More accurate message for compaction applied to a different version
More accurate message for compaction applied to a different version

Test Plan: Compile. Run it.

Reviewers: yhchiang, dhruba, igor

Reviewed By: igor

Subscribers: leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D31479

virtdb/rocksdb,Applied-Duality/rocksdb,vmx/rocksdb,ryneli/rocksdb,vashstorm/rocksdb,wat-ze-hex/rocksdb,rDSN-Projects/rocksdb.replicated,Andymic/rocksdb,wlqGit/rocksdb,makelivedotnet/rocksdb,facebook/rocksdb,SunguckLee/RocksDB,bbiao/rocksdb,siddhartharay007/rocksdb,vmx/rocksdb,caijieming-baidu/rocksdb,ryneli/rocksdb,ryneli/rocksdb,fengshao0907/rocksdb,RyanTech/rocksdb,mbarbon/rocksdb,jalexanderqed/rocksdb,zhangpng/rocksdb,lgscofield/rocksdb,rDSN-Projects/rocksdb.replicated,JoeWoo/rocksdb,JohnPJenkins/rocksdb,Vaisman/rocksdb,Vaisman/rocksdb,vmx/rocksdb,wlqGit/rocksdb,dkorolev/rocksdb,norton/rocksdb,tsheasha/rocksdb,luckywhu/rocksdb,Vaisman/rocksdb,vmx/rocksdb,Applied-Duality/rocksdb,RyanTech/rocksdb,caijieming-baidu/rocksdb,wenduo/rocksdb,wenduo/rocksdb,biddyweb/rocksdb,wenduo/rocksdb,tsheasha/rocksdb,hobinyoon/rocksdb,makelivedotnet/rocksdb,temicai/rocksdb,ryneli/rocksdb,JoeWoo/rocksdb,rDSN-Projects/rocksdb.replicated,Andymic/rocksdb,virtdb/rocksdb,hobinyoon/rocksdb,siddhartharay007/rocksdb,JohnPJenkins/rocksdb,Applied-Duality/rocksdb,norton/rocksdb,siddhartharay007/rocksdb,siddhartharay007/rocksdb,hobinyoon/rocksdb,anagav/rocksdb,Applied-Duality/rocksdb,caijieming-baidu/rocksdb,lgscofield/rocksdb,JoeWoo/rocksdb,fengshao0907/rocksdb,OverlordQ/rocksdb,NickCis/rocksdb,RyanTech/rocksdb,NickCis/rocksdb,SunguckLee/RocksDB,ylong/rocksdb,lgscofield/rocksdb,flabby/rocksdb,NickCis/rocksdb,OverlordQ/rocksdb,JackLian/rocksdb,zhangpng/rocksdb,bbiao/rocksdb,fengshao0907/rocksdb,vashstorm/rocksdb,geraldoandradee/rocksdb,caijieming-baidu/rocksdb,NickCis/rocksdb,amyvmiwei/rocksdb,Vaisman/rocksdb,tsheasha/rocksdb,OverlordQ/rocksdb,wenduo/rocksdb,facebook/rocksdb,JackLian/rocksdb,wskplho/rocksdb,geraldoandradee/rocksdb,kaschaeffer/rocksdb,wat-ze-hex/rocksdb,wlqGit/rocksdb,virtdb/rocksdb,RyanTech/rocksdb,SunguckLee/RocksDB,zhangpng/rocksdb,hobinyoon/rocksdb,jalexanderqed/rocksdb,norton/rocksdb,jalexanderqed/rocksdb,hobinyoon/rocksdb,vashstorm/rocksdb,geraldoandradee/rocksdb,kaschaeffer/rocksdb,bbiao/rocksdb,caijieming-baidu/rocksdb,biddyweb/rocksdb,ylong/rocksdb,amyvmiwei/rocksdb,biddyweb/rocksdb,vashstorm/rocksdb,vashstorm/rocksdb,OverlordQ/rocksdb,facebook/rocksdb,hobinyoon/rocksdb,kaschaeffer/rocksdb,tizzybec/rocksdb,tizzybec/rocksdb,skunkwerks/rocksdb,virtdb/rocksdb,jalexanderqed/rocksdb,Andymic/rocksdb,temicai/rocksdb,NickCis/rocksdb,sorphi/rocksdb,wskplho/rocksdb,flabby/rocksdb,wenduo/rocksdb,wat-ze-hex/rocksdb,alihalabyah/rocksdb,dkorolev/rocksdb,temicai/rocksdb,biddyweb/rocksdb,NickCis/rocksdb,amyvmiwei/rocksdb,norton/rocksdb,SunguckLee/RocksDB,lgscofield/rocksdb,tsheasha/rocksdb,Andymic/rocksdb,Andymic/rocksdb,geraldoandradee/rocksdb,geraldoandradee/rocksdb,Vaisman/rocksdb,alihalabyah/rocksdb,zhangpng/rocksdb,virtdb/rocksdb,ryneli/rocksdb,mbarbon/rocksdb,caijieming-baidu/rocksdb,fengshao0907/rocksdb,RyanTech/rocksdb,ryneli/rocksdb,bbiao/rocksdb,JohnPJenkins/rocksdb,dkorolev/rocksdb,SunguckLee/RocksDB,Vaisman/rocksdb,wlqGit/rocksdb,SunguckLee/RocksDB,mbarbon/rocksdb,lgscofield/rocksdb,ylong/rocksdb,Andymic/rocksdb,norton/rocksdb,alihalabyah/rocksdb,luckywhu/rocksdb,temicai/rocksdb,wskplho/rocksdb,RyanTech/rocksdb,flabby/rocksdb,OverlordQ/rocksdb,skunkwerks/rocksdb,OverlordQ/rocksdb,jalexanderqed/rocksdb,kaschaeffer/rocksdb,siddhartharay007/rocksdb,tizzybec/rocksdb,wenduo/rocksdb,RyanTech/rocksdb,dkorolev/rocksdb,biddyweb/rocksdb,mbarbon/rocksdb,JohnPJenkins/rocksdb,mbarbon/rocksdb,sorphi/rocksdb,tizzybec/rocksdb,sorphi/rocksdb,zhangpng/rocksdb,fengshao0907/rocksdb,temicai/rocksdb,JackLian/rocksdb,skunkwerks/rocksdb,anagav/rocksdb,rDSN-Projects/rocksdb.replicated,tsheasha/rocksdb,bbiao/rocksdb,wat-ze-hex/rocksdb,zhangpng/rocksdb,OverlordQ/rocksdb,dkorolev/rocksdb,makelivedotnet/rocksdb,wenduo/rocksdb,IMCG/RcoksDB,JohnPJenkins/rocksdb,temicai/rocksdb,siddhartharay007/rocksdb,wat-ze-hex/rocksdb,luckywhu/rocksdb,sorphi/rocksdb,virtdb/rocksdb,Applied-Duality/rocksdb,alihalabyah/rocksdb,makelivedotnet/rocksdb,wat-ze-hex/rocksdb,norton/rocksdb,Applied-Duality/rocksdb,hobinyoon/rocksdb,ylong/rocksdb,wenduo/rocksdb,lgscofield/rocksdb,alihalabyah/rocksdb,dkorolev/rocksdb,jalexanderqed/rocksdb,wskplho/rocksdb,biddyweb/rocksdb,anagav/rocksdb,wat-ze-hex/rocksdb,wat-ze-hex/rocksdb,alihalabyah/rocksdb,kaschaeffer/rocksdb,tizzybec/rocksdb,sorphi/rocksdb,IMCG/RcoksDB,amyvmiwei/rocksdb,zhangpng/rocksdb,SunguckLee/RocksDB,skunkwerks/rocksdb,lgscofield/rocksdb,bbiao/rocksdb,JoeWoo/rocksdb,dkorolev/rocksdb,luckywhu/rocksdb,flabby/rocksdb,bbiao/rocksdb,skunkwerks/rocksdb,tsheasha/rocksdb,NickCis/rocksdb,wlqGit/rocksdb,vashstorm/rocksdb,flabby/rocksdb,SunguckLee/RocksDB,anagav/rocksdb,skunkwerks/rocksdb,facebook/rocksdb,sorphi/rocksdb,kaschaeffer/rocksdb,Applied-Duality/rocksdb,rDSN-Projects/rocksdb.replicated,tsheasha/rocksdb,tizzybec/rocksdb,IMCG/RcoksDB,hobinyoon/rocksdb,fengshao0907/rocksdb,wlqGit/rocksdb,wskplho/rocksdb,IMCG/RcoksDB,vmx/rocksdb,JoeWoo/rocksdb,norton/rocksdb,geraldoandradee/rocksdb,luckywhu/rocksdb,anagav/rocksdb,facebook/rocksdb,JoeWoo/rocksdb,rDSN-Projects/rocksdb.replicated,bbiao/rocksdb,vmx/rocksdb,sorphi/rocksdb,fengshao0907/rocksdb,facebook/rocksdb,siddhartharay007/rocksdb,JackLian/rocksdb,kaschaeffer/rocksdb,vashstorm/rocksdb,jalexanderqed/rocksdb,anagav/rocksdb,JoeWoo/rocksdb,makelivedotnet/rocksdb,mbarbon/rocksdb,IMCG/RcoksDB,wlqGit/rocksdb,amyvmiwei/rocksdb,norton/rocksdb,flabby/rocksdb,mbarbon/rocksdb,facebook/rocksdb,JohnPJenkins/rocksdb,Andymic/rocksdb,alihalabyah/rocksdb,Andymic/rocksdb,ylong/rocksdb,wskplho/rocksdb,temicai/rocksdb,ylong/rocksdb,biddyweb/rocksdb,IMCG/RcoksDB,JackLian/rocksdb,caijieming-baidu/rocksdb,IMCG/RcoksDB,tizzybec/rocksdb,wskplho/rocksdb,skunkwerks/rocksdb,vmx/rocksdb,luckywhu/rocksdb,vmx/rocksdb,ylong/rocksdb,rDSN-Projects/rocksdb.replicated,facebook/rocksdb,makelivedotnet/rocksdb,JackLian/rocksdb,luckywhu/rocksdb,ryneli/rocksdb,makelivedotnet/rocksdb,flabby/rocksdb,JohnPJenkins/rocksdb,virtdb/rocksdb,amyvmiwei/rocksdb,JackLian/rocksdb,anagav/rocksdb,amyvmiwei/rocksdb,tsheasha/rocksdb,geraldoandradee/rocksdb,Vaisman/rocksdb