Better pre-sizing of a buffer for `toString()'.
Better pre-sizing of a buffer for `toString()'.

Change-Id: I233653d7c34d80f95db329a0349c67a25d9fc1ac

tempbottle/asynchbase,adityakishore/asynchbase,StumbleUponArchive/asynchbase,OpenTSDB/asynchbase,manolama/asynchbase,yuzhu712/asynchbase,manolama/asynchbase,StumbleUponArchive/asynchbase,hzy001/asynchbase,OpenTSDB/asynchbase,mway08/asynchbase,Flipboard/asynchbase,pythian/asynchbase,Connexity/asynchbase,angushe/asynchbase,yuzhu712/asynchbase,SteamShon/asynchbase,adityakishore/asynchbase,hzy001/asynchbase,mapr/asynchbase,tsuna/asynchbase,tempbottle/asynchbase,SteamShon/asynchbase,nvoron23/asynchbase,mway08/asynchbase,OpenTSDB/asyncbigtable,angushe/asynchbase,manolama/asyncbigtable,Connexity/asynchbase,tsuna/asynchbase,hhshuai/asynchbase,hhshuai/asynchbase,Flipboard/asynchbase,nvoron23/asynchbase,mapr/asynchbase