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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-7967) Need generalized multi-token filesystem support
Date Tue, 05 Jun 2012 22:06:39 GMT

     [ 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-compat.patch

Suggested patch that fixes many token acquisition bugs (viewfs, dup tokens, inability to stack
filtered filesystems, etc) w/o changing existing public apis, their semantics, or introducing
incompatibilities.  This is intended only as a short term fix until the apis can be overhauled
as described in a linked jira.
                
> 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
>         Attachments: HADOOP-7967-2.patch, HADOOP-7967-3.patch, HADOOP-7967-4.patch, HADOOP-7967-compat.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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