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From "Scott Embler (JIRA)" <>
Subject [jira] [Updated] (VFS-492) Support FEAT and MLSx commands for FTP performance improvements.
Date Thu, 05 Sep 2013 16:08:51 GMT


Scott Embler updated VFS-492:

    Attachment: ftp-mlsx.patch
> Support FEAT and MLSx commands for FTP performance improvements.
> ----------------------------------------------------------------
>                 Key: VFS-492
>                 URL:
>             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
>              Labels: noob, patch, performance
>         Attachments: ftp-mlsx.patch
>   Original Estimate: 1h
>  Remaining Estimate: 1h
> 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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