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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3608) fuse_dfs: detect changes in UID ticket cache
Date Wed, 18 Jul 2012 00:41:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13416771#comment-13416771
] 

Hadoop QA commented on HDFS-3608:
---------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12536906/HDFS-3608.006.patch
  against trunk revision .

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

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

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

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

    +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 hadoop-hdfs-project/hadoop-hdfs.

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

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/2846//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/2846//console

This message is automatically generated.
                
> fuse_dfs: detect changes in UID ticket cache
> --------------------------------------------
>
>                 Key: HDFS-3608
>                 URL: https://issues.apache.org/jira/browse/HDFS-3608
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.1.0-alpha
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>            Priority: Minor
>         Attachments: HDFS-3608.004.patch, HDFS-3608.006.patch
>
>
> Currently in fuse_dfs, if one kinits as some principal "foo" and then does some operation
on fuse_dfs, then kdestroy and kinit as some principal "bar", subsequent operations done via
fuse_dfs will still use cached credentials for "foo". The reason for this is that fuse_dfs
caches Filesystem instances using the UID of the user running the command as the key into
the cache.  This is a very uncommon scenario, since it's pretty uncommon for a single user
to want to use credentials for several different principals on the same box.
> However, we can use inotify to detect changes in the Kerberos ticket cache file and force
the next operation to create a new FileSystem instance in that case.  This will also require
a reference counting mechanism in fuse_dfs so that we can free the FileSystem classes when
they refer to previous Kerberos ticket caches.
> Another mechanism is to run a stat periodically on the ticket cache file.  This is a
good fallback mechanism if inotify does not work on the file (for example, because it's on
an NFS mount.)

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