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Posted to common-issues@hadoop.apache.org by "Arun C Murthy (JIRA)" <ji...@apache.org> on 2012/10/11 19:45:30 UTC
[jira] [Closed] (HADOOP-7967) Need generalized multi-token
filesystem support
[ https://issues.apache.org/jira/browse/HADOOP-7967?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Arun C Murthy closed HADOOP-7967.
---------------------------------
> 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
> Fix For: 0.23.3, 2.0.2-alpha
>
> Attachments: HADOOP-7967-2.patch, HADOOP-7967-3.patch, HADOOP-7967-4.patch, HADOOP-7967-compat.patch, hadoop7967-deltas.patch, hadoop7967-javadoc.patch, HADOOP-7967.newapi.2.patch, HADOOP-7967.newapi.3.patch, HADOOP-7967.newapi.4.patch, HADOOP-7967.newapi.5.patch, HADOOP-7967.newapi.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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