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From mcasandra <>
Subject Re: Timeout during stress test
Date Tue, 12 Apr 2011 05:11:40 GMT

aaron morton wrote:
> You'll need to provide more information, from the TP stats the read stage
> could not keep up. If the node is not CPU bound then it is probably IO
> bound. 
> What sort of read?
> How many columns was it asking for ? 
> How many columns do the rows have ?
> Was the test asking for different rows ?
> How many ops requests per second did it get up to?
> What do the io stats look like ? 
> What does nodetool cfhistograms say ?
It's simple read of 1M rows with one column of avg size of 200K. Got around
70 req per sec.

Not sure how to intepret the iostats output with things happening async in
cassandra. Can you give little description on how to interpret it?

I have posted output of cfstats. Does cfhistograms provide better info?

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