[RELEASE] - pre tag commit:  '1.2.1-SNAPSHOT'.
[RELEASE] - pre tag commit:  '1.2.1-SNAPSHOT'.

Yelp/zipkin,gneokleo/zipkin,xujianhai/zipkin,srijs/zipkin,coursera/zipkin,coursera/zipkin,rjbhewei/zipkin,jamescway/zipkin,thelastpickle/zipkin,c3p0hz/zipkin,wuqiangxjtu/zipkin,mzagar/zipkin,prat0318/zipkin,hydro2k/zipkin,betable/zipkin,jfeltesse-mdsol/zipkin,Yelp/zipkin,wuqiangxjtu/zipkin,srijs/zipkin,jstanier/zipkin,gneokleo/zipkin,prat0318/zipkin,rjbhewei/zipkin,rjbhewei/zipkin,betable/zipkin,rocwzp/zipkin,gneokleo/zipkin,xujianhai/zipkin,hydro2k/zipkin,prat0318/zipkin,jamescway/zipkin,rocwzp/zipkin,mt0803/zipkin,rocwzp/zipkin,srijs/zipkin,lqjack/zipkin,jfeltesse-mdsol/zipkin,wuqiangxjtu/zipkin,xujianhai/zipkin,yshaojie/zipkin,lqjack/zipkin,mt0803/zipkin,lqjack/zipkin,mzagar/zipkin,betable/zipkin,thelastpickle/zipkin,jstanier/zipkin,rocwzp/zipkin,wuqiangxjtu/zipkin,mzagar/zipkin,mzagar/zipkin,yshaojie/zipkin,betable/zipkin,gneokleo/zipkin,thelastpickle/zipkin,prat0318/zipkin,c3p0hz/zipkin,thelastpickle/zipkin,jamescway/zipkin,Yelp/zipkin,xujianhai/zipkin,coursera/zipkin,jamescway/zipkin,jfeltesse-mdsol/zipkin,lqjack/zipkin,jfeltesse-mdsol/zipkin,c3p0hz/zipkin,mt0803/zipkin,jstanier/zipkin,coursera/zipkin,hydro2k/zipkin,jstanier/zipkin,Yelp/zipkin,c3p0hz/zipkin,yshaojie/zipkin,rjbhewei/zipkin,hydro2k/zipkin,srijs/zipkin,yshaojie/zipkin,mt0803/zipkin