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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3608) fuse_dfs: use inotify to detect changes in UID ticket cache
Date Sat, 07 Jul 2012 01:21:35 GMT
Colin Patrick McCabe created HDFS-3608:
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             Summary: fuse_dfs: use inotify to detect changes in UID ticket cache
                 Key: HDFS-3608
                 URL: https://issues.apache.org/jira/browse/HDFS-3608
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Colin Patrick McCabe
            Assignee: Colin Patrick McCabe
            Priority: Minor


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.

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