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https://issues.apache.org/jira/browse/HADOOP-7967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13432130#comment-13432130
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Sanjay Radia commented on HADOOP-7967:
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+1 - i have some changes in the delta patch I am attaching.
* Some minor improvements to javadoc and added comments to some tests (in my
delta patch)
* Given that Hadoop 1 did not have audience annotations we can't make
getDelegationToken protected. I have fixed that in my delta patch. Note the
changes you made in tests to call addDelegationTokens instead of
getDelegationToken are correct and should remain.
* File a Jira to make getDelegationTokens protected - lets see if community
feels this can be done at some stage.
* File a Jira to make the corresponding changes to
FileContext/AbstractFileSystem as we discussed.
Thanks for adding more tests and for refactoring some of the test internals.
> Need generalized multi-token filesystem support
> -----------------------------------------------
>
> Key: HADOOP-7967
> URL: https://issues.apache.org/jira/browse/HADOOP-7967
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs, security
> Affects Versions: 0.23.1, 0.24.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Priority: Critical
> Attachments: HADOOP-7967-2.patch, HADOOP-7967-3.patch,
> HADOOP-7967-4.patch, HADOOP-7967-compat.patch, HADOOP-7967.newapi.2.patch,
> HADOOP-7967.newapi.3.patch, HADOOP-7967.newapi.patch, HADOOP-7967.patch,
> hadoop7967-javadoc.patch
>
>
> Multi-token filesystem support and its interactions with the MR
> {{TokenCache}} is problematic. The {{TokenCache}} tries to assume it has the
> knowledge to know if the tokens for a filesystem are available, which it
> can't possibly know for multi-token filesystems. Filtered filesystems are
> also problematic, such as har on viewfs. When mergeFs is implemented, it too
> will become a problem with the current implementation. Currently
> {{FileSystem}} will leak tokens even when some tokens are already present.
> The decision for token acquisition, and which tokens, should be pushed all
> the way down into the {{FileSystem}} level. The {{TokenCache}} should be
> ignorant and simply request tokens from each {{FileSystem}}.
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