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https://issues.apache.org/jira/browse/SPARK-11225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14966151#comment-14966151
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Apache Spark commented on SPARK-11225:
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User 'viper-kun' has created a pull request for this issue:
https://github.com/apache/spark/pull/9191
> Prevent generate empty file
> ---------------------------
>
> Key: SPARK-11225
> URL: https://issues.apache.org/jira/browse/SPARK-11225
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: xukun
> Priority: Minor
>
> If no data will be written into the bucket, it will be generate empty files.
> So open() must be called in the first write(key,value).
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