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From "Bill Havanki" <bhava...@clouderagovt.com>
Subject Re: Review Request 19352: ACCUMULO-2488 - refined balance check for concurrent randomwalk
Date Tue, 18 Mar 2014 20:16:17 GMT


> On March 18, 2014, 1:29 p.m., kturner wrote:
> > src/server/src/main/java/org/apache/accumulo/server/test/randomwalk/concurrent/CheckBalance.java,
line 100
> > <https://reviews.apache.org/r/19352/diff/2/?file=526277#file526277line100>
> >
> >     could use o.a.a.core.util.Stat
> 
> Bill Havanki wrote:
>     I just looked at Stat. I don't think it calculates standard deviation correctly,
actually.

For future reference: See ACCUMULO-2494 for discussion. The calculation in Stat is OK but
not great. I'll leave this one as is.


- Bill


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https://reviews.apache.org/r/19352/#review37568
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On March 18, 2014, 2:43 p.m., Bill Havanki wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/19352/
> -----------------------------------------------------------
> 
> (Updated March 18, 2014, 2:43 p.m.)
> 
> 
> Review request for accumulo and Mike Drob.
> 
> 
> Bugs: ACCUMULO-2488
>     https://issues.apache.org/jira/browse/ACCUMULO-2488
> 
> 
> Repository: accumulo
> 
> 
> Description
> -------
> 
> The Concurrent randomwalk test used to consider servers unbalanced if any server's tablet
count differed from the cluster average by more than a fifth of the average or by one, whichever
was larger. This would cause failures under typical balancings from the default balancer.
> 
> This commit changes the criterion for an unbalanced server to be double the standard
deviation from the cluster average.
> 
> 
> Diffs
> -----
> 
>   src/server/src/main/java/org/apache/accumulo/server/test/randomwalk/concurrent/CheckBalance.java
d00e2b4 
> 
> Diff: https://reviews.apache.org/r/19352/diff/
> 
> 
> Testing
> -------
> 
> Ran Concurrent randomwalk three times on 7-node cluster.
> 
> 
> Thanks,
> 
> Bill Havanki
> 
>


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