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From Nicolas Liochon <nkey...@gmail.com>
Subject Re: small perf degradation in 0.94 trunk vs. older versions
Date Tue, 27 Nov 2012 18:42:58 GMT
It was Version 0.94.3, r38dbd22c99debd9010e9e5f4fbabeeaf3c4e1ddd


On Tue, Nov 27, 2012 at 7:41 PM, lars hofhansl <lhofhansl@yahoo.com> wrote:

> Interesting. Thanks N.
>
> I'll look through the 0.94 commits since 0.94.1 to see what's causing this.
> With 0.94 trunk you mean the 0.94.3RC?
>
>
> -- Lars
>
>
>
> ________________________________
>  From: Nicolas Liochon <nkeywal@gmail.com>
> To: dev@hbase.apache.org
> Sent: Tuesday, November 27, 2012 5:07 AM
> Subject: small perf degradation in 0.94 trunk vs. older versions
>
> Hi,
>
> On a create table / reassignment, I feel we lost some performances recently
> on 0.94. It's not huge (5% to 10%), but I would prefer them to be the other
> way around.
> Here are some tests I've done on test cluster, all the time with Hadoop
> 1.1.0;
>
> scenario: 2 RS. Create a table with 3000 regions.
> Start a third RS. Kill -15 the second one: there are 1500 regions to
> reassign.
>
> I've made multiple measures, there are all there:
> It's in seconds.
>
> Creating a table with 3000 regions:
> 0.92: 261s; 260s
> 0.94.0: 260s; 260s
> 0.94.1: 261s; 260s
> 0.94 trunk: 292s; 281s; 282s;
> 0.96 trunk: 173s; 178s
>
> Reassign after the kill
> 0.92: 107s, 110s
> 0.94.0: 105s; 105s
> 0.94.1: 107s; 107s
> 0.94 trunk: 122s; 105s; 116s
> 0.96 trunk: 50s; 50s;
>
> I don't know if there is a reason the the 0.94 trunk results...
> The results for 0.96s are actually not that great, my tests (on a single
> machine) were much better a few months ago. I will look at that.
>
> Cheers,
>
> N.
>

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