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From Terje Marthinussen <tmarthinus...@gmail.com>
Subject Re: Excessive allocation during hinted handoff
Date Thu, 12 May 2011 09:10:52 GMT
Just out of curiosity is this on the receiver or sender side?

I have been wondering a bit if the hint playback could need some
adjustment.
There is potentially quite big differences on how much is sent per throttle
delay time depending on what your data looks like.

Early 0.7 releases also built up hints very easily under load due to nodes
quickly getting marked as down due to gossip sharing the same thread as many
other operations.

Terje

On Thu, May 12, 2011 at 1:28 PM, Jonathan Ellis <jbellis@gmail.com> wrote:

> 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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