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Feature #4770
closedkrbd: consider including write data with layered existence check
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Development
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Description
Josh suggested we could pass along the data to be written
along with the STAT op sent to the osd for a target object
for a write to a layered image.
If the stat succeeds, the write would then be done. If the
stat failed, the write would not be performed.
Doing this saves a round trip latency for objects that
already exist, at the expense of the bandwidth consumption
of sending the data twice for those that do not.
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