Service Group

When you have multi-impls of a interface,you can distinguish them with the group.


<dubbo:service group="feedback" interface="" />
<dubbo:service group="member" interface="" />


<dubbo:reference id="feedbackIndexService" group="feedback" interface="" />
<dubbo:reference id="memberIndexService" group="member" interface="" />

Any group 1

<dubbo:reference id="barService" interface="" group="*" />
1. supported after version 2.2.0 ,always select only one available group of implementations to invoke.

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