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https://issues.apache.org/jira/browse/HADOOP-14444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16138603#comment-16138603
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Steve Loughran commented on HADOOP-14444:
-----------------------------------------
* I'd like to have people playing with this, people who have the need to use
the ftp code. It's only through that where we find problems.
* we are pretty much feature complete for 3.0, and I'd like to target this to
3.1. Not just for the new client, but because of the changes it'll bring to the
packaging. I don't want to complicate what has become fairly complex right now
(there's lots of shading going on, see).
* I haven't had time to play with this myself. I'm keeping an eye on it so it
doesn't languish, lost --nobody likes that
> New implementation of ftp and sftp filesystems
> ----------------------------------------------
>
> Key: HADOOP-14444
> URL: https://issues.apache.org/jira/browse/HADOOP-14444
> Project: Hadoop Common
> Issue Type: New Feature
> Components: fs
> Affects Versions: 2.8.0
> Reporter: Lukas Waldmann
> Assignee: Lukas Waldmann
> Attachments: HADOOP-14444.2.patch, HADOOP-14444.3.patch,
> HADOOP-14444.4.patch, HADOOP-14444.5.patch, HADOOP-14444.6.patch,
> HADOOP-14444.7.patch, HADOOP-14444.8.patch, HADOOP-14444.9.patch,
> HADOOP-14444.patch
>
>
> Current implementation of FTP and SFTP filesystems have severe limitations
> and performance issues when dealing with high number of files. Mine patch
> solve those issues and integrate both filesystems such a way that most of the
> core functionality is common for both and therefore simplifying the
> maintainability.
> The core features:
> * Support for HTTP/SOCKS proxies
> * Support for passive FTP
> * Support for explicit FTPS (SSL/TLS)
> * Support of connection pooling - new connection is not created for every
> single command but reused from the pool.
> For huge number of files it shows order of magnitude performance improvement
> over not pooled connections.
> * Caching of directory trees. For ftp you always need to list whole directory
> whenever you ask information about particular file.
> Again for huge number of files it shows order of magnitude performance
> improvement over not cached connections.
> * Support of keep alive (NOOP) messages to avoid connection drops
> * Support for Unix style or regexp wildcard glob - useful for listing a
> particular files across whole directory tree
> * Support for reestablishing broken ftp data transfers - can happen
> surprisingly often
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