishing errors, which will be raised when detected. But as far as I can tell, there is no barrier to wait for async errors from the sink when checkpointing or to track the event time of acked messages to inform the checkpointing process.
> If a checkpoint occurs while there are pending publish requests, and the requests return a failure after the checkpoint occurred, those message will be lost as the checkpoint will consider them processed by the sink.
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