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https://issues.apache.org/jira/browse/FLINK-9115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16423131#comment-16423131
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Lakshmi Rao commented on FLINK-9115:
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I see a similar ask on this thread here earlier this year: 
https://stackoverflow.com/questions/48204520/how-to-add-suffix-to-final-completed-file-generated-by-bucketingsink-in-apache-f?rq=1

> Support addition of part suffix in BucketingSink
> ------------------------------------------------
>
>                 Key: FLINK-9115
>                 URL: https://issues.apache.org/jira/browse/FLINK-9115
>             Project: Flink
>          Issue Type: Improvement
>          Components: filesystem-connector
>            Reporter: Lakshmi Rao
>            Priority: Minor
>              Labels: usability
>
> Currently the BucketingSink allows addition of part prefix, pending 
> prefix/suffix and in-progress prefix/suffix via setter methods. Can we also 
> support setting part suffixes?
> An instance where this maybe useful: I am currently writing GZIP compressed 
> output to S3 using the BucketingSink and I would want the uploaded files to 
> have a ".gz" or ".zip" extensions . An easy way to do this would be by 
> setting  a part file suffix with the required file extension. 



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