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https://issues.apache.org/jira/browse/BEAM-1723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15962077#comment-15962077
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Jingsong Lee commented on BEAM-1723:
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I understand. The reason for the duplication is that {{PubSubIO}} use Pull-Ack
model, {{acknowledge()}} in {{finalizeCheckpoint()}} may be fail, while Kafka
use offset to restore.
> FlinkRunner should deduplicate when an UnboundedSource requires Deduping
> ------------------------------------------------------------------------
>
> Key: BEAM-1723
> URL: https://issues.apache.org/jira/browse/BEAM-1723
> Project: Beam
> Issue Type: Bug
> Components: runner-flink
> Reporter: Thomas Groh
> Assignee: Jingsong Lee
>
> UnboundedSource implementations can require deduping, and the FlinkRunner
> currently logs a warning that this is not supported.
> https://github.com/apache/beam/blob/master/runners/flink/runner/src/main/java/org/apache/beam/runners/flink/translation/wrappers/streaming/io/UnboundedSourceWrapper.java#L139
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