[jira] [Resolved] (FLINK-5701) FlinkKafkaProducer should check asyncException on checkpoints

["Tzu-Li (Gordon) Tai (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-5701?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tzu-Li (Gordon) Tai resolved FLINK-5701.
----------------------------------------
       Resolution: Fixed
         Assignee: Tzu-Li (Gordon) Tai
    Fix Version/s: 1.2.1
                   1.3.0

Resolved for {{master}} via http://git-wip-us.apache.org/repos/asf/flink/commit/646490c
Resolved for {{release-1.2}} via http://git-wip-us.apache.org/repos/asf/flink/commit/576cc89

> FlinkKafkaProducer should check asyncException on checkpoints
> -------------------------------------------------------------
>
>                 Key: FLINK-5701
>                 URL: https://issues.apache.org/jira/browse/FLINK-5701
>             Project: Flink
>          Issue Type: Bug
>          Components: Kafka Connector, Streaming Connectors
>            Reporter: Tzu-Li (Gordon) Tai
>            Assignee: Tzu-Li (Gordon) Tai
>            Priority: Critical
>             Fix For: 1.3.0, 1.2.1
>
>
> Reported in ML: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Fink-KafkaProducer-Data-Loss-td11413.html
> The problem:
> The producer holds a {{pendingRecords}} value that is incremented on each invoke() and decremented on each callback, used to check if the producer needs to sync on pending callbacks on checkpoints.
> On each checkpoint, we should only consider the checkpoint succeeded iff after flushing the {{pendingRecords == 0}} and {{asyncException == null}} (currently, we’re only checking {{pendingRecords}}).
> A quick fix for this is to check and rethrow async exceptions in the {{snapshotState}} method both before and after flushing and {{pendingRecords}} becomes 0.



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