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Date: Wed, 15 Jun 2016 20:26:09 +0000 (UTC)
From: "Robert Metzger (JIRA)" <jira@apache.org>
To: issues@flink.apache.org
Message-ID: <JIRA.12976202.1465247255000.10095.1466022369374@Atlassian.JIRA>
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Subject: [jira] [Assigned] (FLINK-4027) FlinkKafkaProducer09 sink can lose
 messages
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archived-at: Wed, 15 Jun 2016 20:26:11 -0000


     [ 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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