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https://issues.apache.org/jira/browse/FLINK-3296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15148652#comment-15148652
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ASF GitHub Bot commented on FLINK-3296:
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Github user rmetzger commented on the pull request:
https://github.com/apache/flink/pull/1563#issuecomment-184700077
I'll merge the PR.
> DataStream.write*() methods are not flushing properly
> -----------------------------------------------------
>
> Key: FLINK-3296
> URL: https://issues.apache.org/jira/browse/FLINK-3296
> Project: Flink
> Issue Type: Bug
> Components: Streaming Connectors
> Reporter: Robert Metzger
> Assignee: Robert Metzger
> Priority: Critical
>
> The DataStream.write() methods rely on the {{FileSinkFunctionByMillis}}
> class, which has a logic for flushing records, even though the underlying
> stream is never flushed. This is misleading for users as files are not
> written as they would expect it.
> The code was initial written with FileOutputFormats in mind, but the types
> were not set correctly. This PR opened the write() method to any output
> format: https://github.com/apache/flink/pull/706/files
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