ceph/PendingReleaseNotes

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v0.91
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* The 'category' field for objects has been removed. This was originally added
to track PG stat summations over different categories of objects for use by
radosgw. It is no longer has any known users and is prone to abuse because it
can lead to a pg_stat_t structure that is unbounded. The librados API calls
that accept this field now ignore it, and the OSD no longers tracks the
per-category summations.
* The output for 'rados df' has changed. The 'category' level has been
eliminated, so there is now a single stat object per pool. The structure of
the JSON output is different, and the plaintext output has one less column.
* The 'rados create <objectname> [category]' optional category argument is no
longer supported or recognized.
* rados.py's Rados class no longer has a __del__ method; it was causing
problems on interpreter shutdown and use of threads. If your code has
Rados objects with limited lifetimes and you're concerned about locked
resources, call Rados.shutdown() explicitly.
* There is a new version of the librados watch/notify API with vastly
improved semantics. Any applications using this interface are
encouraged to migrate to the new API. The old API calls are marked
as deprecated and will eventually be removed.
* The librados rados_unwatch() call used to be safe to call on an
invalid handle. The new version has undefined behavior when passed
a bogus value (for example, when rados_watch() returns an error and
handle is not defined).
* The structure of the formatted 'pg stat' command is changed for the
portion that counts states by name to avoid using the '+' character
(which appears in state names) as part of the XML token (it is not
legal).
v0.92
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* The experiemental 'keyvaluestore-dev' OSD backend has been renamed
'keyvaluestore' (for simplicity) and marked as experimental. To
enable this untested feature and acknowledge that you understand
that it is untested and may destroy data, you need to add the
following to your ceph.conf::
enable experimental unrecoverable data corrupting featuers = keyvaluestore