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From 马超 <hossc...@gmail.com>
Subject Re: High latency of cassandra
Date Tue, 24 Apr 2012 10:11:26 GMT
Does any one have idea for this? Thanks~

2012/4/24 马超 <hosschao@gmail.com>

> Hi all,
>
> I have some troubles of cassandra in my production:
>
> I build up a RPC server which using hector client to manipulate the
> cassandra. Wired things happen nowadays: the latency of RPC sometimes
> becames very high (10seconds~70seconds) in several minutes and reduce
> to normal level (30ms in average) after that time. I investigate the
> debug log of cassandra. During high latency time, the cassandra output
> lots of message like:
> "IncomingTcpConnection.java(116) Version is now 3. "
> Seems everything be blocked during that time.
>
> Our settings as following:
> The version of cassandra is 1.0.1 and hector version is 0.7.0 for the
> compatible of thrift version which we use (0.5.0)
> The cluster contains 4 nodes and all of them are seeds. The
> gcgraceseconds is 0 since we needn't delete the data
>
> p.s. It works well for a long time (3 months) but becames crazy these
> days after we push the new RPC server which supports bigger data
> saving (2mb in average). I'm not sure if these is the reason.
>
> Hope getting your replay~~
>
> Thanks,
>
> Chao.
>

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