Hello. I am using Cassandra 0.6.1 on ubuntu 8.04. 3 node cluster. I notice that when I start making lots of read requests (serially), memory usage of jsvc keeps climbing until it uses up all memory on the server (happens for all 3 servers in the cluster). At that point, the box starts swapping a little (but not too much) and performance is degraded. Read performance does not drop off a cliff, but it does take a serious hit (maybe 50%).
I have tried setting Xmx to various different values, but it doesnt seem to limit the growth in memory usage. I understand that I should expect to see jsvc use a bit more memory than what the jvm is configured to use, but it doesnt seem to be limited to just an overhead. I have set Xmx all the way down to 128M (just to test) and still jsvc will use up 2G of memory. Are there other settings that I should be changing? Note that when I test by simply running a lot of writes but no reads, jsvc seems to respect the Xmx value. Thanks! Kyusik Chung
