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From "Scott Embler (JIRA)" <j...@apache.org>
Subject [jira] [Created] (VFS-492) Support FEAT and MLSx commands for FTP performance improvements.
Date Thu, 05 Sep 2013 16:06:52 GMT
Scott Embler created VFS-492:
--------------------------------

             Summary: Support FEAT and MLSx commands for FTP performance improvements.
                 Key: VFS-492
                 URL: https://issues.apache.org/jira/browse/VFS-492
             Project: Commons VFS
          Issue Type: Improvement
    Affects Versions: 2.0
         Environment: Development:
 Windows 7 Pro.
 Java 1.7.0_25
 Eclipse SDK 4.2.2

Target:
 All
            Reporter: Scott Embler
            Priority: Minor


While using VFS to synchronize/push files between a local file system and an FTP server I
noticed severe performance issues whenever the FTP directory had a large number of files.
Each refresh of an FtpFileObject asks for a list of the files in the parent directory, and
then attempts to pick out the information for a single file.  Performance will degrade quickly
as the number of files to be listed increases.

I'd suggest using MLST and MLSD as an alternative to LIST, where possible.  MLST can retrieve
the necessary file information without listing a whole directory.  Both commands also provide
unambiguous time-stamps, which was also a problem that I ran into while trying to compare
modification times between the local and FTP file systems.

Attached is a patch that probably does the job.  In cases where MLSx features are not supported,
the original LIST command will be used.  Tests are included.  Since I'm new to VFS I'm not
sure if this covers all cases, so be warned.

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