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： [email protected]
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:[email protected]]
发送时间: 2014年6月17日 11:41
收件人: [email protected]
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 <[email protected]>
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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