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Date: Wed, 1 Aug 2012 23:17:04 +0000 (UTC)
From: "Hudson (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-3513) HttpFS should cache filesystems
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    [ https://issues.apache.org/jira/browse/HDFS-3513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13426988#comment-13426988 ] 

Hudson commented on HDFS-3513:
------------------------------

Integrated in Hadoop-Common-trunk-Commit #2550 (See [https://builds.apache.org/job/Hadoop-Common-trunk-Commit/2550/])
    HDFS-3513. HttpFS should cache filesystems. (tucu) (Revision 1368304)

     Result = SUCCESS
tucu : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1368304
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs-httpfs/dev-support/findbugsExcludeFile.xml
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/lib/service/hadoop/FileSystemAccessService.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/resources/httpfs-default.xml
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/lib/service/hadoop/TestFileSystemAccessService.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

                
> HttpFS should cache filesystems
> -------------------------------
>
>                 Key: HDFS-3513
>                 URL: https://issues.apache.org/jira/browse/HDFS-3513
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 2.0.0-alpha
>            Reporter: Alejandro Abdelnur
>            Assignee: Alejandro Abdelnur
>             Fix For: 2.2.0-alpha
>
>         Attachments: HDFS-3513.patch, HDFS-3513.patch, HDFS-3513.patch, HDFS-3513.patch
>
>
> HttpFS opens and closes a FileSystem instance against the backend filesystem (typically HDFS) on every request. The FileSystem caching is not used as it does not have expiration/timeout and filesystem instances in there live forever, for long running services like HttpFS this is not a good thing as it would keep connections open to the NN.

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