Are you running the Levelled compactions strategy ? If so what is the max SSTable size and what is the total data per node?
If you are running it try using a larger SSTable size like 32MB Cheers ----------------- Aaron Morton Freelance Cassandra Consultant New Zealand @aaronmorton http://www.thelastpickle.com On 27/06/2013, at 2:02 PM, sulong <sulong1...@gmail.com> wrote: > According to the OpsCenter records, yes, the compaction was running then, > 8.5mb /s > > > On Thu, Jun 27, 2013 at 9:54 AM, sulong <sulong1...@gmail.com> wrote: > version: 1.2.2 > cluster read requests 800/s, write request 22/s > Sorrry, I don't know whether the compaction was running then. > > > On Thu, Jun 27, 2013 at 1:02 AM, Robert Coli <rc...@eventbrite.com> wrote: > On Tue, Jun 25, 2013 at 10:13 PM, sulong <sulong1...@gmail.com> wrote: > > I have 4 nodes cassandra cluster. Every node has 32G memory, and the > > cassandra jvm uses 8G. The cluster is suffering from gc. Looks like > > CompactionExecutor thread holds too many SSTableReader. See the attachement. > > What version of Cassandra? > What workload? > Is compaction actually running? > > =Rob > >
