[SPARK-20177] Document about compression way has some little detail ch…
[SPARK-20177] Document about compression way has some little detail ch…

…anges.

## What changes were proposed in this pull request?

Document compression way little detail changes.
1.spark.eventLog.compress add 'Compression will use spark.io.compression.codec.'
2.spark.broadcast.compress add 'Compression will use spark.io.compression.codec.'
3,spark.rdd.compress add 'Compression will use spark.io.compression.codec.'
4.spark.io.compression.codec add 'event log describe'.

eg
Through the documents, I don't know  what is compression mode about 'event log'.

## How was this patch tested?

manual tests

Please review http://spark.apache.org/contributing.html before opening a pull request.

Author: 郭小龙 10207633 <guo.xiaolong1@zte.com.cn>

Closes #17498 from guoxiaolongzte/SPARK-20177.

ioana-delaney/spark,wangmiao1981/spark,yanboliang/spark,witgo/spark,sureshthalamati/spark,szhem/spark,skonto/spark,huang1900/spark,zero323/spark,tengpeng/spark,wzhfy/spark,esi-mineset/spark,minixalpha/spark,apache/spark,jrshust/spark,aray/spark,ahnqirage/spark,ueshin/apache-spark,jrshust/spark,highfei2011/spark,ptkool/spark,sureshthalamati/spark,kissmetrics/spark,pgandhi999/spark,lvdongr/spark,bravo-zhang/spark,nchammas/spark,lxsmnv/spark,mahak/spark,hvanhovell/spark,mahak/spark,jrshust/spark,pgandhi999/spark,JerryLead/spark,andrewor14/spark,kissmetrics/spark,kissmetrics/spark,zzcclp/spark,darionyaphet/spark,joseph-torres/spark,BryanCutler/spark,loneknightpy/spark,janewangfb/spark,facaiy/spark,joseph-torres/spark,xuanyuanking/spark,eyalfa/spark,sahilTakiar/spark,mzl9039/spark,mzl9039/spark,zzcclp/spark,caneGuy/spark,akopich/spark,ericvandenbergfb/spark,WeichenXu123/spark,srowen/spark,1haodian/spark,mzl9039/spark,mike0sv/spark,caneGuy/spark,LantaoJin/spark,aosagie/spark,joseph-torres/spark,publicRoman/spark,sahilTakiar/spark,panfengfeng/spark,apache-spark-on-k8s/spark,loneknightpy/spark,mzl9039/spark,1haodian/spark,xflin/spark,jiangxb1987/spark,mahak/spark,loneknightpy/spark,saltstar/spark,hvanhovell/spark,patrick-nicholson/spark,narahari92/spark,LantaoJin/spark,srowen/spark,debugger87/spark,ericvandenbergfb/spark,WindCanDie/spark,rekhajoshm/spark,kevinyu98/spark,lxsmnv/spark,ericvandenbergfb/spark,facaiy/spark,mdespriee/spark,lvdongr/spark,stanzhai/spark,nchammas/spark,rikima/spark,saltstar/spark,stanzhai/spark,ddna1021/spark,guoxiaolongzte/spark,BryanCutler/spark,aray/spark,lvdongr/spark,dongjoon-hyun/spark,aokolnychyi/spark,MLnick/spark,ConeyLiu/spark,cloud-fan/spark,HyukjinKwon/spark,zzcclp/spark,patrick-nicholson/spark,ajaysaini725/spark,rekhajoshm/spark,saturday-shi/spark,sureshthalamati/spark,sureshthalamati/spark,holdenk/spark,nlalevee/spark,icexelloss/spark,huang1900/spark,alunarbeach/spark,apache/spark,aosagie/spark,wangmiao1981/spark,milliman/spark,rednaxelafx/apache-spark,zhouyejoe/spark,aosagie/spark,ahnqirage/spark,UndeadBaneGitHub/spark,ahnqirage