Calle Wilund 2913241df1 memtable/commitlog: Change bookkeep to track individul segments ...

Use per CF-id reference count instead, and use handles as result of 
add operations. These must either be explicitly released or stored
(rp_set), or they will release the corresponding replay_position
upon destruction. 

Note: this does _not_ remove the replay positioning ordering requirement
for mutations. It just removes it as a means to track segment liveness.

2017-06-07 12:07:01 +00:00

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