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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7967) Need generalized multi-token filesystem support
Date Tue, 07 Feb 2012 17:54:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13202572#comment-13202572
] 

Hadoop QA commented on HADOOP-7967:
-----------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12513643/HADOOP-7967-4.patch
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 eclipse:eclipse.  The patch built with eclipse:eclipse.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    +1 core tests.  The patch passed unit tests in .

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/571//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/571//console

This message is automatically generated.
                
> 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-7967-3.patch, HADOOP-7967-4.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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