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https://issues.apache.org/jira/browse/IO-386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16075820#comment-16075820
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Bernd Eckenfels commented on IO-386:
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After discussion in IO-544 I also wonder if the transferFrom returning 0 case
does not need a few retries to avoid the length difference exception
> FileUtils.doCopyFile uses different methods to check the file sizes
> -------------------------------------------------------------------
>
> Key: IO-386
> URL: https://issues.apache.org/jira/browse/IO-386
> Project: Commons IO
> Issue Type: Bug
> Reporter: Sebb
> Priority: Minor
>
> FileUtils.doCopyFile uses FileChannel.size() to measure the input file length
> at the start, and File.length() to compare the lengths at the end.
> This is inconsistent.
> If there is a good reason for this it should be documented, otherwise it
> should probably use the same method for all the checks.
> [Note: is FileChannel.size() accurate if the file has not been flushed?]
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