[jira] Updated: (HADOOP-6356) Add a Cache for AbstractFileSystem in the new FileContext/AbstractFileSystem framework.

["Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-6356?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz Wo (Nicholas), SZE updated HADOOP-6356:
-------------------------------------------

    Component/s: fs

The existing FileSystem.CACHE serves the following purposes:
# Cleanup FileSystem objects during shutdown.  This includes processing deleteOnExit and closing RPC connections in hdfs.
# Help closing files.
# Improve performance as mentioned by Dhruba.  I suspect the improvement was negligible.

If we choose not to add cache to the new framework, we have to support (1) somehow.

> 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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