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From aaron morton <>
Subject Re: Nodes frozen in GC
Date Sun, 06 Mar 2011 03:27:52 GMT
Your node is under memory pressure, after the GC there is still 5.7GB in use. In fact it looks
like memory usage went up during the GC process. 

Can you reduce the memtable size, caches or the number of CF's or increase the JVM size? Also
is this happening under heavy load ? 


On 6/03/2011, at 10:34 AM, ruslan usifov wrote:

> Hello
> I have cluster of 3 cassandra 0.7.3 nodes, and some times nodes a frozen. As i understand
this because GC, in this moment i see 
> INFO [ScheduledTasks:1] 2011-03-05 15:21:23,524 (line 128) GC for ConcurrentMarkSweep:
18052 ms, -997761672 reclaimed leaving 5796586088
> How can i reduce this? I installed JNA (i install it correctly: " (line
106) JNA mlockall successful" log record  in system.log present on all nodes), and set vm.swappiness
= 0, but this doesn't help. Any suggest?
> PS: Nodes have 12GB of memory with 6GB HeapSize

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