hbase-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "stack (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-920) Make region balancing sloppier
Date Tue, 14 Oct 2008 17:45:44 GMT

     [ https://issues.apache.org/jira/browse/HBASE-920?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HBASE-920:
------------------------

    Fix Version/s: 0.18.1

Moving into 0.18.1

> Make region balancing sloppier
> ------------------------------
>
>                 Key: HBASE-920
>                 URL: https://issues.apache.org/jira/browse/HBASE-920
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: stack
>            Assignee: stack
>             Fix For: 0.18.1
>
>
> The region load balancer is exacting.  Here's the logic:
> {code}
>         if (avgLoad > 2.0 && thisServersLoad.getNumberOfRegions() > avgLoad)
{
>           if (LOG.isDebugEnabled()) {
>             LOG.debug("Server " + serverName + " is overloaded. Server load: " +
>               thisServersLoad.getNumberOfRegions() + " avg: " + avgLoad);
>           }
> ...
> {code}
> On a cluster of thousands of regions, especially around startup or if there's been a
crash, the above makes for a bunch of churn as load balancer closes and opens nodes to achieve
an exact balance (all nodes must be <= to average).
> I'd suggest that nodes should be left alone if they are within some percentage of the
average -- say 10% (should be configurable).

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message