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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3608) fuse_dfs: detect changes in UID ticket cache
Date Fri, 20 Jul 2012 20:50:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419550#comment-13419550
] 

Hudson commented on HDFS-3608:
------------------------------

Integrated in Hadoop-Mapreduce-trunk-Commit #2528 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Commit/2528/])
    HDFS-3608. fuse_dfs: detect changes in UID ticket cache. Contributed by Colin Patrick
McCabe. (Revision 1363904)

     Result = FAILURE
atm : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1363904
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/CMakeLists.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/CMakeLists.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_connect.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_connect.h
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_context_handle.h
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_dfs.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_file_handle.h
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_impls_chmod.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_impls_chown.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_impls_flush.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_impls_getattr.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_impls_mkdir.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_impls_open.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_impls_read.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_impls_readdir.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_impls_release.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_impls_rename.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_impls_rmdir.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_impls_statfs.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_impls_truncate.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_impls_unlink.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_impls_utimens.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_impls_write.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_init.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/hdfs.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/hdfs.h
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/jni_helper.c
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/util
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/native/util/tree.h
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml

                
> 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
>             Fix For: 2.2.0-alpha
>
>         Attachments: HDFS-3608.004.patch, HDFS-3608.006.patch, HDFS-3608.007.patch, HDFS-3608.008.patch,
HDFS-3608.009.patch, HDFS-3608.010.patch, HDFS-3608.011.patch, HDFS-3608.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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