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https://issues.apache.org/jira/browse/HDFS-989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13144987#comment-13144987
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Uma Maheswara Rao G commented on HDFS-989:
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flush and sync are mainly for DFS. not for local file-systems.
Currently you can invoke them on dfs streams.
so, closing this as invalid. If the issue intention is different, please feel
free to reopen it.
> Flush/sync do not work on Hadoop LocalFileSystem
> ------------------------------------------------
>
> Key: HDFS-989
> URL: https://issues.apache.org/jira/browse/HDFS-989
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 0.20.1
> Reporter: Nathan Marz
>
> They seem to be no-ops. This is really easy to reproduce, just open a file
> using FileSystem/getLocal(new Configuration()), write data to the output
> stream, and then try to flush/sync. I also tried creating the output stream
> with a buffer size of 1, but that had no effect.
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