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https://issues.apache.org/jira/browse/BEAM-6751?focusedWorklogId=206401&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-206401
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ASF GitHub Bot logged work on BEAM-6751:
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Author: ASF GitHub Bot
Created on: 01/Mar/19 11:53
Start Date: 01/Mar/19 11:53
Worklog Time Spent: 10m
Work Description: mxm commented on issue #7955: [BEAM-6751] Extend Kafka
EOS mode whitelist / Warn instead of throw
URL: https://github.com/apache/beam/pull/7955#issuecomment-468641037
>@mxm, warning implies that the transform would run, but not provide EOS
guarantees on Flink, right? Is that ok? IOW, EOS is ignored?
Yes, we cannot guarantee EOS with the current architecture. I'm not too fond
of this transform check but it does reflect the situation accurately. I think
it would be better to check whether the Runner handles `RequiresStableInput`
instead.
We have started discussing this on the mailing:
https://lists.apache.org/thread.html/d0c24cb4d421e25980fee1855d1daa68d343700270ed962d642c8f99@%3Cdev.beam.apache.org%3E
I'll leave the check in place until we find a solution. Closing the PR for
now.
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Issue Time Tracking
-------------------
Worklog Id: (was: 206401)
Time Spent: 1h 40m (was: 1.5h)
> KafkaIO blocks FlinkRunner in EOS mode
> --------------------------------------
>
> 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: Critical
> Fix For: 2.12.0
>
> Time Spent: 1h 40m
> 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 FlinkRunner supports exactly-once checkpointing but is blocked from using
> Kafka's exactly once mode.
> I wonder if such a list is easily maintainable? I think we should replace the
> list with a warning instead.
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