/spark,UndeadBaneGitHub/spark,jkbradley/spark,gengliangwang/spark,saltstar/spark,kevinyu98/spark,caneGuy/spark,yanboliang/spark,szhem/spark,sahilTakiar/spark,janewangfb/spark,spark-test/spark,dhruve/spark,liutang123/spark,HyukjinKwon/spark,tengpeng/spark,adrian-ionescu/apache-spark,UndeadBaneGitHub/spark,ptkool/spark,ron8hu/spark,nchammas/spark,ptkool/spark,setjet/spark,ajaysaini725/spark,jiangxb1987/spark,yanboliang/spark,mdespriee/spark,hvanhovell/spark,dongjoon-hyun/spark,mahak/spark,spark-test/spark,debugger87/spark,cin/spark,minixalpha/spark,nlalevee/spark,poffuomo/spark,pgandhi999/spark,alunarbeach/spark,eyalfa/spark,vinodkc/spark,wzhfy/spark,zzcclp/spark,maropu/spark,hhbyyh/spark,rekhajoshm/spark,yanboliang/spark,taroplus/spark,shuangshuangwang/spark,guoxiaolongzte/spark,vinodkc/spark,adrian-ionescu/apache-spark,shaneknapp/spark,actuaryzhang/spark,cin/spark,JoshRosen/spark,ericvandenbergfb/spark,chuckchen/spark,ioana-delaney/spark,spark-test/spark,shuangshuangwang/spark,spark-test/spark,LantaoJin/spark,SHASHANKB/spark,kiszk/spark,tejasapatil/spark,bdrillard/spark,debugger87/spark,brad-kaiser/spark,Aegeaner/spark,huang1900/spark,loneknightpy/spark,icexelloss/spark,brad-kaiser/spark,icexelloss/spark,spark-test/spark,saltstar/spark,alunarbeach/spark,saturday-shi/spark,WeichenXu123/spark,brad-kaiser/spark,apache/spark,byakuinss/spark,tejasapatil/spark,loneknightpy/spark,ueshin/apache-spark,xuanyuanking/spark,narahari92/spark,mike0sv/spark,alunarbeach/spark,maropu/spark,zuotingbing/spark,SHASHANKB/spark,milliman/spark,apache/spark,szhem/spark,ConeyLiu/spark,jkbradley/spark,patrick-nicholson/spark,akopich/spark,rezasafi/spark,setjet/spark,liyichao/spark,dbtsai/spark,minixalpha/spark,holdenk/spark,byakuinss/spark,rekhajoshm/spark,apache-spark-on-k8s/spark,dongjoon-hyun/spark,shubhamchopra/spark,andrewor14/spark,jlopezmalla/spark,ConeyLiu/spark,liyichao/spark,SHASHANKB/spark,vinodkc/spark,map222/spark,byakuinss/spark,patrick-nicholson/spark,eyalfa/spark,actuaryzhang/spark,ron8hu/spark,WeichenXu123/spark,cin/spark,maropu/spark,esi-mineset/spark,techaddict/spark,saltstar/spark,saltstar/spark,zuotingbing/spark,wangyum/spark,WeichenXu123/spark,jlopezmalla/spark,highfei2011/spark,facaiy/spark,ericvandenbergfb/spark,apache/spark,ptkool/spark,witgo/spark,ueshin/apache-spark,gengliangwang/spark,ericvandenbergfb/spark,kevinyu98/spark,andrewor14/spark,facaiy/spark,eyalfa/spark,aosagie/spark,panfengfeng/spark,chuckchen/spark,wangmiao1981/spark,someorz/spark,mdespriee/spark,JoshRosen/spark,shuangshuangwang/spark,aokolnychyi/spark,kissmetrics/spark,ron8hu/spark,caneGuy/spark,someorz/spark,darionyaphet/spark,lxsmnv/spark,aokolnychyi/spark,brad-kaiser/spark,MLnick/spark,byakuinss/spark,map222/spark,narahari92/spark,xflin/spark,gengliangwang/spark,mike0sv/spark,Aegeaner/spark,shuangshuangwang/spark,nlalevee/spark,esi-mineset/spark,dhruve/spark,srowen/spark,rezasafi/spa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