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From "Lukas Waldmann (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-14444) New implementation of ftp and sftp filesystems
Date Sun, 02 Jul 2017 15:40:02 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-14444?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lukas Waldmann updated HADOOP-14444:
------------------------------------
    Status: Patch Available  (was: In Progress)

What's in the new patch:
1) Refactoring to hadoop-tools
2) Some changes based on Steve comments (String.format is not everywhere changed to slf4j
format everywhere because the same string is used in exception handling 
3) Tests based on ftp/sftp contract - for cached and non cached variants
4) Separation of unit tests and integration tests
5) contract parameters fs.contract.use.internal.ftpserver and fs.contract.use.internal.sftpserver
specifies if local test servers should be launched while testing
 



> 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.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 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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