Synchronization fix in case SparkContext is used from multiple threads.
Synchronization fix in case SparkContext is used from multiple threads.

zhouyejoe/spark,aokolnychyi/spark,highfei2011/spark,HyukjinKwon/spark,aosagie/spark,WeichenXu123/spark,SHASHANKB/spark,byakuinss/spark,1haodian/spark,ueshin/apache-spark,mdespriee/spark,jianran/spark,maropu/spark,liyichao/spark,apache-spark-on-k8s/spark,witgo/spark,zero323/spark,bOOm-X/spark,gioenn/xSpark,zuotingbing/spark,vinodkc/spark,shubhamchopra/spark,aosagie/spark,rezasafi/spark,setjet/spark,srowen/spark,stanzhai/spark,alunarbeach/spark,apache/spark,esi-mineset/spark,ericvandenbergfb/spark,bOOm-X/spark,lyogavin/spark,witgo/spark,maropu/spark,janewangfb/spark,taroplus/spark,pgandhi999/spark,guoxiaolongzte/spark,dotunolafunmiloye/spark,zhouyejoe/spark,WindCanDie/spark,jrshust/spark,MLnick/spark,SnappyDataInc/spark,bdrillard/spark,WindCanDie/spark,aokolnychyi/spark,debugger87/spark,mkolod/incubator-spark,bravo-zhang/spark,jiangxb1987/spark,sachintyagi22/spark,jianran/spark,1haodian/spark,liyichao/spark,liutang123/spark,ueshin/apache-spark,rednaxelafx/apache-spark,mdespriee/spark,darionyaphet/spark,gengliangwang/spark,rednaxelafx/apache-spark,zzcclp/spark,nlalevee/spark,pronix/spark,gioenn/xSpark,facaiy/spark,ptkool/spark,rikima/spark,sryza/spark,ConeyLiu/spark,nilsgrabbert/spark,maropu/spark,adrian-ionescu/apache-spark,zhouyejoe/spark,kevinyu98/spark,joseph-torres/spark,pronix/spark,alunarbeach/spark,saltstar/spark,JoshRosen/spark,tengpeng/spark,hhbyyh/spark,rjpower/spark,lvdongr/spark,sachintyagi22/spark,adrian-ionescu/apache-spark,highfei2011/spark,sryza/spark,cloudera/spark,rekhajoshm/spark,lyogavin/spark,JoshRosen/spark,wangyum/spark,koeninger/spark,janewangfb/spark,publicRoman/spark,liyichao/spark,metamx/spark,Aegeaner/spark,ibm-research-ireland/sparkoscope,zero323/spark,ddna1021/spark,aray/spark,poffuomo/spark,sureshthalamati/spark,matthewfranglen/spark,SnappyDataInc/spark,Aegeaner/spark,mahak/spark,rednaxelafx/apache-spark,esi-mineset/spark,cloud-fan/spark,caneGuy/spark,tengpeng/spark,JerryLead/spark,kimoonkim/spark,holdenk/spark,sureshthalamati/spark,icexelloss/spark,adrian-ionescu/apache-spark,kissmetrics/spark,liyichao/spark,jianran/spark,big-pegasus/spark,WeichenXu123/spark,rekhajoshm/spark,ddna1021/spark,dongjoon-hyun/spark,milliman/spark,UndeadBaneGitHub/spark,JerryLead/spark,vinodkc/spark,jiangxb1987/spark,ajaysaini725/spark,minixalpha/spark,aokolnychyi/spark,saltstar/spark,ahnqirage/spark,JoshRosen/spark,caneGuy/spark,metamx/spark,mdespriee/spark,LantaoJin/spark,akopich/spark,hvanhovell/spark,pronix/spark,andrewor14/spark,sachintyagi22/spark,ddna1021/spark,michalsenkyr/spark,rekhajoshm/spark,vax11780/spark,someorz/spark,aosagie/spark,setjet/spark,cloud-fan/spark,aokolnychyi/spark,sureshthalamati/spark,wangmiao1981/spark,dhruve/spark,JerryLead/spark,joseph-torres/spark,kimoonkim/spark,andrewor14/spark,liyichao/spark,joseph-torres/spark,ahnqirage/spark,shaneknapp/spark,brad-kaiser/spark,ioana-delaney/spark,witgo/spark,jkbradley/spark,brad-kaiser/spark,techaddict/spark,dotunolafunmiloye/spark,adrian-ionescu/apache-spark,UndeadBaneGitHub/spark,rekhajoshm/spark,wangyum/spark,hhbyyh/spark,andrewor14/iolap,brad-kaiser/spark,andrewor14/iolap,alunarbeach/spark,michalsenkyr/spark,kiszk/spark,jkbradley/spark,BryanCutler/spark,yanboliang/spark,jrshust/spark,cloud-fan/spark,sachintyagi22/spark,lyogavin/spark