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Posted to issues@beam.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2019/03/05 18:43:00 UTC
[jira] [Work logged] (BEAM-6751) KafkaIO's EOS mode does not work
with FlinkRunner
[ https://issues.apache.org/jira/browse/BEAM-6751?focusedWorklogId=207967&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-207967 ]
ASF GitHub Bot logged work on BEAM-6751:
----------------------------------------
Author: ASF GitHub Bot
Created on: 05/Mar/19 18:42
Start Date: 05/Mar/19 18:42
Worklog Time Spent: 10m
Work Description: mxm commented on pull request #7991: [BEAM-6751] Add KafkaIO EOS support to Flink via @RequiresStableInput
URL: https://github.com/apache/beam/pull/7991
This enables exactly-once support for the KafkaIO sink when using the Flink
Runner. KafkaIO's KafkaExactlyOnceSink has been annotated with
@RequiresStableInput which forces the Flink Runner to buffer pending elements
until a checkpoint is completed.
Post-Commit Tests Status (on master branch)
------------------------------------------------------------------------------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 207967)
Time Spent: 2h (was: 1h 50m)
> 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: 2h
> 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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