ceph/PendingReleaseNotes

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v0.89
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* New ability to list all objects from all namespaces can fail or return
incomplete results when not all OSDs have been upgraded. Features
rados --all ls, rados cppool, rados export, rados cache-flush-evict-all
and rados cache-try-flush-evict-all can also fail or return incomplete
results.
v0.90
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* Previously, the formatted output of 'ceph pg stat -f ...' was a full
pg dump that included all metadata about all PGs in the system. It
is now a concise summary of high-level PG stats, just like the
unformatted 'ceph pg stat' command.
* All JSON dumps of floating point values were incorrecting surrounding the
value with quotes. These quotes have been removed. Any consumer of structured
JSON output that was consuming the floating point values was previously having
to interpret the quoted string and will most likely need to be fixed to take
the unquoted number.
* 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.