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https://issues.apache.org/jira/browse/BEAM-2393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16397890#comment-16397890
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Aljoscha Krettek commented on BEAM-2393:
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Have you enabled DEBUG logging in Flink? What do the logs say about the 
checkpointing times on the individual operators?

> BoundedSource is not fault-tolerant in FlinkRunner Streaming mode
> -----------------------------------------------------------------
>
>                 Key: BEAM-2393
>                 URL: https://issues.apache.org/jira/browse/BEAM-2393
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-flink
>            Reporter: Jingsong Lee
>            Assignee: Grzegorz KoĊ‚akowski
>            Priority: Major
>
> {{BoundedSourceWrapper}} does not implement snapshot() and restore(), when 
> the failure to restart, it will send duplicate data.



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