nsqd: dont open diskqueue writeFile with O_APPEND
nsqd: dont open diskqueue writeFile with O_APPEND

O_APPEND causes every write to first seek to the end of the file.
In cases where data was written to the end of a file but uncommitted
to the metadata position (due to process crash, etc.) subsequent
writes would be performed at the wrong position (we already seek()
to the commited write position when opening a writeFile)

rpau/nsq,jlr52/nsq,w3hacker/nsq,msn217/nsq,judwhite/nsq-0.3.2-win,beni55/nsq,jehiah/nsq,mreiferson/nsq,lcp0578/nsq,ShinichR/nsq,absolute8511/nsq,kesutton/nsq,bitly/nsq,menghan/nsq,coderhaoxin/nsq,gaowenbin/nsq,Dieterbe/nsq,chrislusf/nsq,kesutton/nsq,MadBomber/nsq,ploxiln/nsq,mreiferson/nsq,wuxu92/nsq,propellerads/nsq,philipbo/nsq,chaosue/nsq,yh453926638/nsq,qinlodestar/nsq,nsqio/nsq,msn217/nsq,youxidev/nsq,OlafRadicke/nsq,coderhaoxin/nsq,mikeqian/nsq,bo406/nsq,bo406/nsq,myhongkongzhen/nsq,w4ngyi/nsq,nimmen/nsq,handsomesun/nsq,philipbo/nsq,nieanan/nsq,xiexingguang/nsq,ploxiln/nsq,magastzheng/nsq,absolute8511/nsq,CrazyJvm/nsq,xuzhaokui/nsq,mikedewar/nsq,jehiah/nsq,coderhaoxin/nsq,sparklxb/nsq,sparklxb/nsq,bitly/nsq,yh453926638/nsq,kevinc0825/nsq,moander/nsq,moander/nsq,jmptrader/nsq,sunminghong/nsq,mreiferson/nsq,Dieterbe/nsq,ShinichR/nsq,beni55/nsq,CrazyJvm/nsq,rpau/nsq,dinedal/nsq,MadBomber/nsq,handsomesun/nsq,xiexingguang/nsq,chrislusf/nsq,jmptrader/nsq,w4ngyi/nsq,wmydz1/nsq,xiexingguang/nsq,mynameisfiber/nsq,coderhaoxin/nsq,youxidev/nsq,bo406/nsq,mashuai/nsq,elubow/nsq,philipbo/nsq,moander/nsq,qinlodestar/nsq,bitly/nsq,myhongkongzhen/nsq,MadBomber/nsq,Dieterbe/nsq,msn217/nsq,wmydz1/nsq,mikedewar/nsq,mikedewar/nsq,absolute8511/nsq,youxidev/nsq,shanemhansen/nsq,mikeqian/nsq,MadBomber/nsq,ShinichR/nsq,shanemhansen/nsq,szqh97/nsq,judwhite/nsq-0.3.2-win,Dieterbe/nsq,philipbo/nsq,yh453926638/nsq,elubow/nsq,beni55/nsq,mikeqian/nsq,ploxiln/nsq,nieanan/nsq,propellerads/nsq,lcp0578/nsq,propellerads/nsq,magastzheng/nsq,w4ngyi/nsq,sparklxb/nsq,myhongkongzhen/nsq,nsqio/nsq,w3hacker/nsq,mashuai/nsq,seanluo/nsq_with_note,seanluo/nsq_with_note,19hz/nsq,nsqio/nsq,gaowenbin/nsq,w4ngyi/nsq,dmarkham/nsq,szqh97/nsq,lcp0578/nsq,rpau/nsq,w4ngyi/nsq,chrislusf/nsq,philipbo/nsq,gaowenbin/nsq,tophymastery/nsq,MadBomber/nsq,gaowenbin/nsq,chaosue/nsq,lytics/nsq,ploxiln/nsq,chaosue/nsq,rpau/nsq,szqh97/nsq,mashuai/nsq,mikeqian/nsq,coderhaoxin/nsq,yh453926638/nsq,handsomesun/nsq,svmehta/nsq,szqh97/nsq,19hz/nsq,jlr52/nsq,jsocol/nsq,sparklxb/nsq,magastzheng/nsq,nieanan/nsq,lytics/nsq,kesutton/nsq,bo406/nsq,nimmen/nsq,CrazyJvm/nsq,chaosue/nsq,mashuai/nsq,szqh97/nsq,xiexingguang/nsq,nsqio/nsq,lcp0578/nsq,jlr52/nsq,kevinc0825/nsq,beni55/nsq,lcp0578/nsq,OlafRadicke/nsq,pombredanne/nsq,wuxu92/nsq,beni55/nsq,xuzhaokui/nsq,19hz/nsq,CrazyJvm/nsq,rpau/nsq,wuxu92/nsq,bitly/nsq,xiexingguang/nsq,jsocol/nsq,kesutton/nsq,myhongkongzhen/nsq,svmehta/nsq,nsqio/nsq,wmydz1/nsq,kesutton/nsq,msn217/nsq,judwhite/nsq-0.3.2-win,handsomesun/nsq,chaosue/nsq,mashuai/nsq,wmydz1/nsq,kevinc0825/nsq,jlr52/nsq,mynameisfiber/nsq,mreiferson/nsq,jehiah/nsq,dinedal/nsq,datastream/nsq,jlr52/nsq,xuzhaokui/nsq,CrazyJvm/nsq,chrisroberts/nsq,ploxiln/nsq,handsomesun/nsq,sparklxb/nsq,jehiah/nsq,qinlodestar/nsq,qinlodestar/nsq,OlafRadicke/nsq,jmptrader/nsq,ShinichR/nsq,sunminghong/nsq,Dieterbe/nsq,datastream/nsq,mreiferson/nsq,absolute8511/nsq,gaowenbin/nsq,qinlodestar/nsq,ShinichR/nsq,menghan/nsq,wmydz1/nsq,yh453926638/nsq,chrisroberts/nsq,dmarkham/nsq,tophymastery/nsq,jehiah/nsq,bitly/nsq,myhongkongzhen/nsq,msn217/nsq,bo406/nsq,mikeqian/nsq,pombredanne/nsq,absolute8511/nsq