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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6356) Add a Cache for AbstractFileSystem in the new FileContext/AbstractFileSystem framework.
Date Mon, 14 Dec 2009 23:09:18 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12790435#action_12790435
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Tsz Wo (Nicholas), SZE commented on HADOOP-6356:
------------------------------------------------

> 3. Improve performance as mentioned by Dhruba. I suspect the improvement was negligible.

In the current implementation, performance improvement is actually negligible since (a) we
do not expect a large number of FileSystem objects and (b) RPC also has a connection cache,
i.e. the connections will be re-used even there is no FileSystem cache.

> Add a Cache for AbstractFileSystem in the new FileContext/AbstractFileSystem framework.
> ---------------------------------------------------------------------------------------
>
>                 Key: HADOOP-6356
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6356
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>    Affects Versions: 0.22.0
>            Reporter: Sanjay Radia
>            Assignee: Sanjay Radia
>             Fix For: 0.22.0
>
>
> The new filesystem framework, FileContext and AbstractFileSystem does not implement a
cache for AbstractFileSystem.
> This Jira proposes to add a cache to the new framework just like with the old FileSystem.

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