[jira] [Commented] (BEAM-2393) BoundedSource is not fault-tolerant in FlinkRunner Streaming mode

["Jingsong Lee (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-2393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16065750#comment-16065750 ] 

Jingsong Lee commented on BEAM-2393:
------------------------------------

Now the {{UnboundedSourceWrapper}} has already supported the exit when the watermark exceeds TIMESTAMP_MAX_VALUE. 
So can we use {{BoundedToUnboundedSourceAdapter}}?

bq. Checkpoints are created by calling {{BoundedReader#splitAtFraction}} on inner {{BoundedSource}}.
bq. Sources that cannot be split are read entirely into memory, so this transform does not work well with large, unsplittable sources.

But at least we can provide an accurate semantics.

> 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
>
> {{BoundedSourceWrapper}} does not implement snapshot() and restore(), when the failure to restart, it will send duplicate data.



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