I am specifically suggesting you NOT use a heap that large with your 8GB machines. Please test with 4GB first.
On Tue, Apr 6, 2010 at 12:13 AM, Ilya Maykov <ivmay...@gmail.com> wrote: > That does sound similar. It's possible that the difference I'm seeing > between ConsistencyLevel.ZERO and ConsistencyLevel.ALL is simply due > to the fact that using ALL slows down the writers enough that the GC > can keep up. I could do a test with multiple clients writing at ALL in > parallel tomorrow. If there are still no problems writing at ALL even > with extra load from additional clients, that might point to problems > in how async writes are handled vs. sync writes. > > I will also do some profiling of the server processes with both ZERO > and ALL writer behaviors and report back. > > RE: JVM_OPTS, I will try running with the "more sane" options (but a > larger heap) as well. > > -- Ilya > > On Mon, Apr 5, 2010 at 11:59 PM, Rob Coli <rc...@digg.com> wrote: >> On 4/5/10 11:48 PM, Ilya Maykov wrote: >>> >>> No, the disks on all nodes have about 750GB free space. Also as >>> mentioned in my follow-up email, writing with ConsistencyLevel.ALL >>> makes the slowdowns / crashes go away. >> >> I am not sure if the above is consistent with the cause of #896, but the >> other symptoms ("I inserted a bunch of data really fast via Thrift and GC >> melted my machine!") sound like it.. >> >> https://issues.apache.org/jira/browse/CASSANDRA-896 >> >> =Rob >> >