Redis INCR concurrency -
i using redis' incr
generate id objects. , use zadd
add object using id key.
do need worry if there multiple connections executing same block of code? after id:12
if 2 connections connect @ same time , both add object using id:13
, 1 of them lost.
since redis single threaded, can never happen - 1 client can make change database @ time.
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