Make writes to S3FileSystem world visible only on completion
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                 Key: HADOOP-931
                 URL: https://issues.apache.org/jira/browse/HADOOP-931
             Project: Hadoop
          Issue Type: Bug
          Components: fs
            Reporter: Tom White


Currently files written to S3 are visible to other processes as soon as the 
first block has been written. This is different to DFS which only makes files 
world visible after the stream writing to the file has closed (see 
FSNamesystem.completeFile).

We could implement this by having a piece of inode metadata that indicates the 
visibility of the file.

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