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Ran 01 Aug 2018 08:26PM UTC

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Committed 01 Aug 2018 08:15PM UTC coverage: 87.471% (+0.06%) from 87.409%

Job # 11084.1

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push

travis-ci

Committed by

zhangkun83

Commit Message

core: initialize round robin load balancer picker to random index (#4462)

RoundRobinLoadBalancerFactory creates a new Picker instance every time the set of provided address groups changes or the connection state of subchannels associated with existing address groups changes. In certain scenarios, such as deployment/replacement of the target service cluster, this can lead to high churn of Picker objects. Given that each new Picker's subchannel index is initialized to zero, in these scenarios requests can end up getting disproportionately routed through subchannels (and hence server nodes) which are earlier in the list of address groups.

At Netflix we have measured that some service nodes end up taking 3-4x the load that of other nodes during deployment.

This commit randomizes the start index of the RoundRobinLoadBalancerFactory.Picker which eliminates this behavior.

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