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From "Stephen Kestle (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IO-271) FileUtils.copyDirectory should be able to handle arbitrary number of files
Date Thu, 05 May 2011 11:44:03 GMT
FileUtils.copyDirectory should be able to handle arbitrary number of files
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                 Key: IO-271
                 URL: https://issues.apache.org/jira/browse/IO-271
             Project: Commons IO
          Issue Type: Improvement
          Components: Utilities
    Affects Versions: 2.0.1
            Reporter: Stephen Kestle


File.listFiles() uses up to a bit over 2 times as much memory as File.list().  The latter
should be used in doCopyDirectory where there is no filter specified.

This memory usage is a problem when copying directories with hundreds of thousands of files.

I was also thinking of the option of implementing a file filter (that could be composed with
the inputted filter) that would batch the file copy operation; copy the first 10000 (that
match), then the next 10000 etc etc.

Because of the lack of ordering consistency (between runs) of File.listFiles(), there would
need to be a final file filter that would accept files that have not successfully been copied.

I'm primarily concerned about copying into an empty directory (I validate this beforehand),
but for general operation where it's a merge, the modification date re-writing should only
be done in the final run of copies so that while batching occurs (and indeed the final "missed"
filtering) files do not get copied if they have been modified after the start time. (I presume
that I'm reading FileUtils correctly in that it overrides files...)

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