v0.78 firefly
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* The default leveldb cache size for the ceph-osd daemon has been
  increased from 4 MB to 128 MB.  This will increase the memory
  footprint of that process but tends to increase performance of omap
  (key/value) objects (used for CephFS and the radosgw).  If memory in your
  deployment is tight, you can preserve the old behavio by adding::

    leveldb write buffer size = 0
    leveldb cache size = 0

  to your ceph.conf to get back the (leveldb) defaults.

v0.79
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