perf: skip future cancellation when not needed #151
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it implicitly throws an expensive exception
jasonk000
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pkarumanchi9,
srrangarajan,
akashdeepgoel and
samuelfu
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It implicitly throws an expensive exception. Some codepaths throw away the errorFuture, so there is no need to issue the cancel/throw the exception.
This is approximately half of the CPU overhead on the caller thread for the
getAsynccall.