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From 郭鹏 <gpcus...@gmail.com>
Subject Re: why Cassandra 0.5.1 write speed is very slow
Date Tue, 23 Mar 2010 03:20:13 GMT
The replication factor is One,
The consistency level also is One.

在 2010年3月23日 上午10:21,Benjamin Black <b@b3k.us>写道:

> Maybe I missed this: what replication factor and consistency level are
> you using?
>
> 2010/3/21 郭鹏 <gpcuster@gmail.com>:
> > Thx, I will try it in the multi-thread mode.
> >
> > What's the best practice in the production env?
> >
> >
> >
> > 在 2010年3月21日 下午12:04,Jonathan Ellis <jbellis@gmail.com>写道:
> >>
> >> If you're benchmarking throughput, then you absolutely have to be
> >> multithreaded.
> >>
> >> 2010/3/20 郭鹏 <gpcuster@gmail.com>:
> >> > You mean I waste lots of time waiting for the write reply?
> >> >
> >> > How could I avoid this problem? Using multi-thread for very write
> >> > operation?
> >> >
> >> > I am totally confused.
> >> >
> >> > Thx.
> >> >
> >> > 在 2010年3月21日 上午11:16,Jonathan Ellis <jbellis@gmail.com>写道:
> >> >>
> >> >> time a single-threaded client is spending waiting for a reply, is
> time
> >> >> it's not spending sending another request
> >> >>
> >> >> 2010/3/20 郭鹏 <gpcuster@gmail.com>:
> >> >> > Good ideal, I will try it with client multithread write.
> >> >> >
> >> >> > But I don't understand the meaning of "d the latency in cluster
> mode
> >> >> > hurts
> >> >> > that much more."
> >> >> >
> >> >> > Thx.
> >> >> >
> >> >> > 2010/3/21 Jonathan Ellis <jbellis@gmail.com>
> >> >> >>
> >> >> >> 2010/3/20 郭鹏 <gpcuster@gmail.com>:
> >> >> >> > :)
> >> >> >> >
> >> >> >> > I just want to know why the write speed is ok in the
standalone
> >> >> >> > mode
> >> >> >> > but
> >> >> >> > too
> >> >> >> > slow in the cluster mode.
> >> >> >> >
> >> >> >> > Am I doing something wrong?
> >> >> >>
> >> >> >> Probably, but it's hard to say what.
> >> >> >>
> >> >> >> Maybe you're just not using enough threads in your benchmark
and
> the
> >> >> >> latency in cluster mode hurts that much more.
> >> >> >
> >> >> >
> >> >> >
> >> >> > --
> >> >> > Regards
> >> >> >    Peng Guo
> >> >> >
> >> >
> >> >
> >> >
> >> > --
> >> > Regards
> >> >    Peng Guo
> >> >
> >
> >
> >
> > --
> > Regards
> >    Peng Guo
> >
>



-- 
Regards
   Peng Guo

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