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https://issues.apache.org/jira/browse/HADOOP-6356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13268657#comment-13268657
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Daryn Sharp commented on HADOOP-6356:
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There are a number of cases where filesystems maintain state, such the verify
and write checksum flags, but also the implicit acquisition of delegation
tokens by hftp and webhdfs. I completely agree that a global afs cache would
be bad (there are many other issues with it than discussed here), but I think a
per-fc cache of the accessed afs instances would prevent the loss of state.
> 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
>
> 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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