[jira] [Closed] (BEAM-6751) KafkaIO's EOS mode does not work with FlinkRunner

["Maximilian Michels (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-6751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Maximilian Michels closed BEAM-6751.
------------------------------------
    Resolution: Fixed

> KafkaIO's EOS mode does not work with FlinkRunner
> -------------------------------------------------
>
>                 Key: BEAM-6751
>                 URL: https://issues.apache.org/jira/browse/BEAM-6751
>             Project: Beam
>          Issue Type: Bug
>          Components: io-java-kafka, runner-flink
>            Reporter: Maximilian Michels
>            Assignee: Maximilian Michels
>            Priority: Major
>             Fix For: 2.12.0
>
>          Time Spent: 10h 20m
>  Remaining Estimate: 0h
>
> KafkaIO has a validation check which whitelists certain runners capable of provide exactly-once semantics:
> {noformat}
>         if ("org.apache.beam.runners.direct.DirectRunner".equals(runner)
>             || runner.startsWith("org.apache.beam.runners.dataflow.")
>             || runner.startsWith("org.apache.beam.runners.spark.") {
> ...
> {noformat}
> The Flink supports exactly-once checkpointing but the Flink Runner can't utilize it in the way KafkaIO intends it.
> I think we should remove the check in favor of checking for translation of {{@RequiresStableInput}}. Changes to KafkaIO might have to be made to support EOS efficiently with the Flink Runner.



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