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Date: Mon, 14 Aug 2017 16:10:00 +0000 (UTC)
From: "Lukas Waldmann (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Message-ID: <JIRA.13073806.1495447867000.26271.1502727000515@Atlassian.JIRA>
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References: <JIRA.13073806.1495447867000@Atlassian.JIRA> <JIRA.13073806.1495447867183@jira-lw-us.apache.org>
Subject: [jira] [Commented] (HADOOP-14444) New implementation of ftp and
 sftp filesystems
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archived-at: Mon, 14 Aug 2017 16:10:07 -0000


    [ https://issues.apache.org/jira/browse/HADOOP-14444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16125892#comment-16125892 ] 

Lukas Waldmann commented on HADOOP-14444:
-----------------------------------------

Hi, I have been off for few days.
How we move forward from here? Build doesn't report any issues, neither there are any comments from community


> 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.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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