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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