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Posted to user@cassandra.apache.org by Jonathan Ellis <jb...@gmail.com> on 2010/04/16 17:52:07 UTC

Re: Cassandra 0.5.1 slow down after doing a lot of inserts

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.