Send ACK to master once every second.
Send ACK to master once every second.

ACKs can be also used as a base for synchronous replication. However in
that case they'll be explicitly requested by the master when the client
sends a request that needs to be replicated synchronously.

j0hnma/hszredis,ReadCode/redis-3.0-annotated,SummonY/redis,jxwr/redis,wangyikai/redis,citusdata/redis,linfangrong/redis,tjschuck/redis,ituncle/redis,Sciumo/redis,simplestbest/redis,xuzhezhaozhao/redis_reading,alenslan/redis,ytjiang/redis,ouyangkongtong/redis,StevenTsai/redis,himoca/redis,ReadCode/redis-3.0-annotated,yossigo/redis,cnbin/redis,modulexcite/redis,ttuna/msot-redis,shreesundara/redis,pietern/redis,weizijun/redis,yybirdcf/learn-redis,izhoujie/redis,ofirluzon/redis,xujunhai1991/redis,izhoujie/redis,GitHubMota/redis,honestme/redis,himoca/redis,gilala/redis,takeshineshiro/redis,zhiliaoniu/redis,ncopa/redis,190235047/redis,rogerlz/redis,colstrom/redis,arijitvt/redis,idning/redis,Aaron1992/redis,jackyan/redis,jbochi/parallel_redis,GrimDerp/redis,a-pavlov/redis,ttuna/msot-redis,buobao/redis-3.0-annotated,adamweixuan/redis-3.0-annotated,wuyu201321060203/redis-3.0-annotated,ErikDubbelboer/redis,MasahikoSawada/redis,SyntaxStacks/redis,whille/redis-3.0-annotated,aim-for-better/redis,sunlianqiang/redis-3.0-annotated,xuzhezhaozhao/redis_reading,onlymellb/redis-3.0-annotated,nuxeh/redis,gilala/bjredis,idning/redis,MOON-CLJ/redis,ituncle/redis,nilyang/redis-tdd-annotation,mengzhejin/RedisStudy,shshlzh/redis-3.0-annotated,magastzheng/redis-3.0-annotated,YuanZhewei/redis,mumingv/redis,timothyohare/3rdPartySrc-redis,supasate/redis,pietern/redis,abhiklodh/redis,gongice/redis-3.0-annotated,neomantra/redis,AplayER/redis,sunheehnus/redis,jasonkying/redis,pedigree/redis,MSOpenTech/redis,Hailei/redis,programmecat/redis,badboy/redis,kaushik94/redis,supasate/redis,fankeke/redis-3.0-annotated,cloudrain21/redis,HunanTV/redis,tellapart/redis,wujf/redis,xujunhai1991/redis,flashbuckets/redis,ofirluzon/redis,vincent-vivian-liu/redis,tjschuck/redis,pkdevbox/redis,clamoriniere1A/redis,guker/redis,davidradunz/redis,HouKangkang/redis-3.0-annotated,neomantra/redis,zczhuohuo/redis,iandyh/redis,PradheepShrinivasan/redis,HouKangkang/redis-3.0-annotated,YongMan/redis,mgk/redis,ouyangkongtong/redis,dongqifan2/redis-3.0-annotated,twskipper/redis,YuraLukashik/redis,clamoriniere1A/redis,josiahcarlson/redis,gilala/bjredis,soveran/redis,seppo0010/rlite-server,arijitvt/redis,fengshao0907/redis-3.0-annotated,janekmi/redis,seppo0010/rlite-server,MasahikoSawada/redis,MasahikoSawada/redis,soloestoy/redis,spinlock/redis,Markgorden/redis,xlzhan/redis,soloestoy/redis,honestme/redis,jbochi/redis,dreamquster/redis,jbochi/redis,linfangrong/redis,takeshineshiro/redis,rogerlz/redis,kensou97/redis,alenslan/redis,dreamquster/redis,zczhuohuo/redis,ketor/redis,mengyou0304/redis,ketor/redis,kensou97/redis,zguangyu/redis,seppo0010/rlite-server,j0hnma/szredis,gilala/hbjredis,wbailey5/redis,rogerchina/redis,MasahikoSawada/redis,Hailei/redis,flashbuckets/redis,zhaobo1023/redis-3.0-annotated,xuguruogu/redis,hgl888/redis,OmarQunsul/graph-