ceph/PendingReleaseNotes
Sage Weil a9e5323586 osd: remove magical tmap -> omap conversion
This is incomplete and unfortunately unusable in its current state:

 - it would only set USES_TMAP for old encoded object_info_t and tmapput,
   but would NOT set it for tmapup
 - a config option turned that off by default.

That means that the mds conversion from tmap -> omap won't be able to use
this because any existing cluster has tmap objects without the USES_TMAP
flag set.  And we don't want to unconditionally try a tmap->omap conversion
on omap operations because there are lots of existing librados users out
there that will be negatively impacted by this.

Instead, the MDS will need to handle this conversion on the client side by
reading either tmap or omap objects and explicitly rewriting the content
with omap (while truncating the tmap data away).

The auto-conversion function was added in v0.44.

Signed-off-by: Sage Weil <sage@inktank.com>
2013-10-01 17:21:21 -07:00

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v0.70
~~~~~
* librados::Rados::pool_create_async() and librados::Rados::pool_delete_async()
don't drop a reference to the completion object on error, caller needs to take
care of that. This has never really worked correctly and we were leaking an
object
* 'ceph osd crush set <id> <weight> <loc..>' no longer adds the osd to the
specified location, as that's a job for 'ceph osd crush add'. It will
however continue to work just the same as long as the osd already exists
in the crush map.
* The OSD now enforces that class write methods cannot both mutate an
object and return data. The rbd.assign_bid method, the lone
offender, has been removed. This breaks compatibility with
pre-bobtail librbd clients by preventing them from creating new
images.
* librados now returns on commit instead of ack for synchronous calls.
This is a bit safer in the case where both OSDs and the client crash, and
is probably how it should have been acting from the beginning. Users are
unlikely to notice but it could result in lower performance in some
circumstances. Those who care should switch to using the async interfaces,
which let you specify safety semantics precisely.
* The C++ librados AioComplete::get_version() method was incorrectly
returning an int (usually 32-bits). To avoid breaking library
compatibility, a get_version64() method is added that returns the
full-width value. The old method is deprecated and will be removed
in a future release. Users of the C++ librados API that make use of
the get_version() method should modify their code to avoid getting a
value that is truncated from 64 to to 32 bits.
v0.71
~~~~~
* The MDS now disallows snapshots by default as they are not
considered stable. The command 'ceph mds set allow_snaps' will
enable them.
* For clusters that were created before v0.44 (pre-argonaut, Spring
2012) and store radosgw data, the auto-upgrade from TMAP to OMAP
objects has been disabled. Before upgrading, make sure that any
buckets created on pre-argonaut releases have been modified (e.g.,
by PUTing and then DELETEing an object from each bucket). Any
cluster created with argonaut (v0.48) or a later release or not
using radosgw never relied on the automatic conversion and is not
affected by this change.
* Any direct users of the 'tmap' portion of the librados API should be
aware that the automatic tmap -> omap conversion functionality has
been removed.