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https://issues.apache.org/jira/browse/SPARK-1518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14010117#comment-14010117
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Patrick Wendell commented on SPARK-1518:
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Ah okay. I'm not sure what the oldest version Hadoop that spark Spark compiles 
against pre 0.21, but it's worth knowing whether this change would cause us to 
drop support for some of the older versions.

> Spark master doesn't compile against hadoop-common trunk
> --------------------------------------------------------
>
>                 Key: SPARK-1518
>                 URL: https://issues.apache.org/jira/browse/SPARK-1518
>             Project: Spark
>          Issue Type: Bug
>            Reporter: Marcelo Vanzin
>            Assignee: Colin Patrick McCabe
>
> FSDataOutputStream::sync() has disappeared from trunk in Hadoop; 
> FileLogger.scala is calling it.
> I've changed it locally to hsync() so I can compile the code, but haven't 
> checked yet whether those are equivalent. hsync() seems to have been there 
> forever, so it hopefully works with all versions Spark cares about.



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