redis,elkingtonmcb/redis,hornen/redis,dayuoba/redis,pmem/redis,narma/redis,tzq668766/redis-3.0-annotated,YongMan/redis,190235047/redis,healerkx/redis,gechong/redis-3.0-annotated,weizijun/redis,duanx/redis,SyntaxStacks/redis,xuzhezhaozhao/redis_reading,guker/redis,sunheehnus/redis,gaoxianglong/redis,nilyang/redis-tdd-annotation,dongqifan2/redis-3.0-annotated,pcarrier/redis,idning/redis,hawkchch/redis,darksideofthemoo/redis-histogram,davidradunz/redis,nilyang/redis-tdd-annotation,qiyang0221/redis,StevenTsai/redis,Aliceljm1/redis,moonbingbing/redis-3.0-annotated,whille/redis-3.0-annotated,charsyam/redis,hedisdb/hedis,hornen/redis,Aliceljm1/redis-3.0-annotated,maodeyi/redis_lua,pmem/redis,programmecat/redis,hawkchch/redis,jingjidejuren/redis,simplestbest/redis,h0x91b/redis,whille/redis-3.0-annotated,mattsta/redis,Sciumo/redis,darksideofthemoo/redis-histogram,NBSW/redis,mumingv/redis-3.0-annotated,gilala/hbjredis,iandyh/redis,ttuna/msot-redis,qiyang0221/redis,gilala/hredis,netroby/redis,AALEKH/redis,fankeke/redis-3.0-annotated,rouzier/redis,cusspvz/redis,JoeWoo/redis,ctripcorp/redis,yuhc/redis-benchmark-enhanced,arijitvt/redis,Wangyao14cyy/redis,davidradunz/redis,wbailey5/redis,0x55/redis-3.0-annotated,nilyang/redis-tdd-annotation,gilala/redis,tzq668766/redis-3.0-annotated,kensou97/redis,Aliceljm1/redis,xlzhan/redis,jbochi/parallel_redis,mumingv/redis-3.0-annotated,atreeyang/redis,JoeWoo/redis,YongMan/redis,programmecat/redis,wenxueliu/redis_comment,GitHubMota/redis,mattsta/redis,zhcy/redis,louisliangjun/redis,ytjiang/redis,seppo0010/rlite-server,wangyikai/redis,slfs007/mk-redis,saisai/redis,ttuna/msot-redis,holstvoogd/redis,spinlock/redis,seandsky/redis,spearhead-ea/redis,louisliangjun/redis,ksarch-saas/redis,fengshao0907/redis,WorkingOfTimtohyZhang/redis-3.0-annotated,nnog/redis,jasonkying/redis,magastzheng/redis-3.0-annotated,Wangyao14cyy/redis,rogerchina/redis,brg-liuwei/redis,itamarhaber/redis,StevenTsai/redis,jingjidejuren/redis,Soledad89/redis,itugs/redis,yybirdcf/learn-redis,hornen/redis,j0hnma/szredis,Aaron1992/redis,CodeJuan/redis,huyuezheng/redis,allengaller/redis,devaos/redis,mattsta/redis,GrimDerp/redis,csuhawk/redis,holstvoogd/redis,citusdata/redis,OmarQunsul/graph-redis,ErikDubbelboer/redis,itugs/redis,july2993/redis,PKRoma/redis,taoguan/redis,ReadCode/redis-3.0-annotated,mumingv/redis,Markgorden/redis,seppo0010/redis,vincent-vivian-liu/redis,jackyan/redis,onlymellb/redis-3.0-annotated,tanghaodong25/redis,RepmujNetsik/redis,mgk/redis,4396/redis,blackmady/redis,moonbingbing/redis-3.0-annotated,tanghaodong25/redis,supasate/redis,kmiku7/redis,abhiklodh/redis,elkingtonmcb/redis,iandyh/redis,Soledad89/redis,drinkthere/redis-3.0-annotated,shining-yang/redis,wuyu201321060203/redis-3.0-annotated,wujf/redis,mingyaaaa/redis,louisliangjun/redis,yuhc/redis-benchmark-enhanced,narma/redis,spearhead-ea/redis,zhiliaoniu/redis,yybirdcf/learn-redis,AplayER/redis,janekmi/redis,louisliangjun/redis,riyan8250/redis,huangz1990/experiment-redis,tjschuck/redis,gilala/redis,jingjidejuren/redis,itamarhaber/redis,huangz1990/experiment-redis,roth1002/redis,colstrom/redis,qiyang0221/redis,wenxueliu/redis_comment,j0hnma/szredis,ton31337/redis,shining-yang/redis,haima-zju/redis-3.0-annotated,netroby/redis,NBSW/redis,ketor/redis,saisai/redis,a-pavlov/redis,YuraLukashik/redis,abhiklodh/redis,RepmujNetsik/redis,huangz1990/redis-3.0-annotated,badboy/redis,thomasdarimont/redis,xujunhai1991/redis,zczhuohuo/redis,modulexcite/redis,RepmujNetsik/redis,brg-liuwei/redis,simplestbest/redis,yuhc/redis-benchmark-enhanced,adamweixuan/redis-3.0-annotated,seppo0010/redis,oranagra/redis,josiahcarlson/redis,neomantra/redis,huangz1990/experiment-redis,zhoudayang/redis,antirez/redis,ncopa/redis,taoguan/redis,jbochi/redis,badboy/redis,colstrom/redis,tzq668766/redis-3.0-annotated,AALEKH/redis,cusspvz/redis,HouKangkang/redis-3.0-annotated,brg-liuwei/redis,drinkthere/redis-3.0-annotated,atreeyang/redis,davidradunz/redis,harrisonfeng/redis,gilala/hbjredis,blackmady/redis,xlzhan/redis,a-pavlov/redis,universsky/redis,Aliceljm1/redis,msn217/redis-3.0-annotated,itamarhaber/redis,mcanthony/redis,saisai/redis,valdsJohn/redis,blackmady/redis,gilala/hredis,shshlzh/redis-3.0-annotated,programmecat/redis,soloestoy/redis,mingyaaaa/redis,Wangyao14cyy/redis,ncopa/redis,z-fork/redis,yybirdcf/learn-redis,pcarrier/redis,harrisonfeng/redis,miaoyc1989/redis-3.0-annotated,hawkchch/redis,kensou97/redis,july2993/redis,unasm/redis-3.0-annotated,nuxeh/redis,mengyou0304/redis,MOON-CLJ/redis,itugs/redis,MOON-CLJ/redis,blackmady/redis,tellapart/redis,shreesundara/redis,pedigree/redis,ipmobiletech/redis,jacklee0810/redis-3.0-annotated,Soledad89/redis,huangz1990/experiment-redis,gilala/bjredis,alenslan/redis,xuzhezhaozhao/redis_reading,saisai/redis,190235047/redis,mumingv/redis-3.0-annotated,oranagra/redis,kmiku7/redis,guker/redis,wbailey5/redis,kaushik94/redis,duanx/redis,0x55/redis-3.0-annotated,healerkx/redis,roth1002/redis,AALEKH/redis,mcanthony/redis,xuguruogu/redis,csuhawk/redis,MSOpenTech/redis,modulexcite/redis,gaoxianglong/redis,unasm/redis-3.0-annotated,harrisonfeng/redis,huyuezheng/redis,rogerchina/redis,charsyam/redis,drinkthere/redis-3.0-annotated,MSOpenTech/redis,honestme/redis,atreeyang/redis,netroby/redis,jackyan/redis,NBSW/redis,itugs/redis,pcarrier/redis,HeartSaVioR/redis,splitice/redis,janekmi/redis,ytjiang/redis,pkdevbox/redis,Wangyao14cyy/redis,hornen/redis,OmarQunsul/graph-redis,zhcy/redis,mingyaaaa/redis,ipmobiletech/redis,ofirluzon/redis,yuzhangjob/redis-3.0-annotated-unstable,LongXQ/redis,mengyou0304/redis,z-fork/redis,NBSW/redis,mcanthony/redis,roth1002/redis,AALEKH/redis,LongXQ/redis,cnbin/redis,hedisdb/hedis,honestme/redis,darksideofthemoo/redis-histogram,MSOpenTech/redis,twskipper/redis,mengzhejin/RedisStudy,pmem/redis,zhoudayang/redis,dongqifan2/redis-3.0-annotated,z-fork/redis,seppo0010/redis,fengshao0907/redis,zhaobo1023/redis-3.0-annotated,seppo0010/redis,OmarQunsul/graph-redis,spinlock/redis,shining-yang/redis,josiahcarlson/redis,Markgorden/redis,HunanTV/redis,vincent-vivian-liu/redis,shreesundara/redis,csuhawk/redis,roth1002/redis,zy416548283/redis-3.0-annotated,harrisonfeng/redis,4396/redis,antirez/redis,ton31337/redis,rogerchina/redis,haima-zju