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From aaron morton <aa...@thelastpickle.com>
Subject Re: CMS GC initial-mark taking 6 seconds , bad?
Date Sun, 25 Sep 2011 09:37:06 GMT
It does seem long and will be felt by your application. 

Are you running a 47GB heap ? Most peeps seem to think 8 to 12 is about the viable maximum.


Cheers
 
-----------------
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com

On 25/09/2011, at 7:14 PM, Yang wrote:

> I see the following in my GC log
> 
> 1910.513: [GC [1 CMS-initial-mark: 2598619K(26214400K)]
> 13749939K(49807360K), 6.0696680 secs] [Times: user=6.10 sys=0.00,
> real=6.07 secs]
> 
> so there is a stop-the-world period of 6 seconds. does this sound bad
> ? or 6 seconds is OK  and we should expect the built-in
> fault-tolerance of Cassandra handle this?
> 
> Thanks
> Yang


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