Thanks much!!! Better to hear at least one other person sees the same thing ;). Sometimes these posts just go silent.
Dean From: Edward Capriolo <edlinuxg...@gmail.com<mailto:edlinuxg...@gmail.com>> Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" <user@cassandra.apache.org<mailto:user@cassandra.apache.org>> Date: Wednesday, April 24, 2013 2:33 PM To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" <user@cassandra.apache.org<mailto:user@cassandra.apache.org>> Subject: Re: compaction throughput rate not even close to 16MB I have noticed the same. I think in the "real" world your compaction throughput is limited by other things. If I had to speculate I would say that compaction can remove expired tombstones, however doing this requires bloom filter checks, etc. I think that setting is more important with multi threaded compaction and/or more compaction slots. In those cases it may actually throttle something. On Wed, Apr 24, 2013 at 3:54 PM, Hiller, Dean <dean.hil...@nrel.gov<mailto:dean.hil...@nrel.gov>> wrote: I was wondering about the compactionthroughput. I never see ours get even close to 16MB and I thought this is supposed to throttle compaction, right? Ours is constantly less than 3MB/sec from looking at our logs or do I have this totally wrong? How can I see the real throughput so that I can understand how to throttle it when I need to? 94,940,780 bytes to 95,346,024 (~100% of original) in 38,438ms = 2.365603MB/s. 2,350,114 total rows, 2,350,022 unique. Row merge counts were {1:2349930, 2:92, } Thanks, Dean
