Your problem is probably not the amount of data you store, but the number of
SSTable files. When these increase, read latency goes up. Write latency maybe
goes up because of compaction. Check in the data directory, whether there are
many
data files, and check via JMX whether compaction is happening.
My recommendation is to reduce the write traffic to the nodes so that each node
can
keep up with compaction. If reducing the load is not possible, you have to add
nodes
(or get faster hard disks, but that is often not possible).
Martin
________________________________
From: hive13 Wong [mailto:hiv...@gmail.com]
Sent: Thursday, June 10, 2010 2:58 PM
To: user@cassandra.apache.org
Subject: single node capacity
Hi,
How much data load can a single typical cassandra instance handle?
It seems like we are getting into trouble when one of our node's load
grows to bigger than 200g. Both read latency and write latency are increasing,
varying from 10 to several thousand milliseconds.
machine config is 16*cpu 32G RAM
Heap size is 10G
Any suggestion of tuning?
Or should I start considering adding more nodes when the data grows to
this big?
Thanks
