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From "Yi Yang"...@iyyang.com>
Subject Re: Cassandra JVM heap size
Date Tue, 04 Oct 2011 03:02:49 GMT
Someone has just talked about the heap size in this mail list, says that bigger heap size will
result into a longer GC phase, that could probably be one of the reason not using larger heap
size.

But I have really heard of some others using Cassandra with some 60 gigabytes of heap size.

從我的 BlackBerry® 無線裝置

-----Original Message-----
From: Ramesh Natarajan <ramesh25@gmail.com>
Date: Mon, 3 Oct 2011 21:47:08 
To: <user@cassandra.apache.org>
Reply-To: user@cassandra.apache.org
Subject: Cassandra JVM heap size

I was reading an article @
http://www.acunu.com/products/choosing-cassandra/and it mentions
cassandra cannot benefit from more than 8GB allocated to JVM
heap.  Is this true?  Are these cassandra installations with larger heap
sizes? We are planning to have a cluster of 6 nodes with each node running
with about 100 GB or so RAM. Will this be a problem?

thanks
Ramesh

from http://www.acunu.com/products/choosing-cassandra/

Memory Ceiling

Cassandra typically cannot benefit from more than 8GB of RAM allocated to
the Java heap, imposing a hard limit on data size. Taking advantage of big
servers with lots of memory or many disks is no problem for Acunu. Thereʼs
no memory ceiling for Acunu and as a result, no data ceiling either. Need to
use larger servers? Go ahead.

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