[
https://issues.apache.org/jira/browse/HADOOP-7967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13418608#comment-13418608
]
Sanjay Radia commented on HADOOP-7967:
--------------------------------------
Some early comments:
A suggestion: center the code around "FileSystem#getChildFileSystems()"
* FileSystems which embed others such as ViewFS will only need to implement
getChildFileSystems()
* the default impl of getCanaonicalName will return null if
getChildFileSystems() returns null
* the defaul impl of getDelegationToken will return null if
getChildFileSystems() returns null
* In collectDelegationTokens use "if (getChildFileSystems()==null)" rather than
"if (getCanaonicalName() == null)
{code}
collectDelegationTokens(....) {
....
children = getChildFileSystems();
if (children == null) { // get token directly from FS
... your code ...
} else { // get the tokens from the children
... your code
}
}
{code}
> 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.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}}.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
