Hi Edward, Thank you for response. I have tried the following -
1. I have tried various compaction throughput ranging from 16M to 1G. CPU continued to be low and memory between 40% to 50%. I still see compaction more backing. 2. Does concurrent compactors take effect with Leveled compaction? (yaml says this parameter has no effect with LCS) 3. I have tried multi-threaded compaction as well I do not see change in handling the compaction. 4. I have 24 core CPU, have RAID 10 disks and commitlog on SSD and 48GB or RAM with 8GB Heap. Thanks, Jay On Wed, Apr 17, 2013 at 3:26 PM, Edward Capriolo <edlinuxg...@gmail.com>wrote: > three things: > 1) compaction throughput is fairly low (yaml nodetool) > 2) concurrent compactions is fairly low (yaml) > 3) multithreaded compaction might be off in your version > > Try raising these things. Otherwise consider option 4. > > 4)$$$$$$$$$$$$$$$$$$$$$$$ RAID,RAM<CPU$$$$$$$$$$$$$$ > > > On Wed, Apr 17, 2013 at 4:01 PM, Jay Svc <jaytechg...@gmail.com> wrote: > >> Hi Team, >> >> >> >> I have a high write traffic to my Cassandra cluster. I experience a very >> high number of pending compactions. As I expect higher writes, The pending >> compactions keep increasing. Even when I stop my writes it takes several >> hours to finishing pending compactions. >> >> >> My CF is configured with LCS, with sstable_size_mb=20M. My CPU is below >> 20%, JVM memory usage is between 45%-55%. I am using Cassandra 1.1.9. >> >> >> How can I increase the compaction rate so it will run bit faster to match >> my write speed? >> >> >> Your inputs are appreciated. >> >> >> Thanks, >> >> Jay >> >> >
