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From Jean-Marc Spaggiari <jean-m...@spaggiari.org>
Subject Re: How to make a given table spread evenly across the cluster
Date Fri, 03 Oct 2014 12:31:37 GMT
It depends on the time between the 2 screen-shots.  But if there is more
than 5 minutes (default config), then you are correct and it should have
been a minimum balanced.

2014-10-03 3:30 GMT-04:00 Qiang Tian <tianq01@gmail.com>:

> according to the 2 pictures, looks the balancer not run?
>
> On Fri, Oct 3, 2014 at 1:45 AM, Ted Yu <yuzhihong@gmail.com> wrote:
>
> > See also
> > HBASE-12139 StochasticLoadBalancer doesn't work on large lightly loaded
> > clusters
> >
> > Cheers
> >
> > On Thu, Oct 2, 2014 at 10:35 AM, Jean-Marc Spaggiari <
> > jean-marc@spaggiari.org> wrote:
> >
> > > Also, What is the balancer configured on your cluster? Which HBase
> > version?
> > > If you have a 200 region table in a cluster with another pretty small
> 13
> > > region table like the one you have, chances are high for this 2nd table
> > to
> > > not be perfectly balanced over the cluster compared to the first one.
> > >
> > > JM
> > >
> > > 2014-10-02 13:30 GMT-04:00 Nick Dimiduk <ndimiduk@gmail.com>:
> > >
> > > > Is the balancer running? If it's running but unable to act, you
> should
> > > see
> > > > some explanation in the Master logs.
> > > >
> > > > On Wed, Oct 1, 2014 at 8:27 PM, Tao Xiao <xiaotao.cs.nju@gmail.com>
> > > wrote:
> > > >
> > > > > Hi all,
> > > > >
> > > > > I have a HBase table containing 40 million records. Checking HBase
> > UI,
> > > I
> > > > > could see that this table was not spread evenly across the cluster.
> > Two
> > > > > nodes, *ec1.hadoop.com:60020 <http://ec1.hadoop.com:60020>*
and
> > > > > *ec5.hadoop.com:60020
> > > > > <http://ec5.hadoop.com:60020>*, for example, has only one region
> > each,
> > > > > while other nodes have more regions. Here is the screen shot
> > > > > <http://imgbin.org/index.php?page=image&id=19571>.
> > > > >
> > > > > I tried to split that table by clicking the button "Split". Later,
> > each
> > > > > region of that table was split into two regions, but all regions
> for
> > > that
> > > > > table as a whole were still unevenly spread across the cluster.
> Here
> > > > > is a screen
> > > > > shot after I click the button "Split"
> > > > > <http://imgbin.org/index.php?page=image&id=19572>.
> > > > >
> > > > > So I'd like to know how to adjust the regions for a table so that
> all
> > > > > regions for that table can be evenly spread across the cluster.
> > > > >
> > > > > Thanks
> > > > >
> > > >
> > >
> >
>

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