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From "sunweiwei" <su...@asiainfo-linkage.com>
Subject 答复: regions not balance?
Date Wed, 18 Jun 2014 00:49:35 GMT
Thanks all

-----邮件原件-----
发件人: Jean-Marc Spaggiari [mailto:jean-marc@spaggiari.org] 
发送时间: 2014年6月17日 19:25
收件人: user
主题: Re: regions not balance?

Also, you can set it to TRACE logs from the WebUI. That will help you to
see the logic displayed on the logs...

JM


2014-06-17 1:23 GMT-04:00 duanp <duanp@neusoft.com>:

>
> I think that the balancer may not need to be executed. you can calculate
> the value with parameters you set.
>
> before, i have the same question as yours .
>
>     In the 0.96 , org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer
> has a method BaseLoadBalancer.needsBalance determine it .
>
>
>
>     protected boolean needsBalance(ClusterLoadState cs) {
>     if (cs.getNumServers() < MIN_SERVER_BALANCE) {
>       if (LOG.isDebugEnabled()) {
>         LOG.debug("Not running balancer because only " + cs.getNumServers()
>             + " active regionserver(s)");
>       }
>       return false;
>     }
>     // Check if we even need to do any load balancing
>     // HBASE-3681 check sloppiness first
>     float average = cs.getLoadAverage(); // for logging numRegions /
> numServers;
>     int floor = (int) Math.floor(average * (1 - slop)); //
> hbase.regions.slop, default 0.2
>     int ceiling = (int) Math.ceil(average * (1 + slop));
>     if (!(cs.getMaxLoad() > ceiling || cs.getMinLoad() < floor)) { //
>       NavigableMap<ServerAndLoad, List<HRegionInfo>> serversByLoad =
> cs.getServersByLoad();
>       if (LOG.isTraceEnabled()) {
>         // If nothing to balance, then don't say anything unless
> trace-level logging.
>         LOG.trace("Skipping load balancing because balanced cluster; " +
>           "servers=" + cs.getNumServers() + " " +
>           "regions=" + cs.getNumRegions() + " average=" + average + " " +
>           "mostloaded=" + serversByLoad.lastKey().getLoad() +
>           " leastloaded=" + serversByLoad.firstKey().getLoad());
>       }
>       return false;
>     }
>     return true;
>   }
>
>
>
> 发件人: sunweiwei
> 发送时间: 2014-06-17 12:55
> 收件人: user@hbase.apache.org
> 主题: 答复: regions not balance?
> I'm using hbase0.96.
> There is no balancer related logs in master log at that moment.
> I find Regions-in-transition is empty in web UI's debug dump.
>
> Thanks
>
>
> -----邮件原件-----
> 发件人: Ted Yu [mailto:yuzhihong@gmail.com]
> 发送时间: 2014年6月17日 11:41
> 收件人: user@hbase.apache.org
> 主题: Re: regions not balance?
>
> bq. and return true, but It not works
>
> Looking at master log, do you see balancer related logs around this time ?
> If there was region in transition at this moment, balancer wouldn't perform
> balancing.
>
> What version of HBase are you using ?
>
> Cheers
>
>
> On Mon, Jun 16, 2014 at 8:19 PM, sunweiwei <sunww@asiainfo-linkage.com>
> wrote:
>
> > Hi
> >
> >     I have several regionservers. One regionserver has 434 regions and
> > other
> > regionservers only have about 300+ regions.
> >
> >     I think it's not balance. Then I run balancer command in hbase shell
> > and return true, but It not works.
> >
> >     The  regionserver always has 400+ regions.  Is this normal?
> >
> >
> >
> > Thanks
> >
> >
>
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