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https://issues.apache.org/jira/browse/FLINK-1763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14372961#comment-14372961
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Stephan Ewen commented on FLINK-1763:
-------------------------------------
The Batch API calles the {{close()}} function also in the cancelling case. This
makes many implementations easy. Cancelling is to the sing function just like
closing (early).
> Remove "cancel" from streaming SinkFunction
> -------------------------------------------
>
> Key: FLINK-1763
> URL: https://issues.apache.org/jira/browse/FLINK-1763
> Project: Flink
> Issue Type: Improvement
> Components: Streaming
> Affects Versions: 0.9
> Reporter: Stephan Ewen
> Fix For: 0.9
>
>
> Since the streaming sink function is called individually for each record, it
> does not require a {{cancel()}} function. The system can cancel between calls
> to that function (which it cannot do for the source function).
> Removing this method removes the need to always implement the unnecessary,
> and usually empty, method.
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