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From Stack <st...@duboce.net>
Subject Re: write performance degradation
Date Sun, 30 Jan 2011 22:34:14 GMT
On Sun, Jan 30, 2011 at 3:41 PM, Ted Yu <yuzhihong@gmail.com> wrote:
> Using 0.90 RC3 on our 7 node clsuter, the first time (after cluster start)
> our map tasks ran quite fast writing to hbase (client side buffer size being
> 17MB).
>

Can you come up on release 0.90.0 Ted?

17MB client buffer might be a little large.


> If I run the same hadoop job soon after the first finishes, there is
> noticeable slow down.
>

What do you see in your ganglia?  Anything else running on cluster at
the time?  What are the machines doing?  CPU, iowait?  Swapping?

Thanks,
St.Ack

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