I don't remember your exact situation but could it be your network connectivity? I know I've been upgrading mine because I'm maxing out fastethernet on a 12 node cluster. Le 20 nov. 2011 22:54, "Jahangir Mohammed" <md.jahangi...@gmail.com> a écrit :
> Mostly, they are I/O and CPU intensive during major compaction. If ganglia > doesn't have anything suspicious there, then what is performance loss ? > Read or write? > On Nov 17, 2011 1:01 PM, "Maxim Potekhin" <potek...@bnl.gov> wrote: > >> In view of my unpleasant discovery last week that deletions in Cassandra >> lead to a very real >> and serious performance loss, I'm working on a strategy of moving forward. >> >> If the tombstones do cause such problem, where should I be looking for >> performance bottlenecks? >> Is it disk, CPU or something else? Thing is, I don't see anything >> outstanding in my Ganglia plots. >> >> TIA, >> >> Maxim >> >>
