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https://issues.apache.org/jira/browse/HADOOP-4508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12646701#action_12646701
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Tsz Wo (Nicholas), SZE commented on HADOOP-4508:
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How about make initialFileSize final and then getInitialLen() don't need to be 
synchronized?

> FSDataOutputStream.getPos() == 0when appending to existing file and should be 
> file length
> -----------------------------------------------------------------------------------------
>
>                 Key: HADOOP-4508
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4508
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.19.0, 0.20.0
>            Reporter: Pete Wyckoff
>            Assignee: dhruba borthakur
>         Attachments: appendGetPos.patch, appendGetPos2.patch, HADOOP-4508.txt
>
>
> does not seem getPos is set correctly when opening an existing file with 
> non-zero length in append mode.

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