,skonto/spark,xflin/spark,saltstar/spark,liyichao/spark,zuotingbing/spark,markhamstra/spark,mike0sv/spark,joseph-torres/spark,nchammas/spark,dbtsai/spark,BryanCutler/spark,ankurdave/arthur,sachintyagi22/spark,esi-mineset/spark,MLnick/spark,lyogavin/spark,cloud-fan/spark,spark-test/spark,liutang123/spark,narahari92/spark,rikima/spark,akopich/spark,Panos-Bletsos/spark-cost-model-optimizer,poffuomo/spark,spark-test/spark,stanzhai/spark,chuckchen/spark,sryza/spark,hhbyyh/spark,Aegeaner/spark,darionyaphet/spark,mzl9039/spark,nlalevee/spark,kiszk/spark,xflin/spark,zuotingbing/spark,haowu80s/spark,MLnick/spark,goldmedal/spark,metamx/spark,koeninger/spark,1haodian/spark,mike0sv/spark,dhruve/spark,wangyum/spark,vinodkc/spark,mzl9039/spark,zero323/spark,stanzhai/spark,sureshthalamati/spark,janewangfb/spark,hvanhovell/spark,patrick-nicholson/spark,someorz/spark,map222/spark,joseph-torres/spark,dongjoon-hyun/spark,jianran/spark,jrshust/spark,narahari92/spark,sahilTakiar/spark,mdespriee/spark,eyalfa/spark,caneGuy/spark,tejasapatil/spark,setjet/spark,UndeadBaneGitHub/spark,ahnqirage/spark,mdespriee/spark,minixalpha/spark,tengpeng/spark,nlalevee/spark,1haodian/spark,saturday-shi/spark,wangyum/spark,mdespriee/spark,gengliangwang/spark,poffuomo/spark,ibm-research-ireland/sparkoscope,rekhajoshm/spark,liutang123/spark,liutang123/spark,alunarbeach/spark,gioenn/xSpark,ron8hu/spark,zuotingbing/spark,actuaryzhang/spark,ron8hu/spark,zhouyejoe/spark,spark-test/spark,rezasafi/spark,poffuomo/spark,kissmetrics/spark,ajaysaini725/spark,lyogavin/spark,darionyaphet/spark,guoxiaolongzte/spark,dotunolafunmiloye/spark,wzhfy/spark,ankurdave/arthur,shuangshuangwang/spark,facaiy/spark,Panos-Bletsos/spark-cost-model-optimizer,nchammas/s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/spark,panfengfeng/spark,panfengfeng/spark,nilsgrabbert/spark,ahnqirage/spark,vinodkc/spark,HyukjinKwon/spark,skonto/spark,brad-kaiser/spark,kissmetrics/spark,someorz/spark,map222/spark,shuangshuangwang/spark,haowu80s/spark,Aegeaner/spark,guoxiaolongzte/spark,goldmedal/spark,mzl9039/spark,highfei2011/spark,rednaxelafx/apache-spark,bdrillard/spark,zero323/spark,ConeyLiu/spark,cloud-fan/spark,SnappyDataInc/spark,lvdongr/spark,BryanCutler/spark,LantaoJin/spark,shuangshuangwang/spark,jlopezmalla/spark,ConeyLiu/spark,xflin/spark,taroplus/spark,highfei2011/spark,shubhamchopra/spark,milliman/spark,xuanyuanking/spark,ahnqirage/spark,szhem/spark,ajaysaini725/spark,cloud-fan/spark,szhem/spark,wangmiao1981/spark,xuanyuanking/spark,byakuinss/spark,andrewor14/iolap,taroplus/spark,mahak/spark,aray/spark,shuangshuangwang/spark,wangyum/spark,hvanhovell/spark,kimoonkim/spark,michalsenkyr/spark,tengpeng/spark,jrshust/spark,metamx/spark,someorz/spark,bOOm-X/spark,SnappyDataInc/spark,mike0sv/spark,janewangfb/spark,actuaryzhang/spark,ibm-research-ireland/sparkoscope,srowen/spark,LantaoJin/spark,BryanCutler/spark,loneknightpy/spark,aosagie/spark,ioana-delaney/spark,ioana-delaney/spark,rezasafi/spark,debugger87/spark,setjet/spark,shaneknapp/spark,kevinyu98/spark,jrshust/spark,nilsgrabbert/spark,icexelloss/spark,haowu80s/spark,cin/spark,saturday-shi/spark,koeninger/spark,huang1900/spark,zero323/spark,maropu/spark,WeichenXu123/spark,ueshin/apache-spark,brad-kaiser/spark,wzhfy/spark,witgo/spark,debugger87/spark,mzl9039/spark,jianran/spark,nchammas/spark,andrewor14/spark,markhamstra/spark,ajaysaini725/spark,yanboliang/spark,srowen/spark,SnappyDataInc/spark,alunarbeach/spark,saltstar/spark,ddna1021/spark,jiangxb1987/spark,zuotingbing/spark,BryanCutler/spark,huang1900/spark,wangyum/spark,jlopezmalla/spark,mzl9039/spark,mzl9039/spark,loneknightpy/spark,jianran/spark,caneGuy/spark,andrewor14/iolap,wangmiao1981/spark,andrewor14/spark,SHASHANKB/spark,1haodian/spark,vinodkc/spark,caneGuy/spark,ahnqirage/spark,bOOm-X/spark,skonto/spark,aray/spark,Panos-Bletsos/spark-cost-model-optimizer,rikima/spark,sryza/spark,panfengfeng/spark,chuckchen/spark,zhouyejoe/spark,mahak/spark,shubhamchopra/spark,LantaoJin/spark,holdenk/spark,ioana-delaney/spark,cin/spark,guoxiaolongzte/spark,akopich/spark,pgandhi999/spark,minixalpha/spark,hhbyyh/spark,mike0sv/spark,wzhfy/spark,kiszk/spark,kissmetrics/spark,markhamstra/spark,ron8hu/spark,lvdongr/spark,yanboliang/spark,wzhfy/spark,eyalfa/spark,tengpeng/spark,cloudera/spark,techaddict/spark,esi-mineset/spark,hvanhovell/spark,skonto/spark,patrick-nicholson/spark,Aegeaner/spark,spark-test/spark,kevinyu98/spark,1haodian/spark,saltstar/spark,brad-kaiser/spark,patrick-nicholson/spark,kissmetrics/spark,MLnick/spark,WindCanDie/spark,dhruve/spark,debugger87/spark,aray/spark,joseph-torres/spark,ptkool/spark,goldmedal/spark,highfei2011/spark,milliman/spark,HyukjinKwon/spark,aray/spark,wzhfy/spark,eyalfa/spark,publicRoman/spark,cloud-fan/spark,ibm-research-ireland/sparkoscope,witgo/spark,facaiy/spark,adrian-ionescu/apache-spark,bdrillard/spark,kissmetrics/spark,spark-test/spark,janewangfb/spark,pgandhi999/spark,xuanyuanking/spark,mahak/spark,nilsgrabbert/spark,koeninger/spark,lvdongr/spark,ddna1021/spark,aray/spark,ericvandenbergfb/spark,sahilTakiar/spark,sahilTakiar/spark,andrewor14/spark,techaddict/spark,byakuinss/spark,kevinyu98/spark,yanboliang/spark,actuaryzhang/spark,WindCanDie/spark,lxsmnv/spark,pronix/spark,MLnick/spark,icexelloss/spark,jkbradley/spark,UndeadBaneGitHub/spark,tejasapatil/spark,hvanhovell/spark,mkolod/incubator-spark,srowen/spark,apache/spark,ron8hu/spark,zhouyejoe/spark,SHASHANKB/spark,akopich/spark,jkbradley/spark,gengliangwang/spark,haowu80s/spark,dbtsai/spark,zzcclp/spark,jiangxb1987/spark,wangmiao1981/spark,cloudera/spark,jrshust/spark,xflin/spark,nchammas/spark,rikima/spark,vax11780/spark,cin/spark,JerryLead/spark,cloudera/spark,goldmedal/spark,apache-spark-on-k8s/spark,panfengfeng/spark,LantaoJin/spark,Panos-Bletsos/spark-cost-model-optimizer,jlopezmalla/spark,chuckchen/spark,mahak/spark,lvdongr/spark,kimoonkim/spark,dongjoon-hyun/spark,metamx/spark,dbtsai/spark,WeichenXu123/spark,publicRoman/spark,chuckchen/spark,actuaryzhang/spark,mahak/spark,skonto/spark,stanzhai/spark,sahilTakiar/spark,loneknightpy/spark,vinodkc/spark,byakuinss/spark,HyukjinKwon/spark,ericvandenbergfb/spark,zzcclp/spark,witgo/spark,zuotingbing/spark,narahari92/spark,ioana-delaney/spark,nchammas/spark,apache/spark,HyukjinKwon/spark,dhruve/spark,tejasapatil/spark,ankurdave/arthur,minixalpha/spark,lxsmnv/spark,zzcclp/spark,patrick-nicholson/spark,rezasafi/spark,rekhajoshm/spark,dotunolafunmiloye/spark,rednaxelafx/apache-spark,nilsgrabbert/spark,holdenk/spark,xflin/spark,bdrillard/spark,wzhfy/spark,tengpeng/spark,huang1900/spark,eyalfa/spark,techaddict/spark,goldmedal/spark,BryanCutler/spark,MLnick/spark,yanboliang/spark,gengliangwang/spark,UndeadBaneGitHub/spark,byakuinss/spark,panfengfeng/spark,setjet/spark,adrian-ionescu/apach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