Hi: We have build a storage system with 4 nodes in the cluster. We use the default configuration file, every node have 2*E5504 CPU, 8G memory and 6*1T Sata disk. The cluster stores about 600G data.
We found that Cassandra 0.5.1 ALWAYS slow down after a lot of inserts. When it happens, CPU and Disk load are very low. We use "tpstats" nodetools and find that more than 300,000 row-mutations is still pending and the write speed is no more than 100~200 row-mutations per second. It also happens when Cassandra starts and replays a large commitlog file. So we must cost several hours to wait it finishs startup. The Faq of Cassandra tells that it is caused by GC? any other explaining? thanks a lot.
