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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14444) New implementation of ftp and sftp filesystems
Date Mon, 04 Dec 2017 14:31:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16276848#comment-16276848
] 

Steve Loughran commented on HADOOP-14444:
-----------------------------------------

Good to hear Adam. Lukas: announce on common-dev and ask for help testing & reviewing

> 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-14444.10.patch, HADOOP-14444.11.patch, HADOOP-14444.12.patch,
HADOOP-14444.13.patch, 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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