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https://issues.apache.org/jira/browse/HADOOP-3177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12601783#action_12601783
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dhruba borthakur commented on HADOOP-3177:
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I am saying the same thing as you: let's add a new method 
FSDataOutputStream.fsync().

> Expose DFSOutputStream.fsync API though the FileSystem interface
> ----------------------------------------------------------------
>
>                 Key: HADOOP-3177
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3177
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>
> In the current code, there is a DFSOutputStream.fsync() API that allows a 
> client to flush all buffered data to the datanodes and also persist block 
> locations on the namenode. This API should be exposed through the generic API 
> in the org.hadoop.fs.

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