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Posted to user@cassandra.apache.org by Nikolay Kоvshov <nk...@yandex.ru> on 2012/08/01 10:01:59 UTC
Re: Cassandra 1.0 hangs during GC
And the final solution
http://unbxd.com/blog/2012/07/java-and-ksoftirqd-100-cpu-due-to-leap-second/
Doing $ date -s "`date`" solved the problem.
30.07.2012, 16:09, "Nikolay Kоvshov" <nk...@yandex.ru>:
> You mean using swap memory? I have total of 48G of RAM and Cassandra never used more than 2G, swap is disabled.
>
> But as I have little clues, I can give this a try. Is there any fresh instruction on running Cassandra with JNA ?
>
> 30.07.2012, 16:01, "Mateusz Korniak" <ma...@ant.gliwice.pl>:
>> On Monday 30 of July 2012, Nikolay Kоvshov wrote:
>>> - JNA is not installed on both machines
>> So your GC times may be strongly [1] affected by swapping.
>> IIRC, also snapshotting is more expensive and may trigger more swapping.
>> I would start with turning JNA mlockall on [2].
>>
>> [1]:
>> Not sure if up to numbers you presented ( many seconds)...
>>
>> [2]:
>> INFO [main] 2012-07-27 12:18:27,135 CLibrary.java (line 109) JNA mlockall
>> successful
>>
>> --
>> Mateusz Korniak