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Merge pull request #4197 from zmstone/improve-shared-sup-random-start-point-for-roundrobin 

improve(shared-sub): Randomise the startpoint for round-robin
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Zaiming Shi 2021-02-18 13:26:01 +01:00 committed by GitHub
parent eec64e440d db461179c5
commit d2bd9b4078
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1 changed files with 1 additions and 1 deletions
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src/emqx_shared_sub.erl
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@ -282,7 +282,7 @@ do_pick_subscriber(_Group, _Topic, hash_topic, _ClientId, SourceTopic, Count) ->
1 + erlang:phash2(SourceTopic) rem Count;
do_pick_subscriber(Group, Topic, round_robin, _ClientId, _SourceTopic, Count) ->
Rem = case erlang:get({shared_sub_round_robin, Group, Topic}) of
undefined -> 0;
undefined -> rand:uniform(Count) - 1;
N -> (N + 1) rem Count
end,
_ = erlang:put({shared_sub_round_robin, Group, Topic}, Rem),