/redis-3.0-annotated,wujf/redis,mingyaaaa/redis,itamarhaber/redis,zhcy/redis,hedisdb/hedis,xujunhai1991/redis,allengaller/redis,Aliceljm1/redis,wbailey5/redis,valdsJohn/redis,csuhawk/redis,fengshao0907/redis-3.0-annotated,Hailei/redis,charsyam/redis,mverrilli/redis,duanx/redis,duanx/redis,ncopa/redis,HunanTV/redis,Aliceljm1/redis-3.0-annotated,4396/redis,GrimDerp/redis,rrsean/redis-3.0-annotated,zczhuohuo/redis,cloudrain21/redis,vincent-vivian-liu/redis,darksideofthemoo/redis-histogram,JoeWoo/redis,timothyohare/3rdPartySrc-redis,taoguan/redis,rouzier/redis,ytjiang/redis,thomasdarimont/redis,SummonY/redis,holstvoogd/redis,jacklee0810/redis-3.0-annotated,yossigo/redis,mumingv/redis,kaushik94/redis,zy416548283/redis-3.0-annotated,dreamquster/redis,ErikDubbelboer/redis,weizijun/redis,ituncle/redis,4396/redis,wprice/redis,pmem/redis,YuraLukashik/redis,ramonsnir/redis,slfs007/mk-redis,h0x91b/redis,AplayER/redis,zguangyu/redis,ipmobiletech/redis,antirez/redis,elkingtonmcb/redis,shshlzh/redis-3.0-annotated,ctripcorp/redis,Aliceljm1/redis-3.0-annotated,rrsean/redis-3.0-annotated,arijitvt/redis,YuraLukashik/redis,shining-yang/redis,wujf/redis,slfs007/mk-redis,miaoyc1989/redis-3.0-annotated,flashbuckets/redis,ofirluzon/redis,mgk/redis,jingjidejuren/redis,HunanTV/redis,healerkx/redis,july2993/redis,gongice/redis-3.0-annotated,mverrilli/redis,ttuna/msot-redis,francischan714/redis,j0hnma/szredis,francischan714/redis,pedigree/redis,supasate/redis,riyan8250/redis,CodeJuan/redis,SummonY/redis,brg-liuwei/redis,qiyang0221/redis,soveran/redis,fengshao0907/redis,gechong/redis-3.0-annotated,YongMan/redis,rouzier/redis,hgl888/redis,nuxeh/redis,gongice/redis-3.0-annotated,simplestbest/redis,zguangyu/redis,tanghaodong25/redis,cnbin/redis,ctripcorp/redis,splitice/redis,nnog/redis,july2993/redis,wenxueliu/redis_comment,pietern/redis,mumingv/redis,universsky/redis,zy416548283/redis-3.0-annotated,cloudrain21/redis,mverrilli/redis,gaoxianglong/redis,soloestoy/redis,timothyohare/3rdPartySrc-redis,devaos/redis,dayuoba/redis,aim-for-better/redis,yossigo/redis,devaos/redis,buobao/redis-3.0-annotated,maodeyi/redis_lua,MSOpenTech/redis,jasonkying/redis,AplayER/redis,JoeWoo/redis,xuguruogu/redis,CodeJuan/redis,adamweixuan/redis-3.0-annotated,seandsky/redis,tellapart/redis,wuyu201321060203/redis-3.0-annotated,SummonY/redis,zguangyu/redis,huangz1990/redis-3.0-annotated,h0x91b/redis,wangyikai/redis,clamoriniere1A/redis,modulexcite/redis,yuzhangjob/redis-3.0-annotated-unstable,hgl888/redis,narma/redis,unasm/redis-3.0-annotated,0x55/redis-3.0-annotated,soloestoy/redis,atreeyang/redis,aim-for-better/redis,RepmujNetsik/redis,ksarch-saas/redis,wangyikai/redis,PradheepShrinivasan/redis,nnog/redis,rouzier/redis,kaushik94/redis,miaoyc1989/redis-3.0-annotated,SyntaxStacks/redis,splitice/redis,Aaron1992/redis,sunlianqiang/redis-3.0-annotated,izhoujie/redis,PradheepShrinivasan/redis,thomasdarimont/redis,HeartSaVioR/redis,timothyohare/3rdPartySrc-redis,healerkx/redis,colstrom/redis,mengzhejin/RedisStudy,a-pavlov/redis,StevenTsai/redis,ramonsnir/redis,abhiklodh/redis,universsky/redis,WorkingOfTimtohyZhang/redis-3.0-annotated,ksarch-saas/redis,fengshao0907/redis-3.0-annotated,ksarch-saas/redis,ton31337/redis,sunlianqiang/redis-3.0-annotated,Soledad89/redis,wprice/redis,soveran/redis,GitHubMota/redis,GitHubMota/redis,twskipper/redis,neomantra/redis,guker/redis,0x55/redis-3.0-annotated,wuyu201321060203/redis-3.0-annotated,wprice/redis,cusspvz/redis,riyan8250/redis,YuanZhewei/redis,yossigo/redis,kmiku7/redis,idning/redis,linfangrong/redis,badboy/redis,HeartSaVioR/redis,cnbin/redis,seandsky/redis,yossigo/redis,hawkchch/redis,mgk/redis,190235047/redis,neomantra/redis,j0hnma/hszredis,zhcy/redis,gilala/redis,xlzhan/redis,ofirluzon/redis,wenxueliu/redis_comment,flashbuckets/redis,citusdata/redis,PradheepShrinivasan/redis,PKRoma/redis,devaos/redis,ouyangkongtong/redis,Aaron1992/redis,francischan714/redis,jbochi/parallel_redis,xuguruogu/redis,hedisdb/hedis,dreamquster/redis,ituncle/redis,pkdevbox/redis,splitice/redis,valdsJohn/redis,francischan714/redis,aim-for-better/redis,sunheehnus/redis,h0x91b/redis,GrimDerp/redis,magastzheng/redis-3.0-annotated,valdsJohn/redis,takeshineshiro/redis,cusspvz/redis,PKRoma/redis,linfangrong/redis,citusdata/redis,WorkingOfTimtohyZhang/redis-3.0-annotated,riyan8250/redis,ramonsnir/redis,alenslan/redis,sunheehnus/redis,seandsky/redis,PKRoma/redis,thomasdarimont/redis,oranagra/redis,LongXQ/redis,pkdevbox/redis,rogerlz/redis,YuanZhewei/redis,ctripcorp/redis,huyuezheng/redis,gilala/hredis,j0hnma/hszredis,msn217/redis-3.0-annotated,nnog/redis,elkingtonmcb/redis,fankeke/redis-3.0-annotated,weizijun/redis,wprice/redis,yuhc/redis-benchmark-enhanced,netroby/redis,oranagra/redis,HeartSaVioR/redis,iandyh/redis,josiahcarlson/redis,tanghaodong25/redis,ErikDubbelboer/redis,Sciumo/redis,haima-zju/redis-3.0-annotated,miaoyc1989/redis-3.0-annotated,PKRoma/redis,yuzhangjob/redis-3.0-annotated-unstable,shreesundara/redis,zhaobo1023/redis-3.0-annotated,allengaller/redis,shshlzh/redis-3.0-annotated,SyntaxStacks/redis,nuxeh/redis,fengshao0907/redis,YuanZhewei/redis,allengaller/redis,tellapart/redis,charsyam/redis,moonbingbing/redis-3.0-annotated,takeshineshiro/redis,oranagra/redis,huangz1990/redis-3.0-annotated,mcanthony/redis,dayuoba/redis,janekmi/redis,rrsean/redis-3.0-annotated,jackyan/redis,msn217/redis-3.0-annotated,zhiliaoniu/redis,jxwr/redis,cloudrain21/redis,dayuoba/redis,jacklee0810/redis-3.0-annotated,j0hnma/hszredis,kmiku7/redis,soveran/redis,LongXQ/redis,zhiliaoniu/redis,gechong/redis-3.0-annotated,z-fork/redis,gilala/hbjredis,mengyou0304/redis,antirez/redis,Sciumo/redis,jxwr/redis,rogerlz/redis,hgl888/redis,holstvoogd/redis,Hailei/redis,Markgorden/redis,himoca/redis,maodeyi/redis_lua,mverrilli/redis,ton31337/redis,jasonkying/redis,CodeJuan/redis,zhoudayang/redis,tjschuck/redis,spearhead-ea/redis,twskipper/redis,izhoujie/redis,pietern/redis,ipmobiletech/redis,onlymellb/redis-3.0-annotated,taoguan/redis,buobao/redis-3.0-annotated,universsky/redis,charsyam/redis,gaoxianglong/redis,zhoudayang/redis,pcarrier/redis,huyuezheng/redis,pedigree/redis,ouyangkongtong/redis,clamoriniere1A/redis,mengzhejin/RedisStudy,spinlock/redis,gilala/bjredis,gilala/hredis