SendBatch: Launch one fewer goroutine #230
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A small optimization to reduce the number of goroutines launched by SendBatch, while achieving the same parallelism. This is especially nice for SendBatch calls that only need to reach one Region Server, because then 0 additional goroutines need to be launched.
Also, changed
fail
from a bool + mutex to a uint32 that is atomically set to 1 on failure. This was primarily done to reduce lines of code.