[jira] [Updated] (HADOOP-7967) Need generalized multi-token filesystem support

["Daryn Sharp (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-7967?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daryn Sharp updated HADOOP-7967:
--------------------------------

    Attachment: HADOOP-7967-2.patch

Took a slightly different approach to avoid changing semi-private apis.  Added {{getFileSystems}} that returns a unique list of filesystems.  This prevents the {{TokenCache}} from trying to use the service of a filesystem (like viewfs) as a key into its hash, when the filesystem is never going to return a token with that service.  Whereas the flattened {{FileSystem}} list allows the {{TokenCache}} to safely "assume" the service of the token that will be returned.  I'll try to further cleanup the {{TokenCache}} later.
                
> 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: 0.24.0, 0.23.1
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>         Attachments: HADOOP-7967-2.patch, HADOOP-7967.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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