Scott Embler created VFS-492:
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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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