Moving to user list. You should read http://wiki.apache.org/cassandra/FAQ#slows_down_after_lotso_inserts
2010/4/16 Lu Ming <xl...@live.com>: > 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.
