Calle Wilund f2c5315d33 commitlog: Add write/flush limits ...

Configured on start (for now - and dummy values at that). 
When shard write/flush count reaches limit, and incoming ops will queue
until previous ones finish. 

Consequently, if an allocation op forces a write, which blocks, any 
other incoming allocations will also queue up to provide back pressure.

2016-01-26 10:19:24 +00:00

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