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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: Excessive allocation during hinted handoff
Date Thu, 12 May 2011 04:28:40 GMT
Doesn't really look abnormal to me for a heavy write load situation
which is what "receiving hints" is.

On Wed, May 11, 2011 at 1:55 PM, Gabriel Tataranu <gabriel@wajam.com> wrote:
> Greetings,
>
> I'm experiencing some issues with 2 nodes (out of more than 10). Right
> after startup (Listening for thrift clients...) the nodes will create
> objects at high rate using all available CPU cores:
>
>  INFO 18:13:15,350 GC for PS Scavenge: 292 ms, 494902976 reclaimed
> leaving 2024909864 used; max is 6658457600
>  INFO 18:13:20,393 GC for PS Scavenge: 252 ms, 478691280 reclaimed
> leaving 2184252600 used; max is 6658457600
> ....
>  INFO 18:15:23,909 GC for PS Scavenge: 283 ms, 452943472 reclaimed
> leaving 5523891120 used; max is 6658457600
>  INFO 18:15:24,912 GC for PS Scavenge: 273 ms, 466157568 reclaimed
> leaving 5594606128 used; max is 6658457600
>
> This will eventually trigger old-gen GC and then the process repeats
> until hinted handoff finishes.
>
> The build version was updated from 0.7.2 to 0.7.5 but the behavior was
> exactly the same.
>
> Thank you.
>
>



